物理最新文献

{"title":"Monte Carlo simulation of polymer phantoms in proton therapy for eye tumor treatment","authors":"Engin Aşlar,&nbsp;Fatih Ekinci","doi":"10.1140/epjp/s13360-024-05944-z","DOIUrl":"10.1140/epjp/s13360-024-05944-z","url":null,"abstract":"<div><p>Traditional methods for treating eye tumors, such as surgery and radiation therapy, can cause damage to surrounding healthy tissues and unwanted side effects. In recent years, proton therapy has emerged as a significant alternative for the treatment of eye tumors. Proton therapy targets cancer cells using proton particles while minimizing damage to the surrounding healthy tissues. Unlike other radiation therapy techniques, proton therapy uses the Bragg peak, which allows protons to concentrate on a specific depth within the tissue. Proton therapy can deliver a high dose of radiation to the tumor area while protecting nearby healthy tissues. Additionally, proton therapy has a more favorable side effect profile than other treatment methods. This study focuses on simulations conducted on eyes and eye phantoms to examine the effects of proton therapy on eye tissues. The simulations analyzed physical effects such as ionization, recoils, and lateral straggle of proton beams using Bragg curves, recoil analyses, and atomic-level interactions. Results indicate that as the energy levels of proton beams increase, the range and energy transfer in eye tissues also increase. These findings emphasize the potential effectiveness of proton therapy for treating eye tumors. Polymer eye phantoms can serve as reliable tools in proton therapy simulations to optimize treatment planning. This study highlights the importance of proton therapy simulations and demonstrates the successful use of various polymer materials. Future studies may also examine the effects of heavy particles in addition to different polymer materials to comprehensively evaluate the impact of proton beams in biomedical applications.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 1","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjp/s13360-024-05944-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142976649","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Gravitational wave luminosity distance for Starobinsky gravity in viscous cosmological models","authors":"Jia-nan Chi,&nbsp;Ya-Bo Wu,&nbsp;Yu Sang,&nbsp;Xue Zhang,&nbsp;Yi-liang Hu,&nbsp;Wen-zhong Liu,&nbsp;Bo-hai Chen","doi":"10.1140/epjc/s10052-024-13564-1","DOIUrl":"10.1140/epjc/s10052-024-13564-1","url":null,"abstract":"&lt;div&gt;&lt;p&gt;In this paper, in the Starobinsky gravity (SG) model, the gravitational wave (GW) luminosity distance &lt;span&gt;(d_L^{GW}(z))&lt;/span&gt; is analytically and numerically investigated by considering the dark matter as the two different kinds of shear viscous fluids in universe. Concretely, on the basis of the propagation equation of the metric perturbation derived by using transverse-traceless gauge for the linear perturbation of the metric in FRW background, we obtain the analytical expressions of the modified friction term &lt;span&gt;(delta (z))&lt;/span&gt; and the ratio &lt;span&gt;(d_L^{GW}(z)/d_L^{EM}(z))&lt;/span&gt; of GW to electromagnetic (EM) wave luminosity distance, and find that they only depend on the SG model parameter &lt;span&gt;(alpha )&lt;/span&gt; and the shear viscous coefficient &lt;span&gt;(eta )&lt;/span&gt;, regardless of the bulk viscous coefficient &lt;span&gt;(zeta )&lt;/span&gt;. Evidently, both of them are affected by &lt;span&gt;(alpha )&lt;/span&gt; and &lt;span&gt;(eta )&lt;/span&gt;. It worth stressing that the results given by us can reduce to ones in documents [13, 22, 30]. It follows that we can extend the previous results as the special cases in our model. Furthermore, by combining the latest observational data, we more tightly constrain the values of related parameters and numerically analyze the influence of both &lt;span&gt;(alpha )&lt;/span&gt; and &lt;span&gt;(eta )&lt;/span&gt; on &lt;span&gt;(delta (z))&lt;/span&gt; and &lt;span&gt;(d_L^{GW}(z)/d_L^{EM}(z))&lt;/span&gt;. We observe that, in the range of &lt;span&gt;(0&lt; zle 8.2)&lt;/span&gt;, the evolutionary curves of &lt;span&gt;(delta (z))&lt;/span&gt; and &lt;span&gt;(d_L^{GW}(z)/d_L^{EM}(z))&lt;/span&gt; exhibit that &lt;span&gt;(delta (z))&lt;/span&gt; (&lt;span&gt;(d_L^{GW}(z)/d_L^{EM}(z))&lt;/span&gt;) monotonically decrease (increase) as redshift rises, moreover there are always &lt;span&gt;(delta (z)&lt;0)&lt;/span&gt; and &lt;span&gt;(d_L^{GW}(z)ge d_L^{EM}(z))&lt;/span&gt;, specially &lt;span&gt;(d_L^{GW}(0)=d_L^{EM}(0))&lt;/span&gt; in the limit of &lt;span&gt;(zrightarrow 0)&lt;/span&gt;, which means that detecting GW signals might represent a more efficient tool than detecting EM signals to test modified gravity model on the given scale of cosmic distances. It is worth noting that the numerical analyses to &lt;span&gt;(delta (z))&lt;/span&gt; and &lt;span&gt;(d_L^{GW}(z)/d_L^{EM}(z))&lt;/span&gt; illustrate once again that the GW luminosity distance &lt;span&gt;(d_L^{GW}(z))&lt;/span&gt; is indeed influenced by &lt;span&gt;(alpha )&lt;/span&gt; and &lt;span&gt;(eta )&lt;/span&gt;, in particular more sensitive to &lt;span&gt;(alpha )&lt;/span&gt; than &lt;span&gt;(eta )&lt;/span&gt; in our model. In addition, by comparing the GW and EM luminosity distances of SG model with &lt;span&gt;(d_{L(GR)})&lt;/span&gt; of Einstein GR, we find that the GW and EM signals in SG1 and SG2 change from stronger to weaker than the ones in GR as redshift increases and more difficultly to be detected in the same distance and detection sensitivity. Meanwhile, the EM signals change from strong to weak earlier than GW signals do. Finally, we confirm that &lt;span&gt;(delta (z))&lt;/span&gt; and &lt;span&gt;(d_L^{GW}(z))&lt;/span&gt; of our model meet the constraints imposed by the standard siren GW170817 and its","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 1","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-024-13564-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994370","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on the coupling and ion acceleration between ultraintense laser and multilayer solid targets","authors":"Chong Lv,&nbsp;Jialun Chai,&nbsp;Xiaona Ban,&nbsp;Wei Sun","doi":"10.1140/epjd/s10053-024-00950-3","DOIUrl":"10.1140/epjd/s10053-024-00950-3","url":null,"abstract":"<p>This study focuses on optimizing beam driving modes to enhance laser-target coupling efficiency and improve particle quality in laser-driven ion acceleration. The aim is to increase proton and ion beam energy. Two-dimensional particle-in-cell simulations are conducted to investigate the proton beam generated by a Petawatt laser-driven multilayer target. The results indicate that optimal space overlap between the laser and targets improves energy coupling efficiency. Numerical simulation results indicate that the overlap of two laser pulses in front of the target, specifically at the same focal point, results in the generation of higher-energy ion beams. This result is primarily attributed to the enhanced longitudinal electric field under such conditions, which leads to increased energies of protons and ions. By adjusting the longitudinal size of the CH layer, a high-quality proton beam with a maximum cut-off energy of approximately 290 MeV and a small energy spread of 5.2<span>(%)</span> and 14.7<span>(%)</span> is achieved</p>","PeriodicalId":789,"journal":{"name":"The European Physical Journal D","volume":"79 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994547","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"DFT + U study of chromium-doped europium oxide: insights into half-metallic behavior and stability","authors":"Khadidja Mokaddem,&nbsp;Djillali Bensaid,&nbsp;Bendouma Doumi,&nbsp;Allel Mokaddem,&nbsp;Kaddour Bencherif","doi":"10.1140/epjb/s10051-024-00850-w","DOIUrl":"10.1140/epjb/s10051-024-00850-w","url":null,"abstract":"<div><p>The objective of this work is to apply density functional theory (DFT) with the inclusion of the Coulomb interaction (Hubbard U) to elements that possess d and f orbitals to explore the half-metallic properties of Europium oxide doped with Chromium. The formation energy recommends that these compounds (<span>({text{Eu}}_{1-text{x}}{text{Cr}}_{text{x}}text{O})</span>) are thermodynamically stable and our findings confirm that the introduction of Chromium (Cr) into the Europium Oxide (EuO) host matrix results in the emergence of a band gap in the minority spin channel, validating the half-metallic nature of our materials. Integer Bohr magneton values for total magnetizations confirm the half-metallic ferromagnetic behavior. The value of the half-metallic gap decreases when the concentration is increased. Remarkable results were observed on the EuO compound with the inclusion of Cr d content. The system undergoes a double-exchange mechanism which stabilizes ferromagnetic state. The estimated Curie temperature closely aligns with ambient conditions for concentrations of both 0.25 and 0.75, while reaching 169 K for a concentration of 0.5. These findings motivate further exploration into different concentrations and alternative dopant ions.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142976480","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Multi-dimensional q-Gaussian densities describing systems of confined interacting particles with drag","authors":"S. Curilef,&nbsp;A. R. Plastino,&nbsp;E. M. F. Curado","doi":"10.1140/epjp/s13360-025-05993-y","DOIUrl":"10.1140/epjp/s13360-025-05993-y","url":null,"abstract":"<div><p>Fokker–Planck equations with power-law nonlinearities in the diffusion term are useful for the description of various complex systems in physics and other disciplines. These evolution equations provide an effective representation of overdamped systems of particles interacting through short-range forces and confined by an external potential. It has been recently shown that the nonlinear Fokker–Planck equation admits an embedding within a Vlasov-like mean-field equation that allows to incorporate inertial effects to the associated dynamics. Exact time-dependent solutions of the <i>q</i>-Gaussian form (with compact support) of the Vlasov-like equation have been found for one-dimensional systems with quadratic confining potentials. In the present contribution, we explore the possibility of extending this type of solutions to multi-dimensional systems with <i>N</i> spatial dimensions. We found exact time-dependent <i>q</i>-Gaussian solutions in <span>(N=2)</span> and <span>(N=3)</span>, and investigate their main properties. We also prove that this type of solutions does not exist in systems with spatial dimension <span>(N&gt;3)</span>.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 1","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142976650","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Theoretical study of geometry and electronic properties of medium-sized doped clusters KBn (n = 2 − 12)","authors":"DeHui Zhou,&nbsp;YanFei Hu,&nbsp;TengXin Huang,&nbsp;Qian Wang,&nbsp;ZhiWei Tan,&nbsp;YuQuan Yuan,&nbsp;HanZhe Qin","doi":"10.1140/epjp/s13360-025-05992-z","DOIUrl":"10.1140/epjp/s13360-025-05992-z","url":null,"abstract":"<div><p>In this study, we employed the CALYPSO software in conjunction with DFT calculations to investigate KB_n (n = 2 − 12) clusters and determine their ground state structures. Through structural and stability analyses, we elucidated the structural evolution patterns of KB_n (n = 2 − 12) clusters; notably, we identified two clusters, KB₇ and KB₉, which exhibit similar structures characterized by planar molecular wheel configurations of the boron framework, albeit with differences in stability. Additionally, charge transfer analysis of each ground state structure revealed that the position of the doped K atom significantly influences the bonding characteristics within the cluster. Further examination of the bonding characteristics of the KB₇ and KB₉ clusters showed substantial contributions from the B-2s, B-2p, K-4s, and K-5s orbitals. In both KB₇ and KB₉ clusters, there is a strong interaction between K and B atoms, leading to the formation of robust K–B and B–B covalent bonds. Ultimately, the interaction region indicator method indicates that, in the KB₇ and KB₉ clusters, there are not only chemical bonds between B atoms, but also significant weak interactions.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 1","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142976651","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Direct measurement of the 19F(p,(alpha ))16O reaction using the LHASA detector array","authors":"T. Petruse,&nbsp;G. L. Guardo,&nbsp;D. Lattuada,&nbsp;M. La Cognata,&nbsp;D. L. Balabanski,&nbsp;E. Aciksoz,&nbsp;L. Acosta,&nbsp;L. Capponi,&nbsp;D. Carbone,&nbsp;S. Cherubini,&nbsp;D. Choudhury,&nbsp;G. D’Agata,&nbsp;A. Di Pietro,&nbsp;P. Figuera,&nbsp;M. Gulino,&nbsp;A. I. Kilik,&nbsp;M. La Commara,&nbsp;L. Lamia,&nbsp;C. Matei,&nbsp;S. Palmerini,&nbsp;R. G. Pizzone,&nbsp;S. Romano,&nbsp;P.-A. Söderström,&nbsp;R. Sparta,&nbsp;A. Tumino,&nbsp;S. Viñals","doi":"10.1140/epja/s10050-024-01462-9","DOIUrl":"10.1140/epja/s10050-024-01462-9","url":null,"abstract":"<div><p>The low-energy ¹⁹F(p,<span>(alpha )</span>)¹⁶O reaction has significant implications for nuclear astrophysics. The ¹⁹F(p, <span>(alpha )</span>)¹⁶O reaction occurs via three channels: (p,<span>(alpha _0)</span>), (p,<span>(alpha _pi )</span>), and (p,<span>(alpha _gamma )</span>). At lower temperatures, below 0.15 GK, the (p,<span>(alpha _0)</span>) channel is the dominant contributor of the reaction. The ¹⁹F(p,<span>(alpha _{0})</span>)¹⁶O reaction cross section in the energy range of 400–900 keV was studied in this work. Recent data in the literature reveals a roughly 1.4 increase compared to prior findings reported in the NACRE (Nuclear Astrophysics Compilation of REactions) compilation. Therefore, we present new additional result of the study published in EPJA [22] employing a silicon strip detector array (LHASA - Large High-resolution Array of Silicon for Astrophysics). The anguar distributions, the reaction cross sections and the astrophysical <i>S-factors</i> of the (p,<span>(alpha _0)</span>) channel were obtained through this experiment. Our findings resolve the discrepancies that exist between the two previously available data sets in the literature.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epja/s10050-024-01462-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142976584","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Emulating cyclone Roanus interaction with tide and surge through the method of lines: a numerical analysis","authors":"Mohammad Wahiduzzaman,&nbsp;Gour Chandra Paul","doi":"10.1140/epjp/s13360-025-05971-4","DOIUrl":"10.1140/epjp/s13360-025-05971-4","url":null,"abstract":"<div><p>The shallow water equations were developed to predict changes in water levels resulting from the nonlinear tide-surge interaction associated with cyclonic storm Roanu, which impacted the east coast of Bangladesh. To solve these equations, the numerical method of lines was used in coordination with the Runge–Kutta (4,4) technique. A five-point central difference approximation was employed to discretize the spatial partial derivatives of the shallow water equations, resulting in a system of ordinary differential equations in time, which were then solved using the Runge–Kutta (4,4) method. The stair-step approach was utilized to model the land-sea interface, capturing key coastal features, including land and river dynamics, with special emphasis on the Meghna River’s freshwater runoff. To simulate tidal cycles and achieve stable tidal conditions, tidal forcing was applied along the southern open boundary of the model using four major tidal constituents: <span>({M}_{2})</span> (principal lunar semidiurnal), <span>({S}_{2})</span> (principal solar semidiurnal), <span>({K}_{1})</span> (lunisolar diurnal), and <span>({O}_{1})</span> (principal lunar diurnal) along the southern open boundary of the model. The simulated water levels due to the nonlinear tide-surge interaction closely matched observations from the Bangladesh Inland Water Transport Authority and were deemed reliable based on the root mean square error values.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 1","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142976599","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mechanical properties of (Ba0.4Sr0.4Ca0.2Fe12O19)x/(Bi1.6, Pb0.4)-2223 composite impacted in seawater","authors":"M. Matar,&nbsp;Ahmad Najem,&nbsp;K. Habanjar,&nbsp;M. Anas,&nbsp;R. Awad","doi":"10.1007/s00339-024-08196-x","DOIUrl":"10.1007/s00339-024-08196-x","url":null,"abstract":"<div><p>In the present work, the effect of adding Ba_0.4Sr_0.4Ca_0.2Fe₁₂O₁₉ hard nanoparticles and the immersion in seawater for different durations (0, 2, 6, 12, and 24 h) on the mechanical characteristics of the Bi, Pb-2223 superconductor phase were studied. A conventional solid-state reaction method was used to produce the (Ba_0.4Sr_0.4Ca_0.2Fe₁₂O₁₉)_<i>x</i>/(Bi_1.6, Pb_0.4)-2223 composites (0.00 ≤ <i>x</i> &lt; 0.40 wt%). X-ray diffraction (XRD) confirmed the primary phase formation of the tetragonal (Bi_1.6, Pb_0.4)-2223. Scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX) studies were also carried out to demonstrate the microstructural analyses of the samples during seawater immersion. Compared to the pure (Bi_1.6, Pb_0.4)-2223 phase, SEM and EDX verified the improvement of the adsorption of seawater elements upon adding the nanoparticles. This resulted in faster grain size reduction in the (Bi_1.6, Pb_0.4)-2223 phase than in the pure sample before immersion. Vickers microhardness (<span>(:Hv)</span>) Measurements were performed for 30 s at room temperature, with applied stresses ranging from 0.49 to 9.80 N after immersion in the seawater for different durations (0, 2, 6, 12, and 24 h). For the sample with <i>x</i> = 0.04 wt%, <span>(:Hv)</span> values enhanced with percentages of 67.72% and 98.44%, before and after immersion in seawater for 24 h, respectively. This suggests that the mechanical properties of the (Bi_1.6, Pb_0.4)-2223 phase were enhanced by a small addition of these nanoparticles and the salts of seawater adsorbed on the sample’s surface. The modified proportional sample resistance (MPSR) model offered the most accurate theoretical analysis in the plateau limit region, before and after seawater immersions, with a less than 5% variance. Furthermore, the incorporation of Ba_0.4Sr_0.4Ca_0.2Fe₁₂O₁₉ into the superconductor had a positive impact on several mechanical characteristics, including fracture toughness (K), yield strength (Y), and elastic modulus (E). All these mechanical parameter values followed the same trend, increasing with the increase in immersion time. However, they are at their height with the presence of 0.04 wt% of these nanoparticles. The toughness increased by 27.31% of the pure sample at this point. After that, when the immersion time rose from 0 to 24 h, this number increased by 42.59%.</p></div>","PeriodicalId":473,"journal":{"name":"Applied Physics A","volume":"131 2","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00339-024-08196-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142976605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Defect induces room temperature ferromagnetism and half-metallicity in Zr2CO2 MXene: Ab-initio calculations","authors":"Altaf Ur Rahman,&nbsp;Arslan Ahmad,&nbsp;Mohamed H. Helal,&nbsp;Mahmoud M. Hessien,&nbsp;Gul Rahman,&nbsp;Sergio Garcia Magalhaes","doi":"10.1140/epjp/s13360-025-05975-0","DOIUrl":"10.1140/epjp/s13360-025-05975-0","url":null,"abstract":"<div><p>Recently, substitutional doping in two-dimensional (2D) materials is demonstrated via chemical vapor deposition (CVD), opening a new strategy for designing and constructing novel ferromagnetic materials. Substitutional doping of Cr doping at possible dopant sites in Zr₂CO₂ monolayer is systematically studied using ab-initio calculations. It is found that Cr prefers Zr-site with suitable bond length and apparent charge transfer to host material, which is also supported by the lowest negative formation energy. In all studied cases, Cr atoms form strong bond to the Zr₂CO₂ crystal, a possible signature magnetization in non-magnetic Zr₂CO₂ monolayer. Ferromagnetic (FM) and anti-ferromagnetic (AFM) coupling calculations disclose that Cr doped at the Zr-site has a FM ground state. Moreover, using the mean-field theory (MFT) and Quantum Monte-Carlo (QMC) simulations, the transition temperature is calculated to be 184.76 K and 411 K, respectively. Our findings predict possible room temperature ferromagnetism in Cr-doped 2D MXene materials for possible spintronics device applications.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 1","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142976448","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}