The European Physical Journal B最新文献

{"title":"Structural and electronic properties of CaTiO3 polymorphs and 2D-derived systems: a theoretical investigation","authors":"Marta Loletti,&nbsp;Costanza Borghesi,&nbsp;Riccardo Rurali,&nbsp;Giacomo Giorgi","doi":"10.1140/epjb/s10051-025-00918-1","DOIUrl":"10.1140/epjb/s10051-025-00918-1","url":null,"abstract":"<p>Oxide perovskite materials exhibit intriguing optical and electrical properties that are widely exploited in ceramics and optoelectronic devices. With particular emphasis on its application for photocatalysis, this study aims to theoretically characterize the structural and electronic features of CaTiO₃, both as a stand-alone material and as a possible component in heterostructures. By means of a campaign of <i>ab-initio</i> calculations, we have revised the polymorphic nature of the material through an extensive analysis of its structural and electronic properties. Although standard DFT clearly confirms its intrinsic underestimation in predicting the excited state properties, by applying the recently introduced DFT<span>(-frac{1}{2})</span> method to the bandgap and dispersion calculations, we find very good agreement with experimental reported data. Finally, we include the investigation of dimensionally reduced CaTiO₃-based surfaces and nanosheets, opening the way to interesting possibilities for additional novel supports and photocatalysts with unique features.</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 4","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjb/s10051-025-00918-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143877716","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Is directed percolation class for synchronization transition robust with multi-site interactions?","authors":"Manoj C. Warambhe,&nbsp;Prashant M. Gade","doi":"10.1140/epjb/s10051-025-00928-z","DOIUrl":"10.1140/epjb/s10051-025-00928-z","url":null,"abstract":"<p>Coupled map lattice with pairwise local interactions is a well-studied system. However, in several situations, such as neuronal or social networks, multi-site interactions are possible. In this work, we study the coupled Gauss map in one dimension with 2-site, 3-site, 4-site and 5-site interaction. This coupling cannot be decomposed in pairwise interactions. We coarse-grain the variable values by labeling the sites above <span>(x^{star })</span> as up spin (+ 1) and the rest as down spin (– 1) where <span>(x^{star })</span> is the fixed point. We define flip rate <i>F</i>(<i>t</i>) as the fraction of sites <i>i</i> such that <span>(s_{i}(t-1) ne s_{i}(t))</span> and persistence <i>P</i>(<i>t</i>) as the fraction of sites <i>i</i> such that <span>(s_{i}(t')=s_{i}(0))</span> for all <span>(t' le t)</span>. The dynamic phase transitions to a synchronized state is studied above quantifiers. For 3 and 5 sites interaction, we find that at the critical point, <span>(F(t) sim t^{-delta })</span> with <span>(delta =0.159)</span> and <span>(P(t) sim t^{-theta })</span> with <span>(theta =1.5)</span>. They match the directed percolation (DP) class. Finite-size and off-critical scaling is consistent with DP class. For 2 and 4 site interactions, the exponent <span>(delta )</span> and behavior of <i>P</i>(<i>t</i>) at critical point changes. Furthermore, we observe logarithmic oscillations over and above power-law decay at the critical point for 4-site coupling. Thus multi-site interactions can lead to new universality class(es).</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 4","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143875304","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":"High critical current densities of body-centered cubic high-entropy alloy superconductors: recent research progress","authors":"Jiro Kitagawa,&nbsp;Yoshikazu Mizuguchi,&nbsp;Terukazu Nishizaki","doi":"10.1140/epjb/s10051-025-00922-5","DOIUrl":"10.1140/epjb/s10051-025-00922-5","url":null,"abstract":"<p>High-entropy alloy (HEA) superconductors have garnered significant attention due to their unique characteristics, such as robust superconductivity under extremely high pressure and irradiation, the cocktail effect, and the enhancement of the upper critical field. A high critical current density is another noteworthy feature observed in HEAs. Several body-centered cubic (bcc) HEAs have exhibited critical current densities comparable to those of Nb–Ti superconducting alloys. Such HEAs hold potential for applications as multifunctional superconducting wires, a capability rarely achieved in conventional alloys. In this context, we review recent advancements in research on critical current densities in bcc HEA superconductors, including <img>, <img>, NbScTiZr, and others. Comparative analyses among these HEAs reveal that both eutectic microstructures, which accompany lattice strain, and nano-sized precipitates play pivotal roles in achieving elevated critical current densities across wide magnetic field ranges. Furthermore, we propose several future directions for research. These include elucidating the origin of lattice strain, exploring more fine eutectic microstructures, artificially introducing nanoscale pinning sites, improving the superconducting critical temperature, and investigating the mechanical properties of these materials.</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 4","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143871428","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":"Electronic, thermodynamic, and magnetic properties of Cr and Mn (co)-doped cubic HfO2 for spintronics applications","authors":"O. El Gardy,&nbsp;T. El-Achari,&nbsp;L. B. Drissi,&nbsp;O. El Fatni,&nbsp;Rachid Ahl Laamara","doi":"10.1140/epjb/s10051-025-00919-0","DOIUrl":"10.1140/epjb/s10051-025-00919-0","url":null,"abstract":"<div><p>This study focuses on analyzing the electronic, thermodynamic and magnetic properties of doped and co-doped 3D HfO₂ materials using the Korringa–Kohn–Rostoker (KKR) Green's function method, combined with the coherent potential approximation (CPA) and the Generalized Gradient Approximation (GGA). Two types of impurities, chromium (Cr) and manganese (Mn), are examined. Density of states (DOS) calculations indicate that pure HfO₂ is a semiconductor with a bandgap of 3.22 eV, while substituting Hf with Cr or Mn leads to metallic behavior. Initially, we discuss the equilibrium lattice parameter of HfO₂. Subsequently, we study the band structure and DOS for both pure HfO₂ and various dopant concentrations. The half-metallic (HM) character of the doped compounds is investigated, and the mechanism of exchange interaction is identified. In conclusion, by increasing the dopant and codopant concentrations, we successfully enhanced the Curie temperatures. These results are promising for spintronics applications, suggesting that doped HfO₂ could be utilized in future spintronic devices.</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 4","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143871429","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":"Stability, lattice, transport and thermoelectric properties of (hbox {CdGa}_{2}hbox {Se}_{4}) and (hbox {ZnGa}_{2}hbox {Se}_{4}) ternaries","authors":"Elkana Rugut,&nbsp;Eric Maluta","doi":"10.1140/epjb/s10051-025-00906-5","DOIUrl":"10.1140/epjb/s10051-025-00906-5","url":null,"abstract":"<p>Structural properties of <span>(hbox {CdGa}_{2}hbox {Se}_{4})</span> and <span>(hbox {ZnGa}_{2}hbox {Se}_{4})</span> ternary compounds in their tetragonal phase have been investigated using the first-principles approach. These materials are stable, as supported by the computed vibrational and mechanical properties. Having established their stability, prediction of their thermal conductivity and consequently the dimensionless figure of merit was undertaken. According to the simulations results, these ternary compounds have fairly low values of lattice thermal conductivity of about 1.45 and 1.25 W/mK at room temperature for <span>(hbox {CdGa}_{2}hbox {Se}_{4})</span> and <span>(hbox {ZnGa}_{2}hbox {Se}_{4})</span>, respectively. Their Seebeck coefficient and electrical conductivity are moderate, resulting in outstanding thermoelectric properties as backed by the dimensionless figure of merits that are beyond unity, i.e., 1.17 and 1.27 for <span>(hbox {CdGa}_{2}hbox {Se}_{4})</span> and <span>(hbox {ZnGa}_{2}hbox {Se}_{4})</span>, correspondingly at a temperature of 1000 K. To our understanding, until now, there is lack of scientific report about thermoelectric properties of these compounds, forming the novelty of this study.</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 4","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjb/s10051-025-00906-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143871430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"An agent-based model to foster citizens’ sustainable behavior in the Italian city of Siena","authors":"Vittoria Socci,&nbsp;Eleonora Vitanza,&nbsp;Chiara Mocenni","doi":"10.1140/epjb/s10051-025-00910-9","DOIUrl":"10.1140/epjb/s10051-025-00910-9","url":null,"abstract":"<p>Climate change is irreversibly having an increasing impact on the environment, people and the economy worldwide. The contribution of each individual in counteracting its effects is crucial, as everyday actions, from a proper participation in waste sorting to responsible consumption choices, can shape a more resilient and environmentally friendly future. How much do the geographical and urban features of an Italian art city impact the spread of sustainable behaviors among its citizens? In this paper, we investigate the climate awareness and attitudes toward sustainability of citizens living in the historical center of Siena, a small art city among the most sustainable in Italy. Using a geo-referenced agent-based model (ABM) and game theory for the human decision-making process, we simulate how pro-environmental attitudes spread in a population of predominantly selfish individuals and in which there are also herding and anti-herding mechanisms. We claim that on the one hand, the conformation and geographical position of the city of Siena make it naturally sustainable, but at the same time its urban structure and connection networks seem to limit the spread of cooperative actions toward environmental protection.</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 4","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjb/s10051-025-00910-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143865498","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Synthesis of NiO and Cu-NiO nanoparticles using Syzygium samarangense fruit extract and its evolution as inorganic hole transport layer in perovskite solar cells","authors":"Saformia Johnson,&nbsp;Dhanus Kumar Bharathamani,&nbsp;Khaja Moiduddin,&nbsp;Syed Hammad Mian,&nbsp;Zeyad Almutairi,&nbsp;Janarthanan Balasundharam","doi":"10.1140/epjb/s10051-025-00914-5","DOIUrl":"10.1140/epjb/s10051-025-00914-5","url":null,"abstract":"<div><p>The current work used a bio-mediated green synthesis from the fruit extract of <b><i>Syzygium samarangense</i></b> to prepare nanoparticles of nickel oxide (NiO) and copper-doped NiO (Cu-NiO). X-ray diffraction (XRD), ultraviolet–visible (UV–Vis) spectroscopy, Fourier transform-infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM) with EDAX, and TEM analysis were carried out for the structural and optical characteristics of NiO and Cu-NiO nanoparticles. UV–DRS spectroscopy reveals that the NiO has high absorption peak at 311 nm and Cu-NiO has its highest peak at 325 nm. The grain size of NiO and Cu-doped NiO nanoparticles were obtained as 18.23 nm and 21.32 nm with cubic structure with agglomeration and porosity. The inferences from the optical study revealed the suitability of the material as a hole transport layer in solar cells.</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 4","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143861272","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":"Impact of diameter-to-length ratio on mechanical fatigue and cyclic behavior of gold nanowires: a molecular dynamics study","authors":"Muhammad Salsabil Nur Gunawan,&nbsp;Adam Fajri Asyidik,&nbsp;Tabina Putri Pintoro,&nbsp;Iwan Halim Sahputra","doi":"10.1140/epjb/s10051-025-00924-3","DOIUrl":"10.1140/epjb/s10051-025-00924-3","url":null,"abstract":"<div><p>Gold nanowires (AuNWs) exhibit exceptional mechanical properties, making them promising for nanoscale electronics. However, their mechanical reliability under cyclic loading, particularly the effects of diameter-to-length ratio and pulling rate, remains insufficiently understood. This study addresses this knowledge gap by investigating the impact of these factors on the mechanical fatigue behavior of AuNWs using molecular dynamics simulations. Stress–strain analyses and common neighbor analysis (CNA) were employed to assess mechanical responses and structural evolution during cyclic deformation. The findings reveal that smaller AuNWs (e.g., 1 nm diameter) undergo rapid strain hardening due to limited dislocation nucleation, resulting in high stress capacity but brittle failure. In contrast, larger AuNWs (3–9 nm diameters) exhibit greater plastic accommodation and localized deformation, delaying failure and enhancing mechanical stability. The pulling rate further modulates these behaviors, with higher rates increasing peak stresses and lower rates promoting plastic relaxation. By elucidating the interplay between diameter, loading conditions, and fatigue behavior, this study provides novel insights into the structural reliability of AuNWs, offering a foundation for their optimized design in advanced nanoscale applications.</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 4","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143856620","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":"Mismatch synchronization based on 4D memristive chaotic system and its application in image encryption","authors":"Jie Zhang,&nbsp;Jiliang Lv,&nbsp;Nana Cheng,&nbsp;Xiaodong Wei,&nbsp;Liu Yang","doi":"10.1140/epjb/s10051-025-00913-6","DOIUrl":"10.1140/epjb/s10051-025-00913-6","url":null,"abstract":"<div><p>A four-dimensional memristive chaotic system is proposed, and its dynamical characteristics are analyzed through conventional methods. In this system, transient chaos and bursting oscillations of the number of spikes controlled by parameters are also found. This paper also designs physical circuits and digital circuits to confirm the existence of chaotic systems. Additionally, a mismatch synchronization system is introduced, and the synchronization control is achieved using mismatch synchronization principles. Mismatch synchronization is integrated with RNA operation to develop an image encryption algorithm. The analyses show that the image encryption method proposed exhibits better performance.</p><h3>Graphical abstract</h3>\u0000<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 4","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143856470","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":"A dynamic mean-field study of spin-resolved static density response of warm-dense homogeneous electron gas","authors":"Priya Arora,&nbsp;R. K. Moudgil","doi":"10.1140/epjb/s10051-025-00916-3","DOIUrl":"10.1140/epjb/s10051-025-00916-3","url":null,"abstract":"<p>Motivated by recent ab initio path-integral Monte Carlo (PIMC) simulations by Dornheim et al. (Phys Rev Res 4:033018, 2022), we have studied the role of dynamic electron correlations in determining the spin-resolved static density response of warm-dense homogeneous electron gas having arbitrary spin-polarization <span>(zeta )</span>. To this endeavor, we have used the quantum or dynamical version of the self-consistent mean-field approximation of Singwi, Tosi, Land, and Sjölander (STLS), the so-called qSTLS approach. Particularly, we have calculated the spin-resolved components of static density response function, static structure factor, and local-field correction at selected <span>(zeta )</span> and a wide range of electron density/coupling <span>(r_s)</span> and degeneracy temperature <span>(theta )</span>. We compare our results directly with PIMC simulations and lower order theories such as (static) STLS and random phase approximation (RPA). The comparative analysis reveals that in metallic density regime (<span>(r_ssim 2)</span>), the dynamics of correlations is imperceptible in static density response and static structure factor, with both qSTLS and STLS exhibiting excellent agreement with PIMC. However, its influence grows continuously with increasing effective electron coupling (<span>(r_s/theta )</span>), manifesting as a better alignment of qSTLS predictions with PIMC data as compared to STLS. Interestingly, it accounts for, above a sufficiently large <span>(r_s)</span>, the emergence of a small negative portion (though qualitatively) in the PIMC spin-offdiagonal static density response function for wave vectors characteristic of average inter-electron spacing. An assessment of spin-resolved correlations brings out that <span>(uparrow uparrow )</span> correlations are underestimated, while their <span>(uparrow downarrow )</span> counterpart are overestimated, with a fortunate cancellation (closely at small coupling <span>(r_s)</span>) between their effects in the spin-summed static response and structure factor. Nevertheless, the spin components of self-consistent static local-field correction factor match with PIMC estimate mainly at small wave vectors, with even a qualitative mismatch between the two at <span>(r_s=2)</span> and <span>(theta =1)</span> for the <span>(uparrow uparrow )</span> component at large wave vectors, where the former saturates to a positive value as against a negative tail in the latter.</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"98 4","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143850900","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}