International Journal of Modern Physics B最新文献

{"title":"Investigating the preferential sites of Co2+ substitution in SrCoxFe12−xO19 using Mössbauer spectroscopy","authors":"Hengjian Hou, Zheng Li, Zeyi Lu, Jiyu Shen, Zhongjin Wu, Jiangbo Yang, Kaiyang Gao, Yanfang Xia","doi":"10.1142/s0217979225500353","DOIUrl":"https://doi.org/10.1142/s0217979225500353","url":null,"abstract":"<p>In this paper, a series of M-type hexagonal SrCo<sub><i>x</i></sub>Fe<span><math altimg=\"eq-00006.gif\" display=\"inline\" overflow=\"scroll\"><msub><mrow></mrow><mrow><mn>1</mn><mn>2</mn><mo>−</mo><mi>x</mi></mrow></msub></math></span><span></span>O<span><math altimg=\"eq-00007.gif\" display=\"inline\" overflow=\"scroll\"><msub><mrow></mrow><mrow><mn>1</mn><mn>9</mn></mrow></msub></math></span><span></span> (<span><math altimg=\"eq-00008.gif\" display=\"inline\" overflow=\"scroll\"><mi>x</mi><mo>=</mo><mn>0</mn></math></span><span></span>, 0.25, 0.5) samples have been prepared by sol–gel method. X-ray diffraction (XRD) showed that the samples produced were all p63/mmc space groups of single hexagonal crystals, and the lattice parameters <i>a</i>, <i>b</i> and <i>c</i> did not show the expected trend with increasing <i>x</i>. This was related to the valence changes and lattice distortion caused by the substitution of Co<span><math altimg=\"eq-00009.gif\" display=\"inline\" overflow=\"scroll\"><msup><mrow></mrow><mrow><mn>2</mn><mo>+</mo></mrow></msup></math></span><span></span> at the 2a and 4f<sub>2</sub> sites. Room temperature Mössbauer spectra studies showed that when <span><math altimg=\"eq-00010.gif\" display=\"inline\" overflow=\"scroll\"><mi>x</mi><mo>=</mo><mn>0</mn></math></span><span></span>, Fe<span><math altimg=\"eq-00011.gif\" display=\"inline\" overflow=\"scroll\"><msup><mrow></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup></math></span><span></span> ions were not uniformly distributed, preferring the 4f<sub>1</sub>, 4f<sub>2</sub> and 2a sites; when <span><math altimg=\"eq-00012.gif\" display=\"inline\" overflow=\"scroll\"><mi>x</mi><mo>=</mo><mn>0</mn><mo>.</mo><mn>2</mn><mn>5</mn></math></span><span></span>, Co<span><math altimg=\"eq-00013.gif\" display=\"inline\" overflow=\"scroll\"><msup><mrow></mrow><mrow><mn>2</mn><mo>+</mo></mrow></msup></math></span><span></span> ions preferentially displaced the 2a and 4f<sub>2</sub> sites and the presence of Fe<span><math altimg=\"eq-00014.gif\" display=\"inline\" overflow=\"scroll\"><msup><mrow></mrow><mrow><mn>2</mn><mo>+</mo></mrow></msup></math></span><span></span> was detected; when <span><math altimg=\"eq-00015.gif\" display=\"inline\" overflow=\"scroll\"><mi>x</mi><mo>=</mo><mn>0</mn><mo>.</mo><mn>5</mn></math></span><span></span>, Co<span><math altimg=\"eq-00016.gif\" display=\"inline\" overflow=\"scroll\"><msup><mrow></mrow><mrow><mn>2</mn><mo>+</mo></mrow></msup></math></span><span></span> ions preferentially displaced the 4f<sub>1</sub> and 2b sites and the percentage of Fe<span><math altimg=\"eq-00017.gif\" display=\"inline\" overflow=\"scroll\"><msup><mrow></mrow><mrow><mn>2</mn><mo>+</mo></mrow></msup></math></span><span></span> occupancy was reduced, with a greater occupancy (<span><math altimg=\"eq-00018.gif\" display=\"inline\" overflow=\"scroll\"><msub><mrow><mi>R</mi></mrow><mrow><mi>A</mi></mrow></msub><mo stretchy=\"false\">)</mo></math></span><span></span> occurring at the 12k site, indicating a preference of Fe<span><math altimg=\"eq-00019.g","PeriodicalId":14108,"journal":{"name":"International Journal of Modern Physics B","volume":"50 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140153161","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":"Synthesis, characterization and properties of Cr-doped ZnO nanoparticles via a facile solvothermal route","authors":"L. Renuga Devi, E. Selva Esakki, S. Meenakshi Sundar","doi":"10.1142/s0217979225500158","DOIUrl":"https://doi.org/10.1142/s0217979225500158","url":null,"abstract":"<p>Cr-doped ZnO (<span><math altimg=\"eq-00001.gif\" display=\"inline\" overflow=\"scroll\"><mi>x</mi><mo>=</mo><mn>0</mn><mo>.</mo><mn>0</mn><mn>2</mn></math></span><span></span>–0.08) nanoparticles are synthesized using the microwave solvothermal irradiation technique. The final product is calcinated at 450^∘C and the nanostructure of the material is investigated using various techniques. In structural studies, XRD analysis shows that the hexagonal wurtzite structure of ZnO is present in the standard JCPDS card. FESEM spectrum reveals the hexagonal shape of the synthesized samples and EDS provides information on the qualitative composition of the nanoparticles. Optical absorbance images show exciton peaks in the UV region, which can be attributed to Cr incorporation into the ZnO lattice, and the optical energy bandgap values are calculated using the tauc plot method. Photoluminescence (PL) emission spectra are measured using PL spectroscopy. Interestingly, vibrating sample magnetometry (VSM) reveals enhancements in the magnetic properties in M–H loops and it is widely used for biological applications like antibacterial activity.</p>","PeriodicalId":14108,"journal":{"name":"International Journal of Modern Physics B","volume":"50 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140152999","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":"Models based analysis of radiative induced MHD hybrid nanofluid flow over an exponentially stretching sheet","authors":"Nasrullah Khan, Nadeem Abbas, Aqila Shaheen, Wasfi Shatanawi","doi":"10.1142/s021797922550033x","DOIUrl":"https://doi.org/10.1142/s021797922550033x","url":null,"abstract":"<p>The study focuses on the flow of hybrid nanofluid, induced by magnetic and radiation effects, across an exponentially stretched sheet. The research examines the impact of temperature-dependent properties of the hybrid nanofluid on the sheet. Water is used as the base fluid, and SWCNT and MWCNT are employed as nanoparticles. The study includes a discussion of the Yamada–Ota, Xue and Tiwari–Das models of hybrid nanofluids. The governing system of flow is presented mathematically, and boundary layer approximations are used to reduce differential equations. The differential equations are transformed into dimensionless ordinary differential equations (ODEs) by using transformations. The dimensionless system of equations is then solved numerically. The results of the flow model are offered in tabular and graphical forms. We observed that Tiwari–Das model of hybrid nanofluid achieved more heat transfer and friction factor values when compared to other models of Xue and Yamada–Ota models of hybrid nanofluid. Temperature curves are noted to be enhanced by enlargement in the nano-concentration factor. If the nano-concentration increased in the fluid which boosted the thermal conductivity of the liquid, then as a result, the temperature of fluid enhanced at surface.</p>","PeriodicalId":14108,"journal":{"name":"International Journal of Modern Physics B","volume":"98 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140153162","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":"Landau–Zener–Stückelberg–Majorana-like dynamics induced by tunneling of spin qubit states in a multiband two-state magnetic quantum wire","authors":"S. E. Mkam Tchouobiap, L. C. Fai","doi":"10.1142/s0217979225500134","DOIUrl":"https://doi.org/10.1142/s0217979225500134","url":null,"abstract":"<p>We investigate the transfer between spin quantum bit (qubit) states and study the Landau–Zener–Stückelberg–Majorana (LZSM)-like dynamics of tunneling spin qubits in a multiband two-state magnetic quantum wire. Indeed, within the framework of an optical parabolic potential in a three-dimensional (3D) heterostructure quantum wire and under the influence of an external time-varying magnetic field, a model for a multiband two-state magnetic quantum wire is developed. Here, the external magnetic field is used to coherently manipulate and control spin qubit states. By driving the system through an avoided crossing, we consider the associated effective quantum two-level system (TLS) related to the spin qubit states in each band, driving by an external coherent magnetic field in which the related Hamiltonian is Hermitian, and which generally paves a way to LZSM interferometry. Thus, we establish the analytical expressions of the energy eigenvalues in each band and derive the analytical solution of the dynamical evolution of the tunneling probabilities of the associated TLS. Accordingly, nonadiabatic and adiabatic tunneling probabilities (survival and transition) are calculated for each band of the multiband TLS. In this respect, the nonadiabatic and adiabatic dynamical evolutions of the tunneling probabilities of spin qubit populations in the first four bands, with band quantum numbers <i>n</i> = 0, 1, 2 and 3 are analyzed. As a result, depending on the amplitude strength of the driven magnetic field and the magnitude of the driving frequency, we report two striking nonadiabatic and adiabatic scenarios in each band for both the diabatic and adiabatic states. In this context, driving the two states of each band of the multiband TLS related to the spin qubit states through an avoided level crossing can result in nontrivial and incoherent dynamics at certain phases, resulting to apparent inaccurate probabilities, especially in the case of strong driven magnetic field and high driving frequency.</p>","PeriodicalId":14108,"journal":{"name":"International Journal of Modern Physics B","volume":"120 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140152997","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":"The spin-5/2 Blume–Capel model by mean-field approach and renormalization group theory","authors":"I. A. Badrour, R. Aharrouch, N. Hachem, A. Al-Rajhi, M. El Bouziani","doi":"10.1142/s0217979225500146","DOIUrl":"https://doi.org/10.1142/s0217979225500146","url":null,"abstract":"<p>The spin-5/2 Blume–Capel model was studied using the mean-field approximation and the Migdal–Kadanoff renormalization group method for two- and three-dimensional systems. We determined the phase diagrams in the (crystal field, temperature) plane where the system exhibited first- and second-order phase transitions as well as isolated critical, bicritical and triple points. In order to show first-order transitions at low temperature, we presented the total magnetization per site and the derivative of the free energy as a function of the crystal field. Moreover, the critical exponents of the system were calculated by linearizing the renormalization transformation at the vicinity of the second-order fixed points.</p>","PeriodicalId":14108,"journal":{"name":"International Journal of Modern Physics B","volume":"142 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140152998","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":"Characterizing elastic wave reflection in a semiconducting isotropic diffusive medium with temperature rate-dependent nonlocal theory","authors":"Hashmat Ali, Iffat Sharif, Muhammad Jamal, Ehtsham Azhar","doi":"10.1142/s0217979224504344","DOIUrl":"https://doi.org/10.1142/s0217979224504344","url":null,"abstract":"<p>In this paper, we explore the application of nonlocal theory to analyze the phenomenon of coupled thermoelastic wave reflection in a semiconducting diffusive medium, considering its temperature rate dependence. The governing equations are deconstructed using the Helmholtz vector rule, allowing us to delve into the behavior of the system. By calculating the dispersion relation in terms of propagation speed, we investigate four coupled longitudinal waves alongside an independent nondispersive transverse wave within the local medium. The cut-off frequencies for each wave are discussed, shedding light on their characteristics. Furthermore, we delve into the phenomenon of coupled longitudinal displacement waves at the medium’s boundary. Analytical derivations of amplitude ratios are presented, accompanied by graphical representations of their behavior, focusing on a semiconductor material such as copper. We examine the effects of physical parameters, including the nonlocal and diffusive parameters, on the obtained results. It is important to note that the existing literature primarily lacks consideration of diffusivity and plasma transportation. Lastly, we validate our findings by investigating the conservation of energy within the system.</p>","PeriodicalId":14108,"journal":{"name":"International Journal of Modern Physics B","volume":"36 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140152994","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":"Trapping paramagnetic molecules in a dynamic magnetic trap","authors":"Sheng-Qiang Li, Jing Lin, Xue Chen, Nan-Nan Zhang","doi":"10.1142/s0217979225500237","DOIUrl":"https://doi.org/10.1142/s0217979225500237","url":null,"abstract":"<p>Trapping molecules in strong-field-seeking states is particularly attractive to scientists in the field of molecular optics. If the external field is strong enough, all molecules are strong-field seekers. Contrary to the weak-field-seeking states, molecules trapping in strong-field-seeking states can avoid the loss caused by the inelastic collision which is a stumbling block for evaporative and sympathetic cooling. Unfortunately, the formation of a magnetostatic maximum in free space is forbidden according to Maxwell’s equations and Earnshaw’s theory. In this paper, a dynamic magnetic trap consisting of three pairs of Helmholtz coils is proposed. The time-sequence control is given together with the distribution of the magnetic field in space. The influence of the switching frequency and electric current flowing through the wires on the number of trapped molecules is investigated. We obtain the changes in the locations and the phase-space distribution within a switching cycle by trajectory simulation. Finally, the influence of the time during which the field is off on the performance of our trap is studied.</p>","PeriodicalId":14108,"journal":{"name":"International Journal of Modern Physics B","volume":"23 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140153158","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":"Electromagnetically induced absorption and transparency in a ladder-type atomic system with different dressing mechanisms","authors":"Hao-Wei Ti, Xiang-An Yan, Hao-Gong Liu, Xi-Xi Bai, Xiao-Rui Huang, Zhou Guo, Chen-Jie Wang, Dan-Dan Zhang, Xiaoxiang Han","doi":"10.1142/s0217979225500109","DOIUrl":"https://doi.org/10.1142/s0217979225500109","url":null,"abstract":"<p>In a Doppler-broadened ladder-type Rubidium atomic system <span><math altimg=\"eq-00001.gif\" display=\"inline\" overflow=\"scroll\"><mn>5</mn><msub><mrow><mi>S</mi></mrow><mrow><mn>1</mn><mo stretchy=\"false\">/</mo><mn>2</mn></mrow></msub></math></span><span></span>–<span><math altimg=\"eq-00002.gif\" display=\"inline\" overflow=\"scroll\"><mn>5</mn><msub><mrow><mi>P</mi></mrow><mrow><mn>3</mn><mo stretchy=\"false\">/</mo><mn>2</mn></mrow></msub></math></span><span></span>–<span><math altimg=\"eq-00003.gif\" display=\"inline\" overflow=\"scroll\"><mn>5</mn><msub><mrow><mi>D</mi></mrow><mrow><mn>5</mn><mo stretchy=\"false\">/</mo><mn>2</mn></mrow></msub></math></span><span></span>, three-photon electromagnetically induced absorption (EIA) and transparency (EIT) in two schemes of two coupling lasers with different propagation directions are comprehensively studied. Two coupling fields are entangled tightly with each other and induce constructive interference such that we observe EIA as two coupling fields are counter-propagating. Two coupling fields are independent and cause destructive interference such that only enhanced EIT occurs when two coupling fields are co-propagating, although all of the Doppler-broadened atoms satisfy the condition for three-photon resonance. The experimental results are coincided with the numerically calculated spectra using the dressed perturbation method. The mechanisms of EIT and EIA could also be understood by the dressed-state pictures.</p>","PeriodicalId":14108,"journal":{"name":"International Journal of Modern Physics B","volume":"2013 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140047016","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":"Electromagnetic field on a photothermal semiconducting voids medium under Lord–Shulman and refined multi-phase lag models in thermoelasticity","authors":"Zahra S. Hafed, S. M. Abo-Dahab, A. A. Kilany, Sameh E. Ahmed","doi":"10.1142/s0217979225500079","DOIUrl":"https://doi.org/10.1142/s0217979225500079","url":null,"abstract":"<p>This study investigates the contemporary thermoelasticity theories in a photothermal semiconducting medium with voids influenced by the electromagnetic field. Boundary conditions of the phenomenon were based on the equations that regulate it concerning the stresses, carrier density, change in volume fraction field and temperature on the surface space. The equations were solved in normal mode technique, and the results are displayed by graphs. A comparison has been made with the findings of the literature when neglecting the new external parameters. The findings show that the presence or absence of electromagnetic field and carrier density significantly impacts on the phenomenon. From the results obtained, it is clear that the effects of electromagnetic field, carrier density, volume fraction and thermal relaxation times are very pronounced and applicable in diverse fields including geophysics, astronomy, engineering, biology, etc.</p>","PeriodicalId":14108,"journal":{"name":"International Journal of Modern Physics B","volume":"272 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140047015","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":"Hidden skyrmion on the spin direction of the Majorana zero mode","authors":"Xin Shang, Huimin Tang","doi":"10.1142/s0217979225500055","DOIUrl":"https://doi.org/10.1142/s0217979225500055","url":null,"abstract":"<p>The spin information of Majorana zero mode (MZM) has important application value in distinguishing MZM from other zero energy states. We study the spin direction of the Majorana zero mode (MZM) localized in a vortex state in a topological superconductor. We find that the topological number of the magnetic structure of the MZM is zero. However, with an increase in the vortex radius, the magnetic structure of the electron oscillates between the antiskyrmion and skyrmion (starting with the antiskyrmion), while that of the hole oscillates between the skyrmion and antiskyrmion (starting with the skyrmion). The total magnetic structure of the electron is a antiskyrmion (the topological number is −1) while that of the hole is a skyrmion (the topological number is 1). We hope these new features provide more characters for detection and regulation of MZM.</p>","PeriodicalId":14108,"journal":{"name":"International Journal of Modern Physics B","volume":"44 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2024-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140047095","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}