Indian Journal of Physics最新文献_第4页

f(Q, T) gravity: from early to late-time cosmic acceleration f(Q,T)引力：从早期到晚期的宇宙加速度

IF 1.6 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-09-10 DOI: 10.1007/s12648-024-03400-3

Surajit Das, Sanjay Mandal

引用次数: 0

Many-body localization properties of disordered interacting fermionic systems 无序相互作用费米子系统的多体定位特性

IF 1.6 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-09-08 DOI: 10.1007/s12648-024-03399-7

K. Yapara, E. N. Djoukouo, C. Bouri, M. H. B. Mackongo, M. G. Kwato Njock

引用次数: 0

Propagation of dust lower hybrid wave in dusty magneto dense plasma with polarization force effect 具有极化力效应的尘埃磁致密等离子体中尘埃下杂波的传播

IF 1.6 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-09-06 DOI: 10.1007/s12648-024-03394-y

Aleena Yaseen, Zahid Mir, Bilal Ramzan

引用次数: 0

DFT study of electronic structure, magnetic and optical properties of Zr based full-Heusler alloys Zr2FeZ (Z = Al, Ga, In) Zr 基全赫斯勒合金 Zr2FeZ（Z = Al、Ga、In）的电子结构、磁性和光学特性的 DFT 研究

IF 1.6 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-09-06 DOI: 10.1007/s12648-024-03367-1

A. Amudhavalli, P. Dharmaraja, M. Manikandan, R. RajeswaraPalanichamy, K. Iyakutti

{"title":"DFT study of electronic structure, magnetic and optical properties of Zr based full-Heusler alloys Zr2FeZ (Z = Al, Ga, In)","authors":"A. Amudhavalli, P. Dharmaraja, M. Manikandan, R. RajeswaraPalanichamy, K. Iyakutti","doi":"10.1007/s12648-024-03367-1","DOIUrl":"10.1007/s12648-024-03367-1","url":null,"abstract":"<div>Ab-initio calculations are carried out to analyze the half metallic and ferromagnetic property of full-Heusler alloys Zr2FeZ (Z = Al, Ga, In) with both Cu2MnAl (L21) and Hg2CuTi (XA) structures. The ground state energy of both the structures predicted that ferromagnetic state is stable compared to the non- magnetic state. In the Cu2MnAl structure, these full Heusler alloys are metallic. The spin up state is found to be metallic and spin down state is observed as semiconducting in Hg2CuTi structure, which predicts that these alloys are half metallic in Hg2CuTi structure. The band structure of spin down state revealed that these alloys have an indirect band gap. For these Zr2FeZ (Z = Al, Ga, In) full Heusler alloys, the total magnetic moment calculated is to be around 1µB. The Slater Pauling rule μt = Zt − 18 is obeyed. The optical parameters, such as, dielectric function, energy loss function, refractive index, reflectivity, absorption and extinction coefficients are reported. For spintronic devices, these new Zr-based Heusler alloys can be used.</div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"99 4","pages":"1309 - 1318"},"PeriodicalIF":1.6,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142215793","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}

引用次数: 0

Room temperature AC properties and impedance analysis of Mg ferrite/polypyrrole (PPy) and Mg ferrite/reduced graphene oxide (rGO) composites 铁氧体镁/聚吡咯（PPy）和铁氧体镁/还原氧化石墨烯（rGO）复合材料的室温交流特性和阻抗分析

IF 1.6 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-09-05 DOI: 10.1007/s12648-024-03372-4

Bilal Ibrahim, Samia A. Saafan, R. E. El Shater, Maha K. Omar

{"title":"Room temperature AC properties and impedance analysis of Mg ferrite/polypyrrole (PPy) and Mg ferrite/reduced graphene oxide (rGO) composites","authors":"Bilal Ibrahim, Samia A. Saafan, R. E. El Shater, Maha K. Omar","doi":"10.1007/s12648-024-03372-4","DOIUrl":"10.1007/s12648-024-03372-4","url":null,"abstract":"<div>The auto-combustion sol–gel method has been used to synthesize a powder sample of MgFe2O4 nanoparticles. Nanocomposites of Mg-ferrite/PPy and Mg-ferrite/rGO have been prepared by thorough physical mixing, with weight ratios of 20% PPy and 20% rGO, respectively. To have a full insight into the materials, their structural properties have been investigated by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and Fourier transform infrared spectroscopy (FT-IR). DC conductivity has been investigated too, and by comparing the results, it has been observed a significant increase in the DC conductivity of the Mg-ferrite/PPy composite sample compared to the corresponding Mg-ferrite/rGO sample, a finding that would potentially impact the composite’s applications. The discussion of the frequency dependence of ε′, σac, and tan(δ) in these composite samples revolves around the concept of Maxwell–Wagner interfacial polarization. The sample Cole–Cole plots show distinct areas where incomplete semicircles overlap, each representing a different conduction process. These semicircles correspond to two equivalent circuits of parallel resistor–capacitor (R–C) combinations connected in series. Finally, it could be concluded that the new nanocomposite samples of MgFe2O4/20% rGO and MgFe2O4/20% PPy show dielectric properties that may be a stimulus for more studies in future work, where they are expected to be promising candidates for supercapacitor applications.</div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"99 4","pages":"1335 - 1345"},"PeriodicalIF":1.6,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s12648-024-03372-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142215850","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}

引用次数: 0

Cosmic Evolution of the Kantowski-Sachs Universe in the Context of a Bulk Viscous String in Teleparallel Gravity 远距离平行引力中的大体积粘性弦背景下的康托斯基-萨克斯宇宙的宇宙演化

IF 1.6 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-09-05 DOI: 10.1007/s12648-024-03405-y

S. R. Bhoyar, Yash B. Ingole

{"title":"Cosmic Evolution of the Kantowski-Sachs Universe in the Context of a Bulk Viscous String in Teleparallel Gravity","authors":"S. R. Bhoyar, Yash B. Ingole","doi":"10.1007/s12648-024-03405-y","DOIUrl":"10.1007/s12648-024-03405-y","url":null,"abstract":"<div>In the present work, we analyzed the Kantowski-Sachs cosmological model and teleparallel gravity, where a bulk viscous fluid containing one-dimensional cosmic strings is the source for the energy−momentum tensor. To obtain the deterministic solution of the field equations, we employed the proportionality condition linking the shear scalar ((sigma )) and the expansion scalar ((theta )), establishing a relationship between metric potentials. Another approach employed is the hybrid expansion law (HEL). The discussion focuses on the behavior of the accelerating universe concerning the specific choice of a nonlinear (or power law model) of teleparallel gravity (f(T)=alpha T + beta T^m), where T is the torsion scalar, (alpha), and (beta) are model parameters and m is restricted to greater than or equal to 2. The effective equation of the state parameter ((omega _{eff})) of models will support the acceleration of the universe. We observed that the null and weak energy conditions are obeyed but violate the strong energy condition as per the present accelerating expansion. Under specific model parameter constraints, the universe shows a transition from a decelerating to an accelerating phase.\u0000</div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"99 5","pages":"1589 - 1601"},"PeriodicalIF":1.6,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142215784","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}

引用次数: 0

Relativistic star with Bose–Einstein condensate core and polytropic envelope in Karmarkar regime 具有玻色-爱因斯坦凝聚态内核和多向性包层的卡玛卡尔机制相对论星体

IF 2 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-09-05 DOI: 10.1007/s12648-024-03408-9

Amos V. Mathias, Jefta M. Sunzu, Jason M. Mkenyeleye

引用次数: 0

Heavy ion fusion simulation in key parameters optimization using multilayer fuel target and the effectiveness of ponderomotive force in ion acceleration 利用多层燃料靶进行关键参数优化的重离子聚变模拟以及离子加速中的思索动力的有效性

IF 1.6 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-09-05 DOI: 10.1007/s12648-024-03397-9

A A Shayanmoghadam, S N Hosseinimotlagh, S M R Reisosadat

{"title":"Heavy ion fusion simulation in key parameters optimization using multilayer fuel target and the effectiveness of ponderomotive force in ion acceleration","authors":"A A Shayanmoghadam, S N Hosseinimotlagh, S M R Reisosadat","doi":"10.1007/s12648-024-03397-9","DOIUrl":"10.1007/s12648-024-03397-9","url":null,"abstract":"<div>In heavy ion fusion through Inertial Confinement Fusion, key points such as the production and driver energy delivery, fuel pellet design, physics of fuel pellet implosion, nuclear fusion reactor design, etc. are important. In this paper, we determine the stopping power, deposited energy, and the produced flux of secondary particles using the irradiation of multilayer spherical fuel pellet containing DT, D3He, and p11B by Pb and Cs heavy ion beams with energies of 8 and 10 GeV via GEANT4 simulation code, respectively. This work shows that by changing the selected heavy ion beam and its energy, as well as by changing the thickness of the layers and the type of ingredients in the fuel pellet, the obtained results change. The optimum gain of the deposited energy due to the choice of two selective heavy ion beams Pb and Cs that we obtained in this study, is related to the DT target compared to the two aneutronic targets of D3He and P11B in both energy 8 and 10 GeV. Finally, we use laser-plasma accelerator and determine theoretically the ponderomotive force.</div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"99 5","pages":"1909 - 1928"},"PeriodicalIF":1.6,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142215782","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}

引用次数: 0

Theoretical insight into the stability, magneto-electronic and thermodynamic properties of the new half-metallic ferromagnetic compounds Cr2RbZ (Z=Ge, In and Sb): probed by DFT 对新型半金属铁磁化合物 Cr2RbZ（Z=锗、铟和锑）的稳定性、磁电子学和热力学性质的理论洞察：通过 DFT 进行探测

IF 1.6 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-09-04 DOI: 10.1007/s12648-024-03413-y

I. Asfour

{"title":"Theoretical insight into the stability, magneto-electronic and thermodynamic properties of the new half-metallic ferromagnetic compounds Cr2RbZ (Z=Ge, In and Sb): probed by DFT","authors":"I. Asfour","doi":"10.1007/s12648-024-03413-y","DOIUrl":"10.1007/s12648-024-03413-y","url":null,"abstract":"<div>The objective is to determine the structural, elastic, electronic, magnetic and thermodynamic properties of new half-metallic Cr2RbGe, Cr2RbIn and Cr2RbSb by using the full-potential linearized augmented plane wave (FP-LAPW) method based on density functional theory and implemented in WIEN2K code. The exchange–correlation potential is evaluated using the generalized gradient approximation (GGA) within the Perdew-Burke-Ernzerhof (PBE) parameterization. Results on lattice parameters, bulk modulus, elastic, energy band gap and magnetic properties are reported. The elastic properties have shown the conformity of elastic constants with the stability criteria and the ductile nature of the compounds. The electronic band structures and density of states (DOS) of the compounds indicate they are half metallic because of the existence of the energy gap in the minority spin (DOS and band structure), which yields perfect spin polarization. These compounds Cr2RbZ (Z = Ge, In and Sb) are found to be Half-metallic in the spin-down channel and metallic in the spin-up channel, which leads to a spin polarization of 100% with a integer magnetic moment of 8.00 μB, 8.00 μB and 9.00 μB for Cr2RbGe, Cr2RbIn and Cr2RbSb respectively, is mainly contributed by the Cr atom. The thermodynamic stability of these compounds are also determined. In addition the temperature and pressure effects on the bulk modulus, heat capacities, Debye temperatures and entropy are computed and discussed in details, temperature and pressure dependence of thermodynamic properties of these materials have been examined in the ranges (0–1000 K) and (0–16 GPa), respectively. All the aforementioned results indicate that this new compounds would be an ideal candidate in spintronic.</div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"99 5","pages":"1659 - 1678"},"PeriodicalIF":1.6,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142215792","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}

引用次数: 0

The role of wire-mesh electrodes on the mode transition of dielectric barrier discharge and its effects on the surface wettability of polycaprolactone 网状电极对介电阻挡放电模式转换的作用及其对聚己内酯表面润湿性的影响

IF 1.6 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-09-04 DOI: 10.1007/s12648-024-03410-1

Ali Akbar Khan, Yap Seong Ling, Zaira Zaman Chowdhury

引用次数: 0