Indian Journal of Physics最新文献_第4页

Influence of Eu-doping on transport properties of synthesized zintl phase compounds EuxYb1−xZn2Sb2 under microwave-assisted solid-state 微波辅助固态下掺杂 Eu 对合成锌锡化合物 EuxYb1-xZn2Sb2 输运特性的影响

IF 2 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-09-03 DOI: 10.1007/s12648-024-03404-z

Ibrahim Majeed Jasim, A. Hmood

{"title":"Influence of Eu-doping on transport properties of synthesized zintl phase compounds EuxYb1−xZn2Sb2 under microwave-assisted solid-state","authors":"Ibrahim Majeed Jasim, A. Hmood","doi":"10.1007/s12648-024-03404-z","DOIUrl":"https://doi.org/10.1007/s12648-024-03404-z","url":null,"abstract":"In this work, synthesis and characterization of EuxYb1−xZn2Sb2 (0 ≤ × ≤ 1.0) systems under microwave irradiation method. Herein, microwave technique offers ecological merit in the synthesis of thermoelectric materials such as short duration (25 min). The synthesized samples were analyzed by their XRD, SEM, EDX, Seebeck coefficient, electrical conductivity, and Hall voltage measurements. The microwave synthesis of compounds by doping Eu into YbZn2Sb2 and their properties are extensively discussed. It was found that the microwave irradiation acts to accelerate the reactions induced by fast heat surrounding susceptor of primary components and give large quaternary ingots. The XRD data revealed that the synthesized compounds crystallized in a hexagonal structure where ZnSb precipitated as a secondary phase in almost all the synthesized adopted compounds. Furthermore, a maximum PF of 26.27 μW/cmK2 at 518 K was acquired for Eu0.6Yb0.4Zn2Sb2 sample with carrier concentration of 5.11 (times ) 1021 cm−3 at 300 K.","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"3 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142215851","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

Improved thermal conductivity and its application 改进的导热性及其应用

IF 1.6 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-09-03 DOI: 10.1007/s12648-024-03393-z

Priyanka Sahare, Bijay Kumar Sahoo

{"title":"Improved thermal conductivity and its application","authors":"Priyanka Sahare, Bijay Kumar Sahoo","doi":"10.1007/s12648-024-03393-z","DOIUrl":"10.1007/s12648-024-03393-z","url":null,"abstract":"<div>The quantum efficiency of GaN/ AlxGa1−xN/GaN superlattice (SL) UV-LED is reduced as a result of temperature rise in the active region of the LED. Self-heating of the device due to the temperature rise strengthens non-radiative processes, low internal efficiency, and a small lifetime of the LED. In this work, it is found that poor heat dissipation from the device due to low thermal conductivity (k) of the SL is one reason for temperature rise. In this investigation, we found that a 15% enhancement in k reduces a 7% temperature rise. A strategy of structural optimization has been carried out to demonstrate the improvement in k. It can be improved by managing the well barrier thickness ratio (r) in the SL. In this study, we found that for r < 1, k shows considerable enhancement. This well barrier thickness tailoring technique has two significant consequences: 1. improvement in k; 2. suppression of the detrimental effect of polarization on k. This work suggests that composition x, and structural optimization (well barrier thickness engineering), have a vital role in thermal conductivity management in SL, which can reduce the rise in temperature resulting in the high quantum efficiency of the UV-LED.</div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"99 4","pages":"1393 - 1400"},"PeriodicalIF":1.6,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142215857","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

Realistic fermion mass and mixing in (mathbf {U(1)_L}) model with (mathbf {A_4}) flavor symmetry for majorana neutrino 具有$$mathbf {A_4}$$风味对称性的$$mathbf {U(1)_L}$模型中大中微子的现实费米子质量和混杂度

IF 1.6 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-09-02 DOI: 10.1007/s12648-024-03375-1

V. V. Vien

{"title":"Realistic fermion mass and mixing in (mathbf {U(1)_L}) model with (mathbf {A_4}) flavor symmetry for majorana neutrino","authors":"V. V. Vien","doi":"10.1007/s12648-024-03375-1","DOIUrl":"10.1007/s12648-024-03375-1","url":null,"abstract":"<div>We propose a (U(1)_L) model based on (A_4) symmetry aiming to explain the smallness of neutrino masses as well as the quark and lepton mixing patterns. The smallness of Majorana neutrino mass is reproduced through the combination of type-I and -II seesaw mechanisms. The model can accommodate the current observed patterns of lepton and quark mixing in which the solar neutrino mixing angle and the Dirac CP violating phase are in (3sigma ) range for both normal hierarchy and inverted hierarchy, the Majorana violating phases are predicted to be (eta _{1} in (0.00, 9.76)^circ ) and (eta _{2} in (68.70, 270.00)^circ ) for normal hierarchy while (eta _1in (0.00, 10.83)^circ ) and (eta _{2} in (78.60, 90.00)^circ ) for inverted hierarchy. The obtained sum of neutrino mass and the effective Majorana neutrino mass are in good consistent with the recent limits. For quark sector, all the quark masses can get the best-fit values and all the elements of the quark mixing matrix are in agreement with the experimental constraints except the element ( (V_{{{text{CKM}}}} )_{{21}} ) with a deviation about (0.25,%).</div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"99 3","pages":"1165 - 1183"},"PeriodicalIF":1.6,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142215854","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

Sharma-mittal HDE model in anisotropic universe 各向异性宇宙中的 Sharma-mittal HDE 模型

IF 2 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-09-01 DOI: 10.1007/s12648-024-03374-2

T. Vinutha, K. Niharika, K. Venkata Vasavi

{"title":"Sharma-mittal HDE model in anisotropic universe","authors":"T. Vinutha, K. Niharika, K. Venkata Vasavi","doi":"10.1007/s12648-024-03374-2","DOIUrl":"https://doi.org/10.1007/s12648-024-03374-2","url":null,"abstract":"The current study explores the Sharma-Mittal holographic dark energy (SMHDE) by considering Bianchi-(VI_0) space-time in Saez-Ballester’s theory. The model’s exact solutions are procured by assuming the relationship between metric potentials. The Hubble horizon is regarded as the Infrared cutoff to examine our model’s cosmic effects. The physical behavior of the model is investigated by considering two fluids- SMHDE and pressureless matter. The behavior of the cosmological parameters, such as the deceleration parameter, EoS parameter, (rho _{de}), (rho _m), statefinder, and (v_s^2), was evaluated with the help of their plots with respect to redshift(z) to study the nature of the universe. The figure of the deceleration parameter predicts that the present model transits from the deceleration to the acceleration period of the universe. The EoS parameter for this model agrees with the recent astrophysical observations, which lie within the range of quintessence region. In the case of statefinder and (v_s^2), the model shows Chaplygin gas and stability throughout the region. The perturbation technique is used to evaluate the stability of the resulting model. Finally, the results of the current model support the existence of an accelerating universe with the present observational data.","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"21 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142215855","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

Effects of magnetic field on the Rashba spin–orbit interaction in an asymmetry quantum well 磁场对不对称量子阱中拉什巴自旋轨道相互作用的影响

IF 2 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-08-31 DOI: 10.1007/s12648-024-03376-0

Shan Shuang, Lan Hong, Jun Ge, Da.-Quan Liu

引用次数: 0

First principles insight into magneto-electronic and optical properties of half-metallic-ferromagnetism binary GaN compound for spintronic applications 对用于自旋电子应用的半金属铁磁二元氮化镓化合物的磁电子和光学特性的第一原理认识

IF 1.6 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-08-30 DOI: 10.1007/s12648-024-03240-1

Nazia Iram, Aparna Dixit, Bandar Ali Al-Asbahi, Ramesh Sharma, Javed Ahmad, Zubair Ahmad, Imad Barsoum

引用次数: 0

Valley polarization of electrons in a graphene under modulations of the electrostatic potential barrier and the magnetic field 静电势垒和磁场调制下石墨烯中电子的谷极化

IF 1.6 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-08-29 DOI: 10.1007/s12648-024-03390-2

R. S. Luo, J. D. Lu, X. Y. Li, H. Wang

引用次数: 0

Lie symmetry approach for shock wave propagation in a self-gravitating non-ideal gas under the influence of monochromatic radiation and magnetic field in rotating medium 旋转介质中单色辐射和磁场影响下自重力非理想气体中冲击波传播的李对称方法

IF 1.6 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-08-29 DOI: 10.1007/s12648-024-03352-8

G. Nath, P. Upadhyay

{"title":"Lie symmetry approach for shock wave propagation in a self-gravitating non-ideal gas under the influence of monochromatic radiation and magnetic field in rotating medium","authors":"G. Nath, P. Upadhyay","doi":"10.1007/s12648-024-03352-8","DOIUrl":"10.1007/s12648-024-03352-8","url":null,"abstract":"<div>The propagation of cylindrical shock wave influenced by monochromatic radiation and magnetic field in a self-gravitating non-ideal gas for a rotating medium has been investigated by using the Lie symmetry method. Ahead of the shock front, the ambient density of the medium is taken as constant, while the magnetic field, azimuthal and axial velocities vary over time. By using the Lie symmetry approach, the optimal system for the governing equations, the similarity variable and transformations are obtained. By the use of derived similarity transformations, the governing equations change into a system of ODEs (ordinary differential equations). The software package “Mathematica” has been utilized to solve the system of ODEs numerically and to generate the graphs for the flow variables distribution. In this article, the strength of the shock wave and variations in the flow variables of the flow field region behind the shock front, which are influenced by the strength of the ambient magnetic field, gravitational parameter, non-idealness parameter, adiabatic exponent, and rotational parameter, are examined in detail. It has been demonstrated that the magnetic field, non-idealness parameter, adiabatic exponent, and rotational parameter have decaying effect on the shock wave. In contrast, the gravitational parameter has reversed impact on the shock strength.</div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"99 4","pages":"1519 - 1540"},"PeriodicalIF":1.6,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142215856","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

Structural and optical properties of Cr3+ doped SiO2 nanophosphor 掺杂 Cr3+ 的二氧化硅纳米磷的结构和光学特性

IF 1.6 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-08-29 DOI: 10.1007/s12648-024-03392-0

L. F. Koao, R. A. Phokojoe, R. G. Moji, S. V. Motloung, T. E. Motaung, H. C. Swart

{"title":"Structural and optical properties of Cr3+ doped SiO2 nanophosphor","authors":"L. F. Koao, R. A. Phokojoe, R. G. Moji, S. V. Motloung, T. E. Motaung, H. C. Swart","doi":"10.1007/s12648-024-03392-0","DOIUrl":"10.1007/s12648-024-03392-0","url":null,"abstract":"<div>SiO2:x% Cr3+ (0 ≤ x ≤ 8) nanopowder samples were synthesized using the sol-gel method. The effect of Cr3+ doping concentration on the SiO2 nanoparticles was studied for possible application in light-emitting diodes (LEDs). Structure and optical properties of undoped and Cr3+ doped SiO2 nanoparticles were investigated in detail. X-ray diffraction (XRD) results confirmed the amorphous phase for undoped SiO2 (A-SiO2) nanopowder. However, above 0.8% Cr3+ there were secondary peaks due rhombohedral structure of chromium (III) oxide (R-Cr2O3). Ultraviolet-visible spectroscopy (UV-Vis) spectra showed a reflectance peak at around 320 nm for the undoped sample. The results showed that when the concentration of Cr3+ is increased there was an emergence of reflectance peaks at around 309, 419, and 553 nm which were attributed to the presence of the Cr2O3 lattices. The photoluminescence (PL) results revealed that with an increase in the amount of Cr3+, the maximum peaks in blue and near red emerge at around 2.82 and 1.89 eV, respectively. Those peaks may be due to defects within both SiO2 and R-Cr2O3. The emission peaks of undoped and Cr3+ doped SiO2 match well with the Uv-vis results. The international illumination colour chromaticity showed that above 0.8% Cr3+ the colour shifts from yellow to blue with an increase in Cr3+ concentration. The investigation indicated that Cr3+ doped SiO2 have a potential application in blue and yellow LED chips for lighting.</div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"99 4","pages":"1387 - 1392"},"PeriodicalIF":1.6,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s12648-024-03392-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142215871","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

Study of multiple degrees of freedom entanglement in optical fiber 光纤中多自由度纠缠的研究

IF 1.6 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-08-28 DOI: 10.1007/s12648-024-03378-y

Huimin Zhang, Chaoying Zhao

引用次数: 0