Physica B-condensed Matter最新文献_第9页

Spin Hall effect of light in magneto-optical thin-film structures 光在磁光薄膜结构中的自旋霍尔效应

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2025-04-30 DOI: 10.1016/j.physb.2025.417315

Robab Zadjamal-Sayfi, Reza Abdi-Ghaleh

引用次数: 0

Capacitance enhancement of Sm-doped hafnia MOS capacitors via cubic phase mediation 通过三次相介质增强sm掺杂铪金属氧化物半导体电容器的电容

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2025-04-30 DOI: 10.1016/j.physb.2025.417332

Sabhya, Dhananjaya Kekuda, K. Mohan Rao

{"title":"Capacitance enhancement of Sm-doped hafnia MOS capacitors via cubic phase mediation","authors":"Sabhya, Dhananjaya Kekuda, K. Mohan Rao","doi":"10.1016/j.physb.2025.417332","DOIUrl":"10.1016/j.physb.2025.417332","url":null,"abstract":"<div><div>The influence of Sm doping on hafnia (HfO2) films has been systematically investigated by fabricating a Metal Oxide Semiconductor Capacitor (MOS Cap). The effect of structural transformation on the dielectric properties of Sm-doped hafnia films has been explored. Sm-doping was carried out on films using a cost-efficient spin-coating method. From structural studies, phase transformation was noted, with an increase in Sm doping concentration in HfO2 films. X-ray photoelectron studies (XPS) indicated the passivation of oxygen vacancies in all the Sm-doped HfO2 films. Uniform, non-porous, and crack-free films were observed from morphological studies. The electrical and dielectric properties were investigated by integrating Sm-doped hafnia films as an oxide layer in Metal Oxide Semiconductor Capacitor (MOSCap). At lower Sm doping concentrations, a reduction in the leakage current of the films was observed. Capacitance-voltage measurements in the dielectric studies indicated that the cubic phase stabilization significantly contributes to the rise of the capacitance. The impact of Sm doping on the MOSCap parameters such as oxide charges, dielectric permittivity, interface trap densities, and effective oxide thickness have been examined thoroughly. The detailed study provided in this work could help to explore next-generation dielectrics using economical techniques.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"712 ","pages":"Article 417332"},"PeriodicalIF":2.8,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143906841","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}

引用次数: 0

First-principles study on selective laser melting of Ti48Al2Cr2Nb alloy Ti48Al2Cr2Nb合金选择性激光熔化第一性原理研究

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2025-04-30 DOI: 10.1016/j.physb.2025.417337

Peikang Bai , Pei Wang , Yutong Wang , Wenbo Du , Zhanyong Zhao , Yaohao Du , Fude Wang

引用次数: 0

Effect of magnetic ordering on the phonons of Co3Sn2S2: Temperature-dependent Raman study 磁有序对Co3Sn2S2声子的影响：温度相关的拉曼研究

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2025-04-30 DOI: 10.1016/j.physb.2025.417276

Sahil Rathi , Kapil Kumar , V.P.S. Awana , Satyendra Nath Gupta

{"title":"Effect of magnetic ordering on the phonons of Co3Sn2S2: Temperature-dependent Raman study","authors":"Sahil Rathi , Kapil Kumar , V.P.S. Awana , Satyendra Nath Gupta","doi":"10.1016/j.physb.2025.417276","DOIUrl":"10.1016/j.physb.2025.417276","url":null,"abstract":"<div><div>Co<math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math>Sn<math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math>S<math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math> is a magnetic Weyl semimetal with a magnetic phase transition at <math><mo>≈</mo></math> 170 K. Here, we report the effect of this magnetic phase transition on the lattice vibration and electron–phonon coupling of Co<math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math>Sn<math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math>S<math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math> using temperature dependent Raman scattering in the temperature range from 7 K to 300 K. The intensities of E<math><msub><mrow></mrow><mrow><mi>g</mi></mrow></msub></math> and A<math><msub><mrow></mrow><mrow><mn>1</mn><mi>g</mi></mrow></msub></math> phonons decrease as temperature is increased till the magnetic transition temperature (170 K) and exhibit no temperature dependence above the transition temperature. Further, the E<math><msub><mrow></mrow><mrow><mi>g</mi></mrow></msub></math> phonon exhibit much stronger temperature dependence than A<math><msub><mrow></mrow><mrow><mn>1</mn><mi>g</mi></mrow></msub></math> phonon in the magnetic phase. The frequencies and line widths of E<math><msub><mrow></mrow><mrow><mi>g</mi></mrow></msub></math> and A<math><msub><mrow></mrow><mrow><mn>1</mn><mi>g</mi></mrow></msub></math> modes also exhibit anomalous behavior above the magnetic transition temperature. We have used spin dependent phonon scattering model to understand these anomalies in phonon frequencies, line widths and intensities.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"712 ","pages":"Article 417276"},"PeriodicalIF":2.8,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143902324","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}

引用次数: 0

Drastic reduction of thermal conductivity of porous metal due to closed loops on electron trajectories 由于电子轨迹上的闭环，多孔金属的热导率急剧降低

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2025-04-29 DOI: 10.1016/j.physb.2025.417282

V.V. Maksimenko , V.A. Zagaynov , S.Yu. Krylov , I.E. Agranovski

引用次数: 0

Role of rare earth doping on structural, elastic, optical, and magnetic properties of Co-Cu spinel ferrite nanoparticles prepared by sol gel auto-combustion (SGAC) route 稀土掺杂对溶胶-凝胶自燃烧法制备Co-Cu尖晶石铁氧体纳米颗粒结构、弹性、光学和磁性能的影响

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2025-04-29 DOI: 10.1016/j.physb.2025.417331

A.M. Faramawy

{"title":"Role of rare earth doping on structural, elastic, optical, and magnetic properties of Co-Cu spinel ferrite nanoparticles prepared by sol gel auto-combustion (SGAC) route","authors":"A.M. Faramawy","doi":"10.1016/j.physb.2025.417331","DOIUrl":"10.1016/j.physb.2025.417331","url":null,"abstract":"<div><div>This study provides a comprehensive investigation of structural, elastic, optical, and magnetic characteristics of various rare earth elements substituted Co-Cu ferrite nanoparticles Co0.5Cu0.5RE0.05Fe1.95O4 (CCRE) (RE: Y3+, Dy3+, and Pr3+) synthesized by the sol-gel auto-combustion (SGAC) route. XRD revealed a nanocrystalline spinel phase with an average crystallite size 35 nm after Rietveld refinement. The cation distribution showed that RE3+ ions preferred to occupy the octahedral site. Using FTIR data, the force constant for the tetrahedral and octahedral sites was determined to obtain stiffness constants; while the elastic moduli (Young's modulus, bulk modulus, and rigidity), Poisson's ratio, and Debye temperature were computed based on the stiffness constants. The optical band gap increased when Co-Cu spinel ferrite doped with Y3+ and Pr3+ while decreased with Dy3+, and the refractive index reciprocated. Furthermore, interesting magnetic parameters as saturation magnetization, coercivity, anisotropy constant and Yafet–Kittel angles were obtained for the investigated samples. The microwave frequency (Wm) values for all CCRE nanoparticles fall within the range of 4.75 GHz–9.82 GHz. The low field approximation of Langevin equation was used to discuss the correlation between the magnetic properties of investigated nanoparticles and the switching field distributions (SFD) of CCRE nanoferrites. Ultimately, the magneto-mechanical and magneto-optical characteristics of Co-Cu nanoferrite doped with RE3+ provide opportunities for numerous applications.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"712 ","pages":"Article 417331"},"PeriodicalIF":2.8,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143922058","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}

引用次数: 0

Intermediate band formation, band gap tuning and optical response of transition metal doped CuGaS2 chalcopyrite: A first-principles strategy 过渡金属掺杂CuGaS2黄铜矿的中间能带形成、带隙调谐和光学响应：第一线原理策略

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2025-04-29 DOI: 10.1016/j.physb.2025.417320

Kishor Kumar , Amit Soni , Jagrati Sahariya

{"title":"Intermediate band formation, band gap tuning and optical response of transition metal doped CuGaS2 chalcopyrite: A first-principles strategy","authors":"Kishor Kumar , Amit Soni , Jagrati Sahariya","doi":"10.1016/j.physb.2025.417320","DOIUrl":"10.1016/j.physb.2025.417320","url":null,"abstract":"<div><div>We have reported first-principles investigation on formation of intermediate energy bands (IEBs), band gap tunning, optical response and origin of magnetism in TM-doped chalcopyrite CuGa1-xTMxS2 (TM = Cr, V, and Ti; x = 0.06, 0.12, and 0.50) using the full potential augmented plane wave (FP-LAPW) method within the framework of density functional theory. The Tran-Blaha modified Becke-Johnson (mBJ) exchange-correlation potential have been employed in computations. CuGa0.5Cr0.5S2 and CuGa0.5Ti0.5S2 chalcopyrites found to have metallic nature. 6 % Ti and 12 % V-doped CuGa1-xTMxS2 chalcopyrite have showed direct band gap. 6 % V-doped CuGa1-xTMxS2 have showed higher band gap value while the lowest band gap has been observed for 12 % Cr-doped CuGa1-xTMxS2. Increase in concentration of TM atom up to 12 % reduces the band gap value and increases the number of the IEBs. It is seen that higher doping concentration (50 %) of TM atoms ceases the formation of IEBs. Cr-doped CuGa1-xTMxS2 chalcopyrites have shown higher spin magnetic moments than V- and Ti-doped CuGa1-xTMxS2. Further, it is seen that d-states of the TM atom is responsible for magnetism in CuGa1-xTMxS2. Based on optical properties, CuGa0.88V0.12S2, CuGa0.5V0.5S2 and CuGa0.88Ti0.12S2 chalcopyrites have shown higher integrated absorption coefficient than the bulk silicon depicting prominent materials for photovoltaic and opto-electronic devices. Also, studied CuGa1-xTMxS2 have depicted good absorber of the ultra-violet radiation.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"712 ","pages":"Article 417320"},"PeriodicalIF":2.8,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143906718","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}

引用次数: 0

Thermal stability assessment of mixed phase AlCoCrFeNi high entropy alloy: In silico studies 混合相AlCoCrFeNi高熵合金的热稳定性评价：硅研究

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2025-04-28 DOI: 10.1016/j.physb.2025.417319

Nabila Tabassum, Yamini Sudha Sistla

{"title":"Thermal stability assessment of mixed phase AlCoCrFeNi high entropy alloy: In silico studies","authors":"Nabila Tabassum, Yamini Sudha Sistla","doi":"10.1016/j.physb.2025.417319","DOIUrl":"10.1016/j.physb.2025.417319","url":null,"abstract":"<div><div>Thermal stability assessment is crucial for materials used in high temperature applications. Present study uses atomistic simulations to demonstrate the changes in microstructural, mechanical and thermodynamic properties of mixed phase stabilized AlCoCrFeNi high entropy alloy (HEA) subjected to thermal treatment in the range of 298–2500K. Results infer that the alloy undergoes accelerated phase transition at 1700K as confirmed from a sudden increase in lattice parameters, cell volume, coefficient of thermal expansion, local lattice distortion and a sudden decrease in density, and number of nearest neighbors. The elastic moduli such as bulk modulus, shear modulus, Young's modulus, hardness, and fracture toughness, also showed a significant drop at 1700K followed by a rapid reduction till 2200K. The specific heat capacity, lattice thermal conductivity and Gruneisen parameter also showed abrupt changes at 1700 K confirming the onset of phase transition which was also confirmed from radial distribution function and centrosymmetry parameter at 298K and 1700K. The mixed phase AlCoCrFeNi has maintained good fracture toughness (4.8 MPa m0.5) and hardness (2.8 GPa) at 1700K. The HEA exhibited a very low lattice thermal conductivity of 0.71–3.5 W/m K. Analysis of mean square displacements of atoms indicates the displacement of atoms initiated at 1500 K and accelerated from 1800K which was also confirmed from microstructural changes depicting liquid phase through common neighbor analysis. Therefore, present study demonstrates the thermal stability and phase transition of mixed phase AlCoCrFeNi in the range of 1500–2200 K with a peak activity at 1700K.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"712 ","pages":"Article 417319"},"PeriodicalIF":2.8,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143912005","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}

引用次数: 0

Magnetization-driven quantum anomalous Hall effect and topological transitions in monolayer T-RuO2 单层T-RuO2中磁化驱动的量子反常霍尔效应和拓扑跃迁

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2025-04-28 DOI: 10.1016/j.physb.2025.417318

Weijing Yan , Yanqing Shen , Xin Yang , Zijian Wang , Xianghui Meng , Bing Zhang , Qing Ai , Yong Shuai , Zhongxiang Zhou

引用次数: 0

Enhanced light absorption and electronic properties of Janus MoSSe/antimonene van der Waals heterobilayer via strain 通过应变增强Janus MoSSe/antimonene van der Waals异质层的光吸收和电子性能

IF 2.8 3区物理与天体物理

Physica B-condensed Matter Pub Date : 2025-04-28 DOI: 10.1016/j.physb.2025.417321

J. Zhang, C.Y. Xu, Z.X. Guo, S.Q. Zhang, W.Y. Zhang, Z.X. Sun, F. Yang

{"title":"Enhanced light absorption and electronic properties of Janus MoSSe/antimonene van der Waals heterobilayer via strain","authors":"J. Zhang, C.Y. Xu, Z.X. Guo, S.Q. Zhang, W.Y. Zhang, Z.X. Sun, F. Yang","doi":"10.1016/j.physb.2025.417321","DOIUrl":"10.1016/j.physb.2025.417321","url":null,"abstract":"<div><div>Janus MoSSe with built-in electric field, offers a distinct advantage in separating photo-generated electrons and holes. An integration of monolayer MoSSe and antimonene forms van der Waals (vdW) heterostructure (MoSSe/Sb bilayer heterostructure), leading to the emergence of novel physical phenomena. Here, we have conducted a comprehensive investigation into electronic and optical properties of MoSSe/Sb BH, as well as the impact of biaxial strains, using first-principles calculations. Our results show that the vdW interaction is a key role in the stability of MoSSe/Sb pattern, and the contact characteristics are different for the two sides of MoSSe, SMoSe-Sb and SeMoS-Sb pattern. Notably, MoSSe/Sb structure demonstrate typical type-II band alignment, promoting the separating efficiency of carriers. Furthermore, applying an external strain is effective method to modify its built-in electric-field, resulting the enhancement of absorption coefficient. These results are expected to be applied in novel optoelectronic devices utilizing the MoSSe/Sb structure.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"712 ","pages":"Article 417321"},"PeriodicalIF":2.8,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143903259","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}

引用次数: 0