Journal of Physics: Condensed Matter最新文献_第5页

Pairing phase favored by magnetic frustration. 配对相位受磁沮度的影响。

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2024-11-13 DOI: 10.1088/1361-648X/ad922b

Arthur Krindges, Carlos Alberto Morais, Mateus Schmidt, Fabio M Zimmer

{"title":"Pairing phase favored by magnetic frustration.","authors":"Arthur Krindges, Carlos Alberto Morais, Mateus Schmidt, Fabio M Zimmer","doi":"10.1088/1361-648X/ad922b","DOIUrl":"https://doi.org/10.1088/1361-648X/ad922b","url":null,"abstract":"The interplay between magnetic frustration and pairing is investigated by adopting a BCS-like pairing mechanism on the frustrated $J_1-J_2$ Ising model on the square lattice. The ground-state and thermal phase transitions of the model are analyzed using a fermionic formulation within a cluster mean-field method. In this approach, the lattice system is divided into identical clusters, where the intracluster dynamic is exactly solved, and the intercluster interactions are replaced by self-consistent mean fields. We introduce a framework with two pairing couplings: an intracluster local coupling, $g$, which controls the electron pairing and its mobility within the clusters, and an intercluster coupling, $g'$, which adjusts the pairing mechanism between clusters. Tuning $g'/g$ allows evaluating how the pairing phase evolves from a weak pairing coupling between clusters (clustered system) to a strong one ($g' rightarrow g$, homogeneous system). In the range $0 le g'/g le 1$, we find that a gradual increase in $g'/g$ favors the pairing phase and induces a change in criticality. In particular, our results reveal the presence of tricriticality for a certain range of $g'/g$. In addition, an increase in competing magnetic interactions weakens the magnetic orders, causing the pairing phase to occur at lower strengths of pairing interactions, especially when $g' = g$. Therefore, our findings support that magnetic frustration favors the pairing phase, contributing to the onset of a superconducting state.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142622555","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

Composite quadrupole order in ferroic and multiferroic materials. 铁性和多铁性材料中的复合四极秩序。

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2024-11-12 DOI: 10.1088/1361-648X/ad8ea3

R Matthias Geilhufe

引用次数: 0

Charge transfer induced phase transition in Li₂MnO₃at high pressure. 高压下 Li2MnO3 中电荷转移诱导的相变。

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2024-11-12 DOI: 10.1088/1361-648X/ad8b8f

Ajinkya P Khangal, Nishant N Patel, Ajay K Mishra

{"title":"Charge transfer induced phase transition in Li2MnO3at high pressure.","authors":"Ajinkya P Khangal, Nishant N Patel, Ajay K Mishra","doi":"10.1088/1361-648X/ad8b8f","DOIUrl":"10.1088/1361-648X/ad8b8f","url":null,"abstract":"Efficient and better energy storage materials are of utmost technological importance to reduce energy dependence on the fossil fuels. Li2MnO3is one such material having potential to meet most of the requirements for energy storage. This material has been synthesized using solid state synthesis route. High pressure structural and vibrational studies on this material have been carried out upto ∼22 and 26 GPa respectively. These investigations show occurrence of a hitherto unknown second order phase transition to a new low symmetry phase whose symmetry is constrained to be monoclinic with space group P21/n at pressure of ∼2.3 GPa in Li2MnO3. The bulk modulus and its derivative determined by fitting theP-Vdata with third order Birch-Murnaghan equation of state are 113.3 ± 13.1 GPa and 4.1 ± 1.2 respectively. Mode Grüneisen parameter calculated for all the Raman modes show positive values which indicates the absence of any soft mode in this material. A microscopic mechanism based on bond-charge transfer is invoked and applied to understand the spectroscopic changes occurring in this material which also manifests second order structural phase transition. Enhancement in covalent character of Li-O bonds in the Li-O polyhedra is inferred based on the spectroscopic observation and above mechanism.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142502583","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

Magnetic order in nanogranular iron germanium (Fe_0.53Ge_0.47) films. 纳米粒状铁锗（Fe0.53Ge0.47）薄膜中的磁序。

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2024-11-12 DOI: 10.1088/1361-648X/ad8c0a

Ruthi Zielinski, Nhat Nguyen, Bryce Herrington, Amir Tarkian, Omar Taha, Wai Kiat Chin, Ather Mahmood, Xiaoqian Chen, Christoph Klewe, Padraic Shafer, Jim Ciston, Paul Ashby, Claudio Mazzoli, Robert Streubel

引用次数: 0

From weak- to strong-coupling superconductivity in the AlB₂-type solid solution SrGa_1-xAl_xGe with honeycomb layers. 具有蜂巢层的 AlB2 型固溶体 SrGa1-xAlxGe 中从弱耦合到强耦合的超导性。

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2024-11-12 DOI: 10.1088/1361-648X/ad8c0b

Dorota I Walicka, Olivier Blacque, Tomasz Klimczuk, Fabian O von Rohr

{"title":"From weak- to strong-coupling superconductivity in the AlB2-type solid solution SrGa1-xAlxGe with honeycomb layers.","authors":"Dorota I Walicka, Olivier Blacque, Tomasz Klimczuk, Fabian O von Rohr","doi":"10.1088/1361-648X/ad8c0b","DOIUrl":"10.1088/1361-648X/ad8c0b","url":null,"abstract":"We report on the structure and the superconducting properties of 9-electron 111 compounds with honeycomb layers, namely SrGaGe, SrAlGe, and the SrGa1-xAlxGe solid solution. By means of single-crystal x-ray diffraction we show that, on one hand, SrGaGe crystallizes into the centrosymmetricP6/mmmspace group (a= 4.2555(2) Å,c= 4.7288(2) Å) with statistical disorder in the [GaGe]62-honeycomb layers. On the other hand, we confirm that SrAlGe crystallizes in a non-centrosymmetric space group, namelyP6¯m2(a= 4.2942(1) Å,c= 4.7200(2) Å) with fully ordered [AlGe]62-honeycomb layers. By using magnetization and specific heat measurements, we show that the superconducting properties of SrGaGe and SrAlGe differ significantly from each other. SrGaGe is a superconductor with a critical temperature ofTc= 2.6 K falling into the weak coupling limit, while SrAlGe has aTc= 6.7 K and can be classified in the strong coupling limit. By realizing the SrGa1-xAlxGe solid solution, we were able to investigate the transition between the different crystal structures as well as the evolution of the electronic properties. We show that the transition from the weak-to strong-coupling superconductivity in this system is likely associated with the disorder-to-order transition of the honeycomb layer, along with the loss of the inversion center in the crystal structure.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142522207","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

Vanadium incorporation in 2D-layered MoSe₂. 二维层 MoSe2 中的钒掺入。

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2024-11-11 DOI: 10.1088/1361-648X/ad8abb

João V B Del Piero, Roberto H Miwa, Wanderlã L Scopel

引用次数: 0

Geometry, anomaly, topology, and transport in Weyl fermions. 韦尔费米子的几何、反常、拓扑和传输。

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2024-11-11 DOI: 10.1088/1361-648X/ad8ab9

Azaz Ahmad, Gautham Varma K, Gargee Sharma

{"title":"Geometry, anomaly, topology, and transport in Weyl fermions.","authors":"Azaz Ahmad, Gautham Varma K, Gargee Sharma","doi":"10.1088/1361-648X/ad8ab9","DOIUrl":"10.1088/1361-648X/ad8ab9","url":null,"abstract":"Weyl fermions are one of the simplest objects that link ideas in geometry and topology to high-energy physics and condensed matter physics. Although the existence of Weyl fermions as elementary particles remains dubious, there is mounting evidence of their existence as quasiparticles in certain condensed matter systems. Such systems are termed Weyl semimetals (WSMs). Needless to say, WSMs have emerged as a fascinating class of materials with unique electronic properties, offering a rich playground for both fundamental research and potential technological applications. This review examines recent advancements in understanding electron transport in WSMs. We begin with a pedagogical introduction to the geometric and topological concepts critical to understanding quantum transport in Weyl fermions. We then explore chiral anomaly, a defining feature of WSMs, and its impact on transport phenomena such as longitudinal magnetoconductance and planar Hall effect. The Maxwell-Boltzmann transport theory extended beyond the standard relaxation-time approximation is then discussed in the context of Weyl fermions, which is used to evaluate various transport properties. Attention is also given to the effects of strain-induced gauge fields and external magnetic fields in both time-reversal broken and inversion asymmetric inhomogeneous WSMs. The review synthesizes theoretical insights, experimental observations, and numerical simulations to provide a comprehensive understanding of the complex transport behaviors in WSMs, aiming to bridge the gap between theoretical predictions and experimental verification.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142502594","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

Hot carrier transfer from plasmon decay in Ag₂₀at H-Si(111) surface: real-time TDDFT simulation in Wannier gauge. H-Si(111)表面 Ag20 等离子衰减产生的热载流子转移：万尼尔规中的实时 TDDFT 模拟。

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2024-11-11 DOI: 10.1088/1361-648X/ad8b8e

John L Bost, Christopher Shepard, Yosuke Kanai

引用次数: 0

Tunable electronic and optical properties of BAs/InS heterojunction based on first-principles calculations. 基于第一原理计算的 BAs/InS 异质结的可调谐电子和光学特性。

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2024-11-11 DOI: 10.1088/1361-648X/ad8aba

Qianli Ma, Lei Ni, Duan Li, Yan Zhang

引用次数: 0

LDOS of electron pair and the role of the Pauli exclusion principle. 电子对的 LDOS 和保利排斥原理的作用。

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2024-11-11 DOI: 10.1088/1361-648X/ad912f

Tomasz M Rusin

{"title":"LDOS of electron pair and the role of the Pauli exclusion principle.","authors":"Tomasz M Rusin","doi":"10.1088/1361-648X/ad912f","DOIUrl":"https://doi.org/10.1088/1361-648X/ad912f","url":null,"abstract":"The local density of states (LDOS) for a pair of non-relativistic electrons, inﬂuenced by repulsive Coulomb forces, is expressed in term of one-dimensional integrals over Whittaker functions. The computation of the electron pair's LDOS relies on a two-particle Green's function (GF), a generalization of the one-particle GF applicable to a charged particle in an attractive Coulomb potential. By incorporating electron spins and considering the Pauli exclusion principle, the resulting LDOS consists of two components: one originating from an exchange-even two-particle GF and the other from an exchange-odd two-particle GF. The calculated LDOS reveals its dependence on both inter-electron distance and energy. The pseudo-LDOS, derived from the two-body contribution to the LDOS, is examined. This term ensures complete LDOS suppression at r = 0, exhibiting a limited spatial extent, and the reasons for its emergence are elucidated. It is shown that for energies exceeding the eﬀective Hartree energy and inter-electron distances beyond the eﬀective Bohr radius, the impact of manybody contributions to the LDOS can be disregarded. The induced LDOS for an electron pair subjected to an attractive contact potential in two dimensions is evaluated. At small distances a from the potential center, a predicted relative diﬀerence in LDOS between even and odd state pair reaches approximately 8%. The calculated LDOS is compared with available experimental ﬁndings from a two-dimensional electron gas (2DEG). Both exhibit similar oscillation periods; however, the LDOS of the electron pair decays as 1/a3, signiﬁcantly faster than the 1/a decay observed for free electrons in a 2DEG.&#xD.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142622517","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