Journal of Physics: Condensed Matter最新文献_第10页

The dHvA effect in Sn-doped PbTe topological crystalline insulator.

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2025-02-27 DOI: 10.1088/1361-648X/adb5e5

Duncan Miertschin, Thinh Nguyen, Shengzhi Zhang, Minseong Lee, Sritharan Krishnamoorthi, Rajesh Kumar Ulaganathan, Raman Shankar, David E Graf, Keshav Shrestha

{"title":"The dHvA effect in Sn-doped PbTe topological crystalline insulator.","authors":"Duncan Miertschin, Thinh Nguyen, Shengzhi Zhang, Minseong Lee, Sritharan Krishnamoorthi, Rajesh Kumar Ulaganathan, Raman Shankar, David E Graf, Keshav Shrestha","doi":"10.1088/1361-648X/adb5e5","DOIUrl":"10.1088/1361-648X/adb5e5","url":null,"abstract":"We report the synthesis, electrical transport, magnetotransport, and high-field torque magnetometry studies of the topological crystalline insulator SnxPb1-xTe (x= 0, 0.2, and 0.4). This material undergoes a topological phase transition from trivial to non-trivial at a critical doping ofxc= 0.35. The resistivity increases with applied magnetic field, displaying positive magnetoresistance (MR), which reaches up to 4500% at 14 T for PbTe. However, we did not observe Shubnikov-de Haas oscillations in the MR data. To observe quantum oscillations and explore the Fermi surface topology of this material, we conducted torque magnetometry experiments on samples both below (x= 0.2) and above (x= 0.4) the critical dopingxc= 0.35 with applied magnetic fields up to 35 T. The torque signal from both samples revealed clear de Haas-van Alphen (dHvA) oscillations above 15 T. These oscillations exhibited single dominant frequencies of 90 T forx= 0.2 and 51 T forx= 0.4, providing insights into the Fermi surface properties. Angular and temperature-dependent analyses of the dHvA oscillations were performed using Lifshitz-Kosevich theory to extract key physical parameters of the Fermi surface. Berry phase analysis based on Landau level fan diagrams revealed non-zero values for bothx= 0.2 andx= 0.4, indicating non-trivial topological features. This study provides detailed insights into the quantum oscillations and Fermi surface properties of Sn-doped PbTe/Se compounds, contributing to a deeper understanding of topological crystalline materials and their broader implications for topological physics.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143414153","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

Constructing topological insulator-ferromagnet heterojunctions of Bi₂Se₃/Fe₃GeTe₂and Bi₂Te₃/Fe₃GaTe₂.

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2025-02-27 DOI: 10.1088/1361-648X/adb274

Xinke Liang, Fuhong Chen, Liu Yang, Tingting Yang, Peiyao Xiao, Yuxiang Liu, Zhiwei Wang, Wende Xiao

引用次数: 0

Electromagnetism and thermostability of Cr₇C₃synthesised with high-temperature and high-pressure quenching method.

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2025-02-27 DOI: 10.1088/1361-648X/adaf65

Zekun Yu, Chao Zhou, Kuo Bao, Zhaoqing Wang, Pinwen Zhu, Qiang Tao, Tian Cui

{"title":"Electromagnetism and thermostability of Cr7C3synthesised with high-temperature and high-pressure quenching method.","authors":"Zekun Yu, Chao Zhou, Kuo Bao, Zhaoqing Wang, Pinwen Zhu, Qiang Tao, Tian Cui","doi":"10.1088/1361-648X/adaf65","DOIUrl":"10.1088/1361-648X/adaf65","url":null,"abstract":"The interactions between the carbon skeleton and metal atoms in binary transition metal carbides are of particular interest for industrial applications involving advanced physics and chemistry, especially in magnetoelectric functional materials and cemented carbides. Cr and carbon BTMCs are a series of intermetallic compounds with specific chemical formulas that share certain unique characteristics. In this study, we used polycrystalline powders of chromium and carbon as precursors and synthesised single-phase bulk Cr7C3(orthorhombic, space group:Pnma) with high density and good crystallinity using a high-temperature and high-pressure quenching method (HTHPQM). We studied the material properties and electronic structures of Cr7C3with both experimental measurements and density functional theoryab intiosimulations and found that Cr7C3is a conductor with an electrical conductivity (2.32 × 10-3Ω m), relatively high compaction (97.2%), excellent thermostability (oxidation at 1175 K), and a magnetic phase transition from paramagnetism to soft ferromagnetism around 50 K, and the electromagnetic properties are chiefly due to the abundance of the 3delectrons of Cr, and the orbital hybridisation between C and Cr with their 2pand 3delectrons is the reason for the crystal structure and high thermostability. Therefore, the synthesised Cr7C3is a multifunctional material with promising application prospects, and HPHTQM is a simple and effective method for preparing samples.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143059452","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

Osmotically-induced rupture of viral capsids.

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2025-02-27 DOI: 10.1088/1361-648X/adb46f

Felipe Aguiar, Thiago Colla

{"title":"Osmotically-induced rupture of viral capsids.","authors":"Felipe Aguiar, Thiago Colla","doi":"10.1088/1361-648X/adb46f","DOIUrl":"10.1088/1361-648X/adb46f","url":null,"abstract":"A simple model is proposed aimed to investigate how the amount of dissociated ions influences the mechanical stability of viral capsids. After an osmotic and mechanical equilibrium is established with the outer solution, a non-adiabatic change in salt concentration at the external environment is considered, which results in a significant solvent inflow across the capsid surface, eventually leading to its rupture. The key assumption behind such an osmotic shock mechanism is that solvent flow takes place at timescales much shorter than the ones typical of ionic diffusion. In order to theoretically describe this effect, we herein propose a thermodynamic model based on the traditional Flory theory. The proposed approach is further combined with a continuum Hookian elastic model of surface stretching and pore-opening along the lines of a classical nucleation theory, allowing us to establish the conditions under which capsid mechanical instability takes place. Despite its non-local character, the proposed model is able to capture most of the relevant physical mechanisms controlling capsid stability, namely the volume exclusion and entropy of mixing effects among the densely-packed components, the elastic cost for capsid stretching and further pore opening, the Donnan equilibrium across the interface, as well as the large entropy loss resulting from folding the viral genome into close-packed configurations inside the capsid. It is shown that, depending on the particular combination of initial condition and capsid surface strength, the capsid can either become unstable after removal of a prescribed amount of external salt, or be fully stable against osmotic shock, regardless of the amount of ionic dilution.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143391205","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

Spin-orbit torque in a three-fold-symmetric bilayer and its effect on magnetization dynamics.

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2025-02-27 DOI: 10.1088/1361-648X/adb192

Wuzhang Fang, Edward Schwartz, Alexey A Kovalev, K D Belashchenko

{"title":"Spin-orbit torque in a three-fold-symmetric bilayer and its effect on magnetization dynamics.","authors":"Wuzhang Fang, Edward Schwartz, Alexey A Kovalev, K D Belashchenko","doi":"10.1088/1361-648X/adb192","DOIUrl":"10.1088/1361-648X/adb192","url":null,"abstract":"Field-free switching of perpendicular magnetization has previously been observed in an epitaxial L11-ordered CoPt/CuPt bilayer and attributed to spin-orbit torque (SOT) arising from the crystallographic 3mpoint group of the interface. Using a first-principles nonequilibrium Green's function formalism combined with the Anderson disorder model, we calculate the angular dependence of the SOT in a CoPt/CuPt bilayer and find that the magnitude of the 3mSOT is about 20% of the conventional dampinglike SOT. We further study the magnetization dynamics in perpendicularly magnetized films in the presence of 3mSOT and Dzyaloshinskii-Moriya interaction, using the equations of motion for domain wall dynamics and micromagnetic simulations. For systems where strong interfacial DMI results in the Néel character of domain walls, we find that a very large current density is required to achieve deterministic switching, because reorientation of the magnetization inside the domain wall is necessary to induce the switching asymmetry. For thicker films with relatively weak interfacial DMI and the Bloch character of domain walls, deterministic switching is possible at much smaller current densities, which may explain the recent experimental findings.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143123099","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

Extended Haldane model- a modern gateway to topological insulators.

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2025-02-27 DOI: 10.1088/1361-648X/adb6e9

Tanay Nag, Saptarshi Mandal

引用次数: 0

On the shape of Gaussian scale-free polymer networks.

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2025-02-26 DOI: 10.1088/1361-648X/adb4b6

Viktoria Blavatska, Yurij Holovatch

引用次数: 0

Investigation of MoTe nanowires in honeycomb and kagome lattices: Dirac cones and flat bands. 研究蜂巢和鹿角晶格中的碲镉钼纳米线：狄拉克锥和扁平带

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2025-02-25 DOI: 10.1088/1361-648X/adb5e6

Túlio V de Oliveira, Guilherme A S Ribeiro, Mario S C Mazzoni

引用次数: 0

Edge effects in a planar magnet caused by the impact of an electric field.

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2025-02-25 DOI: 10.1088/1361-648X/adb676

E B Magadeev, R M Vakhitov

引用次数: 0

Inferring traits of hyperuniformity from local structures via persistent homology.

IF 2.3 4区物理与天体物理

Journal of Physics: Condensed Matter Pub Date : 2025-02-20 DOI: 10.1088/1361-648X/adb11b

Abel H G Milor, Marco Salvalaglio

{"title":"Inferring traits of hyperuniformity from local structures via persistent homology.","authors":"Abel H G Milor, Marco Salvalaglio","doi":"10.1088/1361-648X/adb11b","DOIUrl":"10.1088/1361-648X/adb11b","url":null,"abstract":"Hyperuniformity refers to the suppression of density fluctuations at large scales. Typical for ordered systems, this property also emerges in several disordered physical and biological systems, where it is particularly relevant to understand mechanisms of pattern formation and to exploit peculiar attributes, e.g. interaction with light and transport phenomena. While hyperuniformity is a global property, ideally defined for infinitely extended systems, several disordered correlated systems have finite size. It has been shown in Salvalaglioet al(2024Phys. Rev. Res.6023107) that global hyperuniform (HU) characteristics systematically correlate with distributions of topological properties representative of local arrangements. In this work, building on this information, we explore and assess the inverse relationship between hyperuniformity and local structures in point patterns as described by persistent homology. Standard machine learning algorithms trained on persistence diagrams are shown to detect hyperuniformity of periodic point patterns with high accuracy. Therefore, we demonstrate that the information on patterns' local structures allows for characterizing whether finite size arrangements are analogous to those realized in HU patterns. Then, addressing more quantitative aspects, we show that parameters defining hyperuniformity globally can be reconstructed by comparing persistence diagrams of targeted patterns with reference ones. We also explore the generation of patterns entailing given topological properties. The results of this study pave the way for advanced analysis of HU patterns including local information, and introduce basic concepts for their inverse design.","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143074548","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