Journal of physics. Condensed matter : an Institute of Physics journal最新文献

Anomalous thermal activation of the electron glass dynamics in a-InOx and granular aluminum. a-InOx和颗粒铝中电子玻璃动力学的异常热活化。

Journal of physics. Condensed matter : an Institute of Physics journal Pub Date : 2025-07-25 DOI: 10.1088/1361-648X/adeef7

T Grenet, J Delahaye

{"title":"Anomalous thermal activation of the electron glass dynamics in a-InOx and granular aluminum.","authors":"T Grenet, J Delahaye","doi":"10.1088/1361-648X/adeef7","DOIUrl":"10.1088/1361-648X/adeef7","url":null,"abstract":"In this article, we explore the temperature dependence of the electrical glassy dynamics in insulating amorphous indium oxide (a-InOx) and granular Al films. We use non-isothermal gate voltage protocols, which can reveal changes in the dynamics induced by the temperature, when logarithmic relaxations devoid of characteristic times are at work. We demonstrate that, contrary to almost 20 years of opposite belief, the dynamics of amorphous indium oxide films in the liquid helium temperature range is thermally activated, i.e. it slows down under cooling and accelerates upon heating. Amorphous indium oxide thus adds to the list of glassy disordered systems in which we already demonstrated thermal activation, which includes granular Al and amorphous NbxSi1-xfilms. Moreover, measurements up to 40 K in a-InOxand granular Al films reveal the close similarity between the two systems and a very anomalous character of the thermal activation, with an effective activation energy increasing withTasT2. We so far have no explanation for it. Its further study and understanding may be important for the physics of electron glasses.","PeriodicalId":520686,"journal":{"name":"Journal of physics. Condensed matter : an Institute of Physics journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144621712","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ultrafast nonlinear absorption of Haldane model quantum dots. Haldane模型量子点的超快非线性吸收。

Journal of physics. Condensed matter : an Institute of Physics journal Pub Date : 2025-07-25 DOI: 10.1088/1361-648X/adf0d1

Krishna Rana Magar, Vadym Apalkov

引用次数: 0

The anomalous density of states and quasi-localized vibration through homogeneous thermalization of an inhomogeneous elastic system. 非均匀弹性系统的反常态密度与均匀热化的准局域振动。

Journal of physics. Condensed matter : an Institute of Physics journal Pub Date : 2025-07-25 DOI: 10.1088/1361-648X/adf0d3

Cunyuan Jiang

{"title":"The anomalous density of states and quasi-localized vibration through homogeneous thermalization of an inhomogeneous elastic system.","authors":"Cunyuan Jiang","doi":"10.1088/1361-648X/adf0d3","DOIUrl":"10.1088/1361-648X/adf0d3","url":null,"abstract":"Amorphous solids exhibit dynamic inhomogeneity due to their lack of translational symmetry, leading to distinct vibrational properties compared to crystalline solids. These include anomalous low-frequency vibrational density of states (VDOS) and associated deviations in low-temperature thermal behavior. While particle-level investigations have advanced rapidly, a fundamental interpretation of these phenomena based on physical laws remains underdeveloped. In this work, we begin with the quasi-equilibrium condition, which mandates a homogeneous distribution of elastic potential energy in an inhomogeneous elastic solid over long timescales. The analytical results suggest that the anomalous low-frequency VDOS scalingD(ω)∝ω4emerges when quasi-equilibrium is imposed on an elastically inhomogeneous system. At higher frequencies, beyond a crossover dictated by the length scale of inhomogeneity, the VDOS transitions toD(ω)∝ω2, consistent with Debye's law for crystals. These findings align with recent particle-level studies and suggests that the universal low-frequency anomaly in amorphous solids arises from homogeneous thermalization.","PeriodicalId":520686,"journal":{"name":"Journal of physics. Condensed matter : an Institute of Physics journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144652060","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Deciphering temperature-driven magnetic transformations and canting mechanism in the Y3Fe5-xCdXO12 compound: a coupled molecular field and phenomenological analysis. 解析Y3Fe5-xCdXO12化合物中温度驱动的磁转换和倾斜机制：耦合分子场和现象学分析。

Journal of physics. Condensed matter : an Institute of Physics journal Pub Date : 2025-07-24 DOI: 10.1088/1361-648X/adf3a2

J Matilla-Arias, Fidel Guerrero, Yuset Guerra Davila, Adolfo Franco Junior, Eduardo Padrón Hernández, Ramón Raudel Peña-Garcia

{"title":"Deciphering temperature-driven magnetic transformations and canting mechanism in the Y3Fe5-xCdXO12 compound: a coupled molecular field and phenomenological analysis.","authors":"J Matilla-Arias, Fidel Guerrero, Yuset Guerra Davila, Adolfo Franco Junior, Eduardo Padrón Hernández, Ramón Raudel Peña-Garcia","doi":"10.1088/1361-648X/adf3a2","DOIUrl":"https://doi.org/10.1088/1361-648X/adf3a2","url":null,"abstract":"In this study, the Y3Fe5-xCdxO12 compounds were synthesized via the sol-gel method for Cd doping levels of x = 0.00, 0.01, 0.03, 0.05, and 0.07. X-ray diffraction analysis revealed that the single YIG phase is maintained at 100% for x = 0.00 and 0.01, while minor secondary CdO phases are detected at higher doping levels, 0.13% for x = 0.03, 1.17% for x = 0.05, and 4.42% for x = 0.07. Concurrently, the lattice parameter increased from 12.3808 A (x = 0.00) to 12.4012 A (x = 0.07), and the unit cell volume expanded from 1897.8 A3 to 1907.4 A3, reflecting the incorporation of some Cd2+ ions in place of Fe3+. Magnetic measurements performed between 100 K and 300 K indicated a systematic decrease in saturation magnetization with increasing temperature. The experimental Ms values, determined by fitting the high-field data with the Law of Approach to Saturation, were quantitatively reproduced using a coupled theoretical model that integrates Dionne's modifications to the molecular field coefficients with a phenomenological analysis of cation distribution. The relevance of coupling the models lies in the dependence of the molecular field coefficients on cation distribution, which is critical for accurately calculating the saturation magnetization and understanding the underlying physical mechanisms. Remarkably, considering magnetic moment canting resulted in a maximum relative deviation of only 7.50% from experimental values, compared to discrepancies as high as 38.7% when assuming a collinear arrangement of magnetic moments. The preferential occupancy of Cd2+ in octahedral sites, with an occupation probability seven orders of magnitude greater than in tetrahedral sites, further underlines its role in modulating the net magnetic moment.","PeriodicalId":520686,"journal":{"name":"Journal of physics. Condensed matter : an Institute of Physics journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144700944","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhancing intrinsic spin Hall effect: insights into chiral crystals and topological materials. 增强本征自旋霍尔效应：对手性晶体和拓扑材料的见解。

Journal of physics. Condensed matter : an Institute of Physics journal Pub Date : 2025-07-24 DOI: 10.1088/1361-648X/adeef0

Ali Dehghan, Jiali Chen, Wei Jiang

{"title":"Enhancing intrinsic spin Hall effect: insights into chiral crystals and topological materials.","authors":"Ali Dehghan, Jiali Chen, Wei Jiang","doi":"10.1088/1361-648X/adeef0","DOIUrl":"10.1088/1361-648X/adeef0","url":null,"abstract":"This review presents a comprehensive analysis of recent advances in enhancing the intrinsic spin Hall effect (SHE) in emergent quantum materials, including chiral crystals and topological materials, by leveraging their shared symmetry-breaking features and spin-orbit coupling (SOC)-driven phenomena. The SHE, a transformative mechanism for magnetic-field-free charge-to-spin interconversion, lies at the heart of energy-efficient spintronics. Chiral crystals, with their inherent structural handedness and broken inversion symmetry, synergize with topological materials-such as Weyl semimetals and insulators-to amplify SHE through distinct yet complementary mechanisms. These include chiral spin textures, Weyl/Dirac fermions, band-inversion-induced Berry curvature hotspots, and protected surface or hinge states, all governed by strong SOC and unique spin-momentum locking. We systematically analyze how the interplay of symmetry, topology, and electronic structure in these materials creates unprecedented opportunities for SHE enhancement, supported by breakthroughs in computational design (e.g.ab initioBerry curvature engineering) and experimental strategies such as strain, alloying, and heterostructuring. Critical challenges, including the SOC-diffusion length trade-off and the need to harness magnetic or low-symmetry phases, are discussed in the context of material optimization. By unifying insights from chiral and topological systems, this review charts a roadmap for transcending conventional spin current generation paradigms and advancing scalable spintronic technologies.","PeriodicalId":520686,"journal":{"name":"Journal of physics. Condensed matter : an Institute of Physics journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144621713","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Role of interface mixing on coherent heat conduction in periodic and aperiodic superlattices. 周期和非周期超晶格中界面混合对相干热传导的影响。

Journal of physics. Condensed matter : an Institute of Physics journal Pub Date : 2025-07-23 DOI: 10.1088/1361-648X/adf36b

Theodore Maranets, Evan Wallace Doe, Yan Wang

{"title":"Role of interface mixing on coherent heat conduction in periodic and aperiodic superlattices.","authors":"Theodore Maranets, Evan Wallace Doe, Yan Wang","doi":"10.1088/1361-648X/adf36b","DOIUrl":"https://doi.org/10.1088/1361-648X/adf36b","url":null,"abstract":"Superlattices (SLs) can induce phonon coherence through the periodic layering of two or more materials, enabling tailored thermal transport properties. While most theoretical studies assume atomically sharp, perfect interfaces, real SLs often feature atomic interdiffusion spanning approximately a single atomic layer or more. Such interface mixing can significantly influence phonon coherence and transport behavior. In this study, we employ atomistic wave-packet simulations to systematically investigate the effects of interface mixing on coherent heat conduction. Our analysis identifies two competing mechanisms that govern phonon transport across mixed interfaces: (1) Interface mixing disrupts coherent mode-conversion effects arising from the interface arrangement. (2) The disorder enhances the potential for interference events, generating additional coherent phonon transport pathways. The second mechanism enhances the transmission of Bragg-reflected modes in periodic SLs and most phonons in aperiodic SLs, which otherwise lack coherent mode-conversion in perfect structures. Conversely, the first mechanism dominates in periodic SLs for non-Bragg-reflected modes, where transmission is already high due to substantial mode-conversion. These findings provide insights into the interplay between interface imperfections and phonon coherence.","PeriodicalId":520686,"journal":{"name":"Journal of physics. Condensed matter : an Institute of Physics journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144700946","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Exploration of surface oriented altermagnetic states in CrTe, FeSb₂and MnO₂: a first-principles study. CrTe， fesb2和MnO2表面取向的互磁态探索：第一性原理研究。

Journal of physics. Condensed matter : an Institute of Physics journal Pub Date : 2025-07-23 DOI: 10.1088/1361-648X/adeef6

Apeksha Gauswami, Prafulla K Jha

{"title":"Exploration of surface oriented altermagnetic states in CrTe, FeSb2and MnO2: a first-principles study.","authors":"Apeksha Gauswami, Prafulla K Jha","doi":"10.1088/1361-648X/adeef6","DOIUrl":"10.1088/1361-648X/adeef6","url":null,"abstract":"The present work explores the influence of altermagnetism (AM) on the electronic structure of materials, specifically focusing on the emergence of non-relativistic spin splitting. We demonstrate that thek-path dependence of altermagnetic spin splitting in the 3D Brillouin zone exhibits distinct altermagnetic surface states due to specific surface orientations. We considered three types of crystal systems (hexagonal, orthorhombic and tetragonal), to unveil the altermagnetic properties of these surface states. We calculated the two-dimensional projected Brillouin zones from the bulk and analyzed the interaction between these surface Brillouin zones and the k-dependent spin splitting. This analysis identifies the surfaces where opposite-sign spin splitting merges, nullifying AM and the surfaces where AM is preserved. Our investigation across the three principal surface orientations reveals that for several cases, two surfaces exhibit blindness to the AM, while the remaining surface retains altermagnetic properties. This dependence on surface orientation is further influenced by the specific magnetic order within the material. Finally, we demonstrate that the density of states of the majority and minority spins then governs the tunneling magnetoresistance. Additionally, we have calculated a anomalous Hall conductivity within density functional theory. Therefore, our work provides a framework for understanding and tailoring surface related AM, paving the way for potential applications in spintronics and modern quantum techniques.","PeriodicalId":520686,"journal":{"name":"Journal of physics. Condensed matter : an Institute of Physics journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144621714","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Transport through a nodal surface semimetal-superconductor junction in absence/presence of light irradiation. 在没有/存在光照射的情况下通过节点表面半金属-超导体结的输运。

Journal of physics. Condensed matter : an Institute of Physics journal Pub Date : 2025-07-23 DOI: 10.1088/1361-648X/adefa8

Bhaskar Pandit, Satyaki Kar

{"title":"Transport through a nodal surface semimetal-superconductor junction in absence/presence of light irradiation.","authors":"Bhaskar Pandit, Satyaki Kar","doi":"10.1088/1361-648X/adefa8","DOIUrl":"10.1088/1361-648X/adefa8","url":null,"abstract":"We study quantum tunneling vias-wave superconductor (SC) junction with a topologically charged nodal surface semimetal (NSSM) where a nonsymmorphic symmetry forces the nodal surfaces to stick to the Brillouin zone boundary. Due to their unique dispersions close to the two dimensional band crossing, the charge carriers in the NSSM display many unorthodox behavior in the nature of Andreev as well as normal reflections at the SC junction interface. We investigate such behaviors for different incident orientations for both subgap and supergap energies where monotonic decays/rises of reflectance with incident energy or angle of incidences are often not followed. We also consider irradiation via light with circular and linear polarization on such systems following a Floquet approach in the limit of high frequency irradiation and probe the stroboscopic temporal evolution of the transport parameters. Our results indicate many nontrivial Andreev transport features including near-depletion of the subgap conductivities. All these nontrivialities can be tested in a cold atom set-up on optical lattices and well experimented for quantum information processing purpose.","PeriodicalId":520686,"journal":{"name":"Journal of physics. Condensed matter : an Institute of Physics journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144639576","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

From order to disorder: magnetic phase evolution of diluted triangular lattice Ba3CoNb2O9. 从有序到无序：稀释三角形晶格Ba3CoNb2O9的磁相演化。

Journal of physics. Condensed matter : an Institute of Physics journal Pub Date : 2025-07-23 DOI: 10.1088/1361-648X/adf36a

Akhil N, Dheeraj Ranaut, Sharath Kumar Channarayappa, Deepshikha Jaiswal-Nagar

{"title":"From order to disorder: magnetic phase evolution of diluted triangular lattice Ba3CoNb2O9.","authors":"Akhil N, Dheeraj Ranaut, Sharath Kumar Channarayappa, Deepshikha Jaiswal-Nagar","doi":"10.1088/1361-648X/adf36a","DOIUrl":"https://doi.org/10.1088/1361-648X/adf36a","url":null,"abstract":"Magnetic lattice dilution in geometrically frustrated systems provides a platform to investigate the presence of unconventional magnetic phases as the dilution is expected to destabilize the conventional magnetic order and creates randomness in exchange interactions. In this context, we have investigated the impact of non-magnetic Zn2+ doping on an effective spin (Jeff) - ½ geometrically frustrated triangular lattice Ba3CoNb2O9. The successful formation of pure single phase and preservation of crystal symmetry is confirmed via X-ray diffraction studies. Magnetic susceptibility measurements confirm the persistence of Jeff = ½ state, along with the suppression of antiferromagnetic (AFM) ordering with the critical concentration (xc = 0.4) corresponding to disordered state. This transition from AFM to disordered state above x = 0.4 is further confirmed from isothermal magnetization (M (H)). Along with this, a field-induced transition identical to a spin-flop transition is observed in the saturation region of M (H) curves which become more dominant for higher concentration. The dilution of magnetic lattice results in randomness in exchange interactions with reduced AFM coupling between the spins which lowers the energy barrier for spin reorientation and gives rise to these unique spin-flop transitions. Our results highlight the role of magnetic dilution in tuning the balance between frustration and exchange interactions, offering insight into such field-driven behavior of quantum magnets.&#xD.","PeriodicalId":520686,"journal":{"name":"Journal of physics. Condensed matter : an Institute of Physics journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144700945","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thermodynamic and magnetic properties of a particle in a polar quantum disc with conical disclination in the presence of magnetic field. 在磁场存在下，具有锥形旋向的极量子盘中粒子的热力学和磁性。

Journal of physics. Condensed matter : an Institute of Physics journal Pub Date : 2025-07-23 DOI: 10.1088/1361-648X/adeb29

Vinod Kumar, Surender Pratap, Moletlanyi Tshipa

{"title":"Thermodynamic and magnetic properties of a particle in a polar quantum disc with conical disclination in the presence of magnetic field.","authors":"Vinod Kumar, Surender Pratap, Moletlanyi Tshipa","doi":"10.1088/1361-648X/adeb29","DOIUrl":"10.1088/1361-648X/adeb29","url":null,"abstract":"In this study, we explore the thermodynamic and magnetic properties of a non-interacting, spinless charged particle confined by a parabolic potential within a polar quantum disc featuring a conical disclination, subject to a uniform magnetic fieldB. The central theme of this investigation is to explore the impact of a topological defect, namely the conical disclination, on the system's thermodynamic and magnetic properties. The disclination of the system is characterized by kink parameterκ. The thermodynamic and magnetic characteristics of the system are assessed using the canonical formalism. The energy spectrum of the system consisting of non-interacting spinless charged particles is derived by solving the Schrödinger equation using the effective mass approximation. It is found that the energy of the system decreases with an increase in theκ, owing to the weakening of confinement. Increasing the value of theκincreases the internal energy (U), entropy (S) while decreasing the heat capacity (Cv). Moreover, the increasing value ofκcauses to reduce the magnetization (M) and magnetic susceptibility (χm).","PeriodicalId":520686,"journal":{"name":"Journal of physics. Condensed matter : an Institute of Physics journal","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144556523","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0