arXiv - PHYS - Strongly Correlated Electrons最新文献_第7页

Structure, magnetic properties, and cycloidal spin ordering in Nd-doped BiFeO$_3$ synthesized by sol-gel method 溶胶-凝胶法合成的掺钕 BiFeO$_3$ 的结构、磁性能和环状自旋有序性

arXiv - PHYS - Strongly Correlated Electrons Pub Date : 2024-09-10 DOI: arxiv-2409.06678

K. Komędera, K. Siedliska, Ł. Gondek, D. M. Nalecz, R. Panek, M. Krupska-Klimczak, I. Jankowska Sumara, W. Tokarz, W. Tabiś, T. Pikula

{"title":"Structure, magnetic properties, and cycloidal spin ordering in Nd-doped BiFeO$_3$ synthesized by sol-gel method","authors":"K. Komędera, K. Siedliska, Ł. Gondek, D. M. Nalecz, R. Panek, M. Krupska-Klimczak, I. Jankowska Sumara, W. Tokarz, W. Tabiś, T. Pikula","doi":"arxiv-2409.06678","DOIUrl":"https://doi.org/arxiv-2409.06678","url":null,"abstract":"In this study, the structural and magnetic properties of Nd-doped BiFeO$_3$\u0000materials with the formula Bi$_{1-x}$Nd$_x$FeO$_3$ $(x = 0 - 0.2)$ were\u0000investigated. Samples were prepared using the sol-gel method and annealed at\u0000823 K for 4 hours. Microstructural studies indicated that nanomaterials with an\u0000average grain size of less than 100 nm were produced, with the smallest grain\u0000size observed for the solid solution with $x = 0.15$. Rietveld analysis of\u0000diffraction patterns revealed a composition-driven transformation from the\u0000rhombohedral $(R3c)$ lattice to the orthorhombic $(Pbam)$ structure. The above\u0000finding is correlated to M\"ossbauer spectroscopy data, which demonstrated the\u0000gradual destruction of the spin cycloid due to the structural transformation to\u0000the $Pbam$ structure. The spectra were analyzed using a complex hyperfine\u0000magnetic field distribution model reflecting cycloidal spin ordering. Scanning\u0000differential calorimetry revealed that for the investigated materials the\u0000magnetic ordering temperatures are close to 640 K, independently from the Nd\u0000concentration. Magnetic measurements showed the emergence of weak ferromagnetic\u0000properties with increasing Nd ions concentration, consistently with M\"ossbauer\u0000spectroscopy data.","PeriodicalId":501171,"journal":{"name":"arXiv - PHYS - Strongly Correlated Electrons","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142180458","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

Suppression of the Mott insulating phase in the particle-hole asymmetric Hubbard model 粒子-空穴不对称哈伯德模型中莫特绝缘相的抑制

arXiv - PHYS - Strongly Correlated Electrons Pub Date : 2024-09-10 DOI: arxiv-2409.06674

Mateus Marques, Bruno M. de Souza Melo, Alexandre R. Rocha, Caio Lewenkopf, Luis G. G. V. Dias da Silva

{"title":"Suppression of the Mott insulating phase in the particle-hole asymmetric Hubbard model","authors":"Mateus Marques, Bruno M. de Souza Melo, Alexandre R. Rocha, Caio Lewenkopf, Luis G. G. V. Dias da Silva","doi":"arxiv-2409.06674","DOIUrl":"https://doi.org/arxiv-2409.06674","url":null,"abstract":"We explore the phase diagram of the Mott metal-insulator transition (MIT),\u0000focusing on the effects of particle-hole asymmetry (PHA) in the single-band\u0000Hubbard model. Our dynamical mean-field theory (DMFT) study reveals that the\u0000introduction of PHA in the model significantly influences the critical\u0000temperature ($T_c$) and interaction strength ($U_c$), as well as the size of\u0000the co-existence region of metallic and insulating phases at low temperatures.\u0000Specifically, as the system is moved away from particle-hole symmetry, $T_c$\u0000decreases and $U_c$ increases, indicating a suppression of the insulating phase\u0000and the strengthening of the metallic behavior. Additionally, the first-order\u0000transition line between metallic and insulating phases is better defined in the\u0000model with PHA, leading to a reduced co-existence region at $T<T_c$. Moreover,\u0000we propose that the MIT can be characterized by the charge density, which\u0000serves as a viable alternative to zero-frequency spectral density typically\u0000used in DMFT calculations. Our findings provide new insights into the role of\u0000particle-hole asymmetry in the qualitative and quantitative characterization of\u0000the MIT even in a very simple system.","PeriodicalId":501171,"journal":{"name":"arXiv - PHYS - Strongly Correlated Electrons","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142180427","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

Quantum Oscillations Evidence for Topological Bands in Kagome Metal ScV6Sn6 鹿目金属 ScV6Sn6 中拓扑带的量子振荡证据

arXiv - PHYS - Strongly Correlated Electrons Pub Date : 2024-09-09 DOI: arxiv-2409.05634

Guoxin Zheng, Yuan Zhu, Shirin Mozaffari, Ning Mao, Kuan-Wen Chen, Kaila Jenkins, Dechen Zhang, Aaron Chan, Hasitha W. Suriya Arachchige, Richa P. Madhogaria, Matthew Cothrine, William R. Meier, Yang Zhang, David Mandrus, Lu Li

引用次数: 0

Scalable tensor network algorithm for thermal quantum many-body systems in two dimension 二维热量子多体系统的可扩展张量网络算法

arXiv - PHYS - Strongly Correlated Electrons Pub Date : 2024-09-09 DOI: arxiv-2409.05285

Meng Zhang, Hao Zhang, Chao Wang, Lixin He

引用次数: 0

Signatures of a Quantum Critical Endpoint in the Kitaev Candidate Na$_2$Co$_2$TeO$_6$ 基塔耶夫候选物质 Na$_2$Co$_2$TeO$_6$ 中的量子临界端点特征

arXiv - PHYS - Strongly Correlated Electrons Pub Date : 2024-09-09 DOI: arxiv-2409.05661

J. Arneth, K. -Y. Choi, R. Kalaivanan, R. Sankar, R. Klingeler

引用次数: 0

Charge correlation, doublon-holon binding and screening in the doped Hubbard model 掺杂哈伯德模型中的电荷相关性、双龙束缚和筛分

arXiv - PHYS - Strongly Correlated Electrons Pub Date : 2024-09-09 DOI: arxiv-2409.05640

Edin Kapetanović, Guglielmo Nicola Gigante, Malte Schüler, Tim O. Wehling, Erik van Loon

引用次数: 0

Unveiling Mysteries of GdRu$_2$Si$_2$: The Impact of Interlayer Coupling on The Magnetic Response 揭开 GdRu$_2$Si$_2$ 的神秘面纱：层间耦合对磁响应的影响

arXiv - PHYS - Strongly Correlated Electrons Pub Date : 2024-09-09 DOI: arxiv-2409.06736

Sagar Sarkar, Rohit Pathak, Anna Delin, Olle Eriksson, Vladislav Borisov

{"title":"Unveiling Mysteries of GdRu$_2$Si$_2$: The Impact of Interlayer Coupling on The Magnetic Response","authors":"Sagar Sarkar, Rohit Pathak, Anna Delin, Olle Eriksson, Vladislav Borisov","doi":"arxiv-2409.06736","DOIUrl":"https://doi.org/arxiv-2409.06736","url":null,"abstract":"GdRu$_2$Si$_2$ has recently drawn significant attention as a centrosymmetric\u0000magnet capable of hosting a short period skyrmion square lattice (SkL) in the\u0000absence of Dzyaloshinskii Moriya interaction (DMI). In this system, Gd atoms\u0000are arranged on a square lattice forming 2D layers separated by the Ru-Si\u0000network in the out-of-plane direction. In the low T regime, the ground state\u0000for zero/smaller external magnetic field ($vec{B}_perp$) along the\u0000out-of-plane direction is a single helical state, characterized by one\u0000modulation vector $vec{Q}$ along one of the in-plane directions of the square\u0000lattice. For some critical range of higher $vec{B}_perp$, the helical state\u0000transforms into a SkL state that can be viewed as the overlap of two helical\u0000states defined with $vec{Q}$ vectors in two in-plane directions, with the same\u0000magnitude of $vec{Q}$ as for the single helical state. So far in the\u0000literature, importance has been given to this in-plane $vec{Q}$ vector in\u0000understanding the magnetic phases of the system, considering the out-of-plane\u0000magnetic coupling to be weak, which therefore has been ignored. Our calculation\u0000of the Gd-Gd magnetic exchange interactions ($J_{ij}$) however shows the\u0000strongest $J_{ij}$ to occur between second neighbour Gd atoms along the [111]\u0000body-diagonal direction of the unit cell. This along with the body-centred\u0000tetragonal structure of the Gd sublattice points to the presence of a hitherto\u0000ignored modulation vector, $vec{Q}_{[111]}$, along the [111] direction in the\u0000helical ground state. Atomistic Spin Dynamics (ASD) simulations show the\u0000importance of this interaction. This interlayer modulation vector\u0000$vec{Q}_{[111]}$, along with the intralayer $vec{Q}_{[100]}$, determines the\u0000total magnetic ordering of the system. Our data shows that the magnetic phases\u0000in GdRu$_2$Si$_2$ are far more complex than what has been previously discussed.","PeriodicalId":501171,"journal":{"name":"arXiv - PHYS - Strongly Correlated Electrons","volume":"54 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142180424","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

Dynamics in the nonequilibrium energy landscape of a frustrated Mott insulator 受挫莫特绝缘体的非平衡能谱动力学

arXiv - PHYS - Strongly Correlated Electrons Pub Date : 2024-09-09 DOI: arxiv-2409.05555

Sankha Subhra Bakshi, Tanmoy Mondal, Pinaki Majumdar

{"title":"Dynamics in the nonequilibrium energy landscape of a frustrated Mott insulator","authors":"Sankha Subhra Bakshi, Tanmoy Mondal, Pinaki Majumdar","doi":"arxiv-2409.05555","DOIUrl":"https://doi.org/arxiv-2409.05555","url":null,"abstract":"In a Mott insulator, a laser pulse with frequency tuned to the gap scale can\u0000create a holon-doublon plasma, suppressing the magnetic moment ${vec m}_i$ and\u0000destroying magnetic order. While this disruptive effect is well established\u0000experimentally on a square lattice, we investigate the effect of laser pumping\u0000on the triangular lattice, where geometric frustration leads to a richer set of\u0000ordering possibilities. We work with the Mott-Hubbard problem at a coupling\u0000where $120^{circ}$ order is just stable and employ spatio-temporal mean field\u0000dynamics to study the pump response. Moderate pump amplitude just leads to the\u0000reduction of $120^{circ}$ order, but at larger amplitude the suppression of\u0000$120^{circ}$ order is followed by the appearance of `spiral order'. On the\u0000electronic side the density of `excited carriers' $n_{exc}$ in the upper\u0000Hubbard band increases monotonically with pump amplitude. We show that the long\u0000time ordering possibilities in the pumped system, e.g., the emergence of spiral\u0000order, can be inferred from a nonequilibrium `energy landscape'. We analyse the\u0000growth of spiral order by using an exact diagonalisation based Langevin\u0000equation on large lattices and discover that the new order can take $sim\u000010^3-10^4$ times the electronic timescale to appear. The threefold combination,\u0000of mean field dynamics, landscape construction, and Langevin dynamics, readily\u0000generalises to the search for pump induced `hidden order' in other gapped\u0000systems.","PeriodicalId":501171,"journal":{"name":"arXiv - PHYS - Strongly Correlated Electrons","volume":"135 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142180467","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 evidence of fermionic behavior in the vicinity of one-ninth plateau in a kagome antiferromagnet 卡戈梅反铁磁体九分之一高原附近费米子行为的热力学证据

arXiv - PHYS - Strongly Correlated Electrons Pub Date : 2024-09-09 DOI: arxiv-2409.05600

Guoxin Zheng, Dechen Zhang, Yuan Zhu, Kuan-Wen Chen, Aaron Chan, Kaila Jenkins, Byungmin Kang, Zhenyuan Zeng, Aini Xu, D. Ratkovski, Joanna Blawat, Ali Bangura, John Singleton, Patrick A. Lee, Shiliang Li, Lu Li

{"title":"Thermodynamic evidence of fermionic behavior in the vicinity of one-ninth plateau in a kagome antiferromagnet","authors":"Guoxin Zheng, Dechen Zhang, Yuan Zhu, Kuan-Wen Chen, Aaron Chan, Kaila Jenkins, Byungmin Kang, Zhenyuan Zeng, Aini Xu, D. Ratkovski, Joanna Blawat, Ali Bangura, John Singleton, Patrick A. Lee, Shiliang Li, Lu Li","doi":"arxiv-2409.05600","DOIUrl":"https://doi.org/arxiv-2409.05600","url":null,"abstract":"The spin-1/2 kagome Heisenberg antiferromagnets are believed to host exotic\u0000quantum entangled states. Recently, the report of 1/9 magnetization plateau and\u0000magnetic oscillations in a kagome antiferromagnet\u0000YCu$_3$(OH)$_6$Br$_2$[Br$_x$(OH)$_{1-x}$] (YCOB) have made this material a\u0000promising candidate for experimentally realizing quantum spin liquid states.\u0000Here we present measurements of the specific heat $C_p$ in YCOB in high\u0000magnetic fields (up to 41.5 Tesla) down to 0.46 Kelvin, and the 1/9 plateau\u0000feature has been confirmed. Moreover, the temperature dependence of $C_p/T$ in\u0000the vicinity of 1/9 plateau region can be fitted by a linear in $T$ term which\u0000indicates the presence of a Dirac spectrum, together with a constant term,\u0000which indicates a finite density of states (DOS) contributed by other Fermi\u0000surfaces. Surprisingly the constant term is highly anisotropic in the direction\u0000of the magnetic field. Additionally, we observe a double-peak feature near\u0000$30$~T above the 1/9 plateau which is another hallmark of fermionic excitations\u0000in the specific heat.","PeriodicalId":501171,"journal":{"name":"arXiv - PHYS - Strongly Correlated Electrons","volume":"85 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142180468","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

Large Oscillatory Thermal Hall Effect in Kagome Metals 卡戈米金属中的大振荡热霍尔效应

arXiv - PHYS - Strongly Correlated Electrons Pub Date : 2024-09-09 DOI: arxiv-2409.05621

Dechen Zhang, Kuan-Wen Chen, Guoxin Zheng, Fanghang Yu, Mengzhu Shi, Yuan Zhu, Aaron Chan, Kaila Jenkins, Jianjun Ying, Ziji Xiang, Xianhui Chen, Lu Li

{"title":"Large Oscillatory Thermal Hall Effect in Kagome Metals","authors":"Dechen Zhang, Kuan-Wen Chen, Guoxin Zheng, Fanghang Yu, Mengzhu Shi, Yuan Zhu, Aaron Chan, Kaila Jenkins, Jianjun Ying, Ziji Xiang, Xianhui Chen, Lu Li","doi":"arxiv-2409.05621","DOIUrl":"https://doi.org/arxiv-2409.05621","url":null,"abstract":"The thermal Hall effect recently provided intriguing probes to the ground\u0000state of exotic quantum matters. These observations of transverse thermal Hall\u0000signals lead to the debate on the fermionic versus bosonic origins of these\u0000phenomena. The recent report of quantum oscillations (QOs) in Kitaev spin\u0000liquid points to a possible resolution. The Landau level quantization would\u0000most likely capture only the fermionic thermal transport effect. However, the\u0000QOs in the thermal Hall effect are generally hard to detect. In this work, we\u0000report the observation of a large oscillatory thermal Hall effect of correlated\u0000Kagome metals. We detect a 180-degree phase change of the oscillation and\u0000demonstrate the phase flip as an essential feature for QOs in the thermal\u0000transport properties. More importantly, the QOs in the thermal Hall channel are\u0000more profound than those in the electrical Hall channel, which strongly\u0000violates the Wiedemann Franz (WF) law for QOs. This result presents the\u0000oscillatory thermal Hall effect as a powerful probe to the correlated quantum\u0000materials.","PeriodicalId":501171,"journal":{"name":"arXiv - PHYS - Strongly Correlated Electrons","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142180466","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