npj Quantum Materials最新文献

Spin-orbit entangled moments and magnetic exchange interactions in cobalt-based honeycomb magnets BaCo2(XO4)2 (X = P, As, Sb)

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2024-12-02 DOI: 10.1038/s41535-024-00713-8

Subhasis Samanta, Fabrizio Cossu, Heung-Sik Kim

{"title":"Spin-orbit entangled moments and magnetic exchange interactions in cobalt-based honeycomb magnets BaCo2(XO4)2 (X = P, As, Sb)","authors":"Subhasis Samanta, Fabrizio Cossu, Heung-Sik Kim","doi":"10.1038/s41535-024-00713-8","DOIUrl":"https://doi.org/10.1038/s41535-024-00713-8","url":null,"abstract":"Co-based honeycomb magnets have been actively studied recently for the potential realization of emergent quantum magnetism therein such as the Kitaev spin liquid. Here we employ density functional and dynamical mean-field theory methods to examine a family of the Kitaev magnet candidates BaCo2(XO4)2 (X = P, As, Sb), where the compound with X = Sb being not synthesized yet. Our study confirms the formation of Mott insulating phase and the Jeff = 1/2 spin moments at Co2+ sites despite the presence of a sizable amount of trigonal crystal field in all three compounds. The pnictogen substitution from phosphorus to antimony significantly changes the in-plane lattice parameters and direct overlap integral between the neighboring Co ions, leading to the suppression of the Heisenberg interaction. More interestingly, the marginal antiferromagnetic nearest-neighbor Kitaev term changes sign into a ferromagnetic one and becomes sizable at the X = Sb limit. Our study suggests that the pnictogen substitution can be a viable route to continuously tune magnetic exchange interactions and to promote magnetic frustration for the realization of potential spin liquid phases in BaCo2(XO4)2.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"26 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2024-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142758445","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Intrinsic second-order topological insulators in two-dimensional polymorphic graphyne with sublattice approximation

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2024-11-29 DOI: 10.1038/s41535-024-00710-x

Zhongjia Chen, Shaogang Xu, Zijuan Xie, Hu Xu, Hongming Weng

引用次数: 0

Quantum phase transition and composite excitations of antiferromagnetic spin trimer chains in a magnetic field 反铁磁自旋三聚体链在磁场中的量子相变和复合激发

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2024-11-27 DOI: 10.1038/s41535-024-00705-8

Jun-Qing Cheng, Zhi-Yao Ning, Han-Qing Wu, Dao-Xin Yao

{"title":"Quantum phase transition and composite excitations of antiferromagnetic spin trimer chains in a magnetic field","authors":"Jun-Qing Cheng, Zhi-Yao Ning, Han-Qing Wu, Dao-Xin Yao","doi":"10.1038/s41535-024-00705-8","DOIUrl":"https://doi.org/10.1038/s41535-024-00705-8","url":null,"abstract":"Motivated by recent advancements in theoretical and experimental studies of the high-energy excitations on an antiferromagnetic trimer chain, we numerically investigate the quantum phase transition and composite dynamics in this system by applying a magnetic field. The numerical methods we used include the exact diagonalization, density matrix renormalization group, time-dependent variational principle, and cluster perturbation theory. From calculating the entanglement entropy, we have revealed the phase diagram which includes the XY-I, 1/3 magnetization plateau, XY-II, and ferromagnetic phases. Both the critical XY-I and XY-II phases are characterized by the conformal field theory with a central charge c ≃ 1. By analyzing the dynamic spin structure factor, we elucidate the distinct features of spin dynamics across different phases. In the regime with weak intertrimer interaction, we identify the intermediate-energy and high-energy modes in the XY-I and 1/3 magnetization plateau phases as internal trimer excitations, corresponding to the propagating of doublons and quartons, respectively. Notably, applying a magnetic field splits the high-energy spectrum into two branches, labeled as the upper quarton and lower quarton. Furthermore, we explore the spin dynamics of a frustrated trimerized model closely related to the quantum magnet Na2Cu3Ge4O12. In the end, we extend our discuss on the possibility of the quarton Bose-Einstein condensation in the trimer systems. Our results are expected to be further verified through the inelastic neutron scattering and resonant inelastic X-ray scattering, and also provide valuable insights for exploring high-energy exotic excitations.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"25 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142718558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

3D Heisenberg universality in the van der Waals antiferromagnet NiPS3 范德华反铁磁体 NiPS3 中的三维海森堡普遍性

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2024-11-27 DOI: 10.1038/s41535-024-00696-6

Rajan Plumley, Sougata Mardanya, Cheng Peng, Johannes Nokelainen, Tadesse Assefa, Lingjia Shen, Nicholas Burdet, Zach Porter, Alexander Petsch, Aidan Israelski, Hongwei Chen, Jun-Sik Lee, Sophie Morley, Sujoy Roy, Gilberto Fabbris, Elizabeth Blackburn, Adrian Feiguin, Arun Bansil, Wei-Sheng Lee, Aaron M. Lindenberg, Sugata Chowdhury, Mike Dunne, Joshua J. Turner

{"title":"3D Heisenberg universality in the van der Waals antiferromagnet NiPS3","authors":"Rajan Plumley, Sougata Mardanya, Cheng Peng, Johannes Nokelainen, Tadesse Assefa, Lingjia Shen, Nicholas Burdet, Zach Porter, Alexander Petsch, Aidan Israelski, Hongwei Chen, Jun-Sik Lee, Sophie Morley, Sujoy Roy, Gilberto Fabbris, Elizabeth Blackburn, Adrian Feiguin, Arun Bansil, Wei-Sheng Lee, Aaron M. Lindenberg, Sugata Chowdhury, Mike Dunne, Joshua J. Turner","doi":"10.1038/s41535-024-00696-6","DOIUrl":"https://doi.org/10.1038/s41535-024-00696-6","url":null,"abstract":"Van der Waals (vdW) magnetic materials are comprised of layers of atomically thin sheets, making them ideal platforms for studying magnetism at the two-dimensional (2D) limit. These materials are at the center of a host of novel types of experiments, however, there are notably few pathways to directly probe their magnetic structure. We confirm the magnetic order within a single crystal of NiPS3 and show it can be accessed with resonant elastic X-ray diffraction along the edge of the vdW planes in a carefully grown crystal by detecting structurally forbidden resonant magnetic X-ray scattering. We find the magnetic order parameter has a critical exponent of β ~ 0.36, indicating that the magnetism of these vdW crystals is more adequately characterized by the three-dimensional (3D) Heisenberg universality class. We verify these findings with first-principles density functional theory, Monte-Carlo simulations, and density matrix renormalization group calculations.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"63 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142718559","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Multinode quantum spin liquids in extended Kitaev honeycomb models 扩展基塔耶夫蜂巢模型中的多节点量子自旋液体

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2024-11-26 DOI: 10.1038/s41535-024-00704-9

Jiucai Wang, B. Normand, Zheng-Xin Liu

引用次数: 0

Phase sensitive information from a planar Josephson junction 平面约瑟夫森结的相位敏感信息

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2024-11-25 DOI: 10.1038/s41535-024-00707-6

Andrew C. Yuan, Steven A. Kivelson

引用次数: 0

Realization of a classical Ruddlesden Popper type bilayer nickelate in Sr3Ni2−xAlxO7−δ with unusual Ni4+ 在 Sr3Ni2-xAlxO7-δ 中实现具有不寻常 Ni4+ 的经典 Ruddlesden Popper 型双层镍酸盐

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2024-11-22 DOI: 10.1038/s41535-024-00708-5

Hasan Yilmaz, Kathrin Küster, Ulrich Starke, Oliver Clemens, Masahiko Isobe, Pascal Puphal

引用次数: 0

Probing p-wave superconductivity in UTe2 via point-contact junctions 通过点接触结探测 UTe2 中的 p 波超导性

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2024-11-15 DOI: 10.1038/s41535-024-00700-z

Hyeok Yoon, Yun Suk Eo, Jihun Park, Jarryd A. Horn, Ryan G. Dorman, Shanta R. Saha, Ian M. Hayes, Ichiro Takeuchi, Philip M. R. Brydon, Johnpierre Paglione

引用次数: 0

Floquet engineering of anomalous Hall effects in monolayer MoS2 单层 MoS2 中反常霍尔效应的 Floquet 工程学

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2024-11-14 DOI: 10.1038/s41535-024-00702-x

Haijun Cao, Jia-Tao Sun, Sheng Meng

引用次数: 0

Optical properties and electronic correlations in La3Ni2O7 bilayer nickelates under high pressure 高压下 La3Ni2O7 双层镍酸盐的光学特性和电子相关性

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2024-11-14 DOI: 10.1038/s41535-024-00690-y

Benjamin Geisler, Laura Fanfarillo, James J. Hamlin, Gregory R. Stewart, Richard G. Hennig, P. J. Hirschfeld

{"title":"Optical properties and electronic correlations in La3Ni2O7 bilayer nickelates under high pressure","authors":"Benjamin Geisler, Laura Fanfarillo, James J. Hamlin, Gregory R. Stewart, Richard G. Hennig, P. J. Hirschfeld","doi":"10.1038/s41535-024-00690-y","DOIUrl":"https://doi.org/10.1038/s41535-024-00690-y","url":null,"abstract":"We explore the optical properties of La3Ni2O7 bilayer nickelates by using density functional theory including a Coulomb repulsion term. Convincing agreement with recent experimental ambient-pressure spectra is achieved for U ~ 3 eV, which permits tracing the microscopic origin of the characteristic features. Simultaneous consistency with angle-resolved photoemission spectroscopy and x-ray diffraction suggests the notion of rather moderate electronic correlations in this novel high-Tc superconductor. Oxygen vacancies form predominantly at the inner apical sites and renormalize the optical spectrum quantitatively, while the released electrons are largely accommodated by a defect state. We show that the structural transition occurring under high pressure coincides with a significant enhancement of the Drude weight and a reduction of the out-of-plane interband contribution that acts as a fingerprint of the emerging hole pocket. We further calculate the optical spectra for various possible magnetic phases including spin-density waves and discuss the results in the context of experiment. Finally, we investigate the role of the 2–2 versus 1–3 layer stacking and compare the bilayer nickelate to La4Ni3O10, La3Ni2O6, and NdNiO2, unveiling general trends in the optical spectrum as a function of the formal Ni valence in Ruddlesden–Popper versus reduced Ruddlesden–Popper nickelates.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"40 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142637133","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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