npj Quantum Materials最新文献_第10页

New insight into tuning magnetic phases of RMn6Sn6 kagome metals 调谐 RMn6Sn6 神龟金属磁性相的新见解

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2024-05-20 DOI: 10.1038/s41535-024-00656-0

S. X. M. Riberolles, Tianxiong Han, Tyler J. Slade, J. M. Wilde, A. Sapkota, Wei Tian, Qiang Zhang, D. L. Abernathy, L. D. Sanjeewa, S. L. Bud’ko, P. C. Canfield, R. J. McQueeney, B. G. Ueland

{"title":"New insight into tuning magnetic phases of RMn6Sn6 kagome metals","authors":"S. X. M. Riberolles, Tianxiong Han, Tyler J. Slade, J. M. Wilde, A. Sapkota, Wei Tian, Qiang Zhang, D. L. Abernathy, L. D. Sanjeewa, S. L. Bud’ko, P. C. Canfield, R. J. McQueeney, B. G. Ueland","doi":"10.1038/s41535-024-00656-0","DOIUrl":"https://doi.org/10.1038/s41535-024-00656-0","url":null,"abstract":"Predicting magnetic ordering in kagome compounds offers the possibility of harnessing topological or flat-band physical properties through tuning of the magnetism. Here, we examine the magnetic interactions and phases of ErMn6Sn6 which belongs to a family of RMn6Sn6, R = Sc, Y, Gd–Lu, compounds with magnetic kagome Mn layers, triangular R layers, and signatures of topological properties. Using results from single-crystal neutron diffraction and mean-field analysis, we find that ErMn6Sn6 sits close to the critical boundary separating the spiral-magnetic and ferrimagnetic ordered states typical for non-magnetic versus magnetic R layers, respectively. Finding interlayer magnetic interactions and easy-plane Mn magnetic anisotropy consistent with other members of the family, we predict the existence of a number of temperature and field dependent collinear, noncollinear, and noncoplanar magnetic phases. We show that thermal fluctuations of the Er magnetic moment, which act to weaken the Mn-Er interlayer magnetic interaction and quench the Er magnetic anisotropy, dictate magnetic phase stability. Our results provide a starting point and outline a multitude of possibilities for studying the behavior of Dirac fermions in RMn6Sn6 compounds with control of the Mn spin orientation and real-space spin chirality.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"2 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2024-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141073849","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

Large anomalous Hall effect in spin fluctuating devil’s staircase 自旋波动魔鬼阶梯中的大反常霍尔效应

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2024-05-17 DOI: 10.1038/s41535-024-00653-3

Naoki Abe, Yuya Hano, Hiroaki Ishizuka, Yusuke Kozuka, Terumasa Tadano, Yoshihiro Tsujimoto, Kazunari Yamaura, Shintaro Ishiwata, Jun Fujioka

引用次数: 0

Thermal evolution of spin excitations in honeycomb Ising antiferromagnetic FePSe3 蜂窝状 Ising 反铁磁性 FePSe3 中自旋激发的热演化

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2024-05-13 DOI: 10.1038/s41535-024-00651-5

Lebing Chen, Xiaokun Teng, Ding Hu, Feng Ye, Garrett E. Granroth, Ming Yi, Jae-Ho Chung, Robert J. Birgeneau, Pengcheng Dai

{"title":"Thermal evolution of spin excitations in honeycomb Ising antiferromagnetic FePSe3","authors":"Lebing Chen, Xiaokun Teng, Ding Hu, Feng Ye, Garrett E. Granroth, Ming Yi, Jae-Ho Chung, Robert J. Birgeneau, Pengcheng Dai","doi":"10.1038/s41535-024-00651-5","DOIUrl":"https://doi.org/10.1038/s41535-024-00651-5","url":null,"abstract":"We use elastic and inelastic neutron scattering (INS) to study the antiferromagnetic (AF) phase transitions and spin excitations in the two-dimensional (2D) zig-zag antiferromagnet FePSe3. By determining the magnetic order parameter across the AF phase transition, we conclude that the AF phase transition in FePSe3 is first-order in nature. In addition, our INS measurements reveal that the spin waves in the AF ordered state have a large easy-axis magnetic anisotropy gap, consistent with an Ising Hamiltonian, and possible biquadratic magnetic exchange interactions. On warming across TN, we find that dispersive spin excitations associated with three-fold rotational symmetric AF fluctuations change into FM spin fluctuations above TN. These results suggest that the first-order AF phase transition in FePSe3 may arise from the competition between C3 symmetric AF and C1 symmetric FM spin fluctuations around TN, in place of a conventional second-order AF phase transition.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"34 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2024-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140919747","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

Structural transitions, octahedral rotations, and electronic properties of A3Ni2O7 rare-earth nickelates under high pressure 高压下 A3Ni2O7 稀土镍酸盐的结构转变、八面体旋转和电子特性

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2024-04-26 DOI: 10.1038/s41535-024-00648-0

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

{"title":"Structural transitions, octahedral rotations, and electronic properties of A3Ni2O7 rare-earth nickelates under high pressure","authors":"Benjamin Geisler, James J. Hamlin, Gregory R. Stewart, Richard G. Hennig, P. J. Hirschfeld","doi":"10.1038/s41535-024-00648-0","DOIUrl":"https://doi.org/10.1038/s41535-024-00648-0","url":null,"abstract":"Motivated by the recent observation of superconductivity with Tc ~ 80 K in pressurized La3Ni2O71, we explore the structural and electronic properties of A3Ni2O7 bilayer nickelates (A = La-Lu, Y, Sc) as a function of pressure (0–150 GPa) from first principles including a Coulomb repulsion term. At ~ 20 GPa, we observe an orthorhombic-to-tetragonal transition in La3Ni2O7 at variance with x-ray diffraction data, which points to so-far unresolved complexities at the onset of superconductivity, e.g., charge doping by variations in the oxygen stoichiometry. We compile a structural phase diagram that establishes chemical and external pressure as distinct and counteracting control parameters. We find unexpected correlations between Tc and the in-plane Ni-O-Ni bond angles for La3Ni2O7. Moreover, two structural phases with significant c+ octahedral rotations and in-plane bond disproportionations are uncovered for A = Nd-Lu, Y, Sc that exhibit a pressure-driven electronic reconstruction in the Ni eg manifold. By disentangling the involvement of basal versus apical oxygen states at the Fermi surface, we identify Tb3Ni2O7 as an interesting candidate for superconductivity at ambient pressure. These results suggest a profound tunability of the structural and electronic phases in this novel materials class and are key for a fundamental understanding of the superconductivity mechanism.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"8 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2024-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140651723","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

Atomic-scale magnetic doping of monolayer stanene by revealing Kondo effect from self-assembled Fe spin entities 通过揭示自组装铁自旋实体的近藤效应，在原子尺度上对单层链烯进行磁性掺杂

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2024-04-12 DOI: 10.1038/s41535-024-00647-1

Nitin Kumar, Ye-Shun Lan, Iksu Jang, Yen-Hui Lin, Chia-Ju Chen, Tzu-Hsuan Lin, Horng-Tay Jeng, Po-Yao Chang, Pin-Jui Hsu

{"title":"Atomic-scale magnetic doping of monolayer stanene by revealing Kondo effect from self-assembled Fe spin entities","authors":"Nitin Kumar, Ye-Shun Lan, Iksu Jang, Yen-Hui Lin, Chia-Ju Chen, Tzu-Hsuan Lin, Horng-Tay Jeng, Po-Yao Chang, Pin-Jui Hsu","doi":"10.1038/s41535-024-00647-1","DOIUrl":"https://doi.org/10.1038/s41535-024-00647-1","url":null,"abstract":"Atomic-scale spin entity in a two-dimensional topological insulator lays the foundation to manufacture magnetic topological materials with single atomic thickness. Here, we have successfully fabricated Fe monomer, dimer and trimer doped in the monolayer stanene/Cu(111) through a low-temperature growth and systematically investigated Kondo effect by combining scanning tunneling microscopy/spectroscopy (STM/STS) with density functional theory (DFT) and numerical renormalization group (NRG) method. Given high spatial and energy resolution, tunneling conductance (dI/dU) spectra have resolved zero-bias Kondo resonance and resultant magnetic-field-dependent Zeeman splitting, yielding an effective spin Seff = 3/2 with an easy-plane magnetic anisotropy on the self-assembled Fe atomic dopants. Reduced Kondo temperature along with attenuated Kondo intensity from Fe monomer to trimer have been further identified as a manifestation of Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction between Sn-separated Fe atoms. Such magnetic Fe atom assembly in turn constitutes important cornerstones for tailoring topological band structures and developing magnetic phase transition in the single-atom-layer stanene.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"30 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2024-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140550386","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

Charge transfer and spin-valley locking in 4Hb-TaS2 4Hb-TaS2 中的电荷转移和自旋谷锁定

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2024-04-10 DOI: 10.1038/s41535-024-00646-2

Avior Almoalem, Roni Gofman, Yuval Nitzav, Ilay Mangel, Irena Feldman, Jahyun Koo, Federico Mazzola, Jun Fujii, Ivana Vobornik, J. S´anchez-Barriga, Oliver J. Clark, Nicholas Clark Plumb, Ming Shi, Binghai Yan, Amit Kanigel

{"title":"Charge transfer and spin-valley locking in 4Hb-TaS2","authors":"Avior Almoalem, Roni Gofman, Yuval Nitzav, Ilay Mangel, Irena Feldman, Jahyun Koo, Federico Mazzola, Jun Fujii, Ivana Vobornik, J. S´anchez-Barriga, Oliver J. Clark, Nicholas Clark Plumb, Ming Shi, Binghai Yan, Amit Kanigel","doi":"10.1038/s41535-024-00646-2","DOIUrl":"https://doi.org/10.1038/s41535-024-00646-2","url":null,"abstract":"4Hb-TaS2 is a superconductor that exhibits unique characteristics such as time-reversal symmetry breaking, hidden magnetic memory, and topological edge modes. It is a naturally occurring heterostructure comprising of alternating layers of 1H-TaS2 and 1T-TaS2. The former is a well-known superconductor, while the latter is a correlated insulator with a possible non- trivial magnetic ground state. In this study, we use angle resolved photoemission spectroscopy to investigate the normal state electronic structure of this unconventional superconductor. Our findings reveal that the band structure of 4Hb-TaS2 fundamentally differs from that of its constituent materials. Specifically, we observe a significant charge transfer from the 1T layers to the 1H layers that drives the 1T layers away from half-filling. In addition, we find a substantial reduction in inter-layer coupling in 4Hb-TaS2 compared to the coupling in 2H-TaS2 that results in a pronounced spin-valley locking within 4Hb-TaS2.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"47 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2024-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140544890","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

Spin-orbit coupling induced Van Hove singularity in proximity to a Lifshitz transition in Sr4Ru3O10 Sr4Ru3O10 中靠近 Lifshitz 转变的自旋轨道耦合诱导的范霍夫奇异点

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2024-04-08 DOI: 10.1038/s41535-024-00645-3

Carolina A. Marques, Philip A. E. Murgatroyd, Rosalba Fittipaldi, Weronika Osmolska, Brendan Edwards, Izidor Benedičič, Gesa-R. Siemann, Luke C. Rhodes, Sebastian Buchberger, Masahiro Naritsuka, Edgar Abarca-Morales, Daniel Halliday, Craig Polley, Mats Leandersson, Masafumi Horio, Johan Chang, Raja Arumugam, Mariateresa Lettieri, Veronica Granata, Antonio Vecchione, Phil D. C. King, Peter Wahl

{"title":"Spin-orbit coupling induced Van Hove singularity in proximity to a Lifshitz transition in Sr4Ru3O10","authors":"Carolina A. Marques, Philip A. E. Murgatroyd, Rosalba Fittipaldi, Weronika Osmolska, Brendan Edwards, Izidor Benedičič, Gesa-R. Siemann, Luke C. Rhodes, Sebastian Buchberger, Masahiro Naritsuka, Edgar Abarca-Morales, Daniel Halliday, Craig Polley, Mats Leandersson, Masafumi Horio, Johan Chang, Raja Arumugam, Mariateresa Lettieri, Veronica Granata, Antonio Vecchione, Phil D. C. King, Peter Wahl","doi":"10.1038/s41535-024-00645-3","DOIUrl":"https://doi.org/10.1038/s41535-024-00645-3","url":null,"abstract":"Van Hove singularities (VHss) in the vicinity of the Fermi energy often play a dramatic role in the physics of strongly correlated electron materials. The divergence of the density of states generated by VHss can trigger the emergence of phases such as superconductivity, ferromagnetism, metamagnetism, and density wave orders. A detailed understanding of the electronic structure of these VHss is therefore essential for an accurate description of such instabilities. Here, we study the low-energy electronic structure of the trilayer strontium ruthenate Sr4Ru3O10, identifying a rich hierarchy of VHss using angle-resolved photoemission spectroscopy and millikelvin scanning tunneling microscopy. Comparison of k-resolved electron spectroscopy and quasiparticle interference allows us to determine the structure of the VHss and demonstrate the crucial role of spin-orbit coupling in shaping them. We use this to develop a minimal model from which we identify a mechanism for driving a field-induced Lifshitz transition in ferromagnetic metals.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"39 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2024-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140538578","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

Spectral stability of V2 centres in sub-micron 4H-SiC membranes 亚微米 4H-SiC 膜中 V2 中心的光谱稳定性

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2024-04-04 DOI: 10.1038/s41535-024-00644-4

Jonah Heiler, Jonathan Körber, Erik Hesselmeier, Pierre Kuna, Rainer Stöhr, Philipp Fuchs, Misagh Ghezellou, Jawad Ul-Hassan, Wolfgang Knolle, Christoph Becher, Florian Kaiser, Jörg Wrachtrup

{"title":"Spectral stability of V2 centres in sub-micron 4H-SiC membranes","authors":"Jonah Heiler, Jonathan Körber, Erik Hesselmeier, Pierre Kuna, Rainer Stöhr, Philipp Fuchs, Misagh Ghezellou, Jawad Ul-Hassan, Wolfgang Knolle, Christoph Becher, Florian Kaiser, Jörg Wrachtrup","doi":"10.1038/s41535-024-00644-4","DOIUrl":"https://doi.org/10.1038/s41535-024-00644-4","url":null,"abstract":"Colour centres in silicon carbide emerge as a promising semiconductor quantum technology platform with excellent spin-optical coherences. However, recent efforts towards maximising the photonic efficiency via integration into nanophotonic structures proved to be challenging due to reduced spectral stabilities. Here, we provide a large-scale systematic investigation on silicon vacancy centres in thin silicon carbide membranes with thicknesses down to 0.25 μm. Our membrane fabrication process involves a combination of chemical mechanical polishing, reactive ion etching, and subsequent annealing. This leads to highly reproducible membranes with roughness values of 3–4 Å, as well as negligible surface fluorescence. We find that silicon vacancy centres show close-to lifetime limited optical linewidths with almost no signs of spectral wandering down to membrane thicknesses of ~0.7 μm. For silicon vacancy centres in thinner membranes down to 0.25 μm, we observe spectral wandering, however, optical linewidths remain below 200 MHz, which is compatible with spin-selective excitation schemes. Our work clearly shows that silicon vacancy centres can be integrated into sub-micron silicon carbide membranes, which opens the avenue towards obtaining the necessary improvements in photon extraction efficiency based on nanophotonic structuring.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"1 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2024-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140346259","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

Electric polarization near vortices in the extended Kitaev model 扩展基塔耶夫模型中涡旋附近的电偏振

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2024-03-29 DOI: 10.1038/s41535-024-00643-5

Lucas R. D. Freitas, Tim Bauer, Reinhold Egger, Rodrigo G. Pereira

引用次数: 0

Coherent phonon and unconventional carriers in the magnetic kagome metal Fe3Sn2 磁性神目金属 Fe3Sn2 中的相干声子和非常规载流子

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2024-03-21 DOI: 10.1038/s41535-024-00642-6

Marcos V. Gonçalves-Faria, Alexej Pashkin, Qi Wang, Hechang C. Lei, Stephan Winnerl, Alexander A. Tsirlin, Manfred Helm, Ece Uykur

{"title":"Coherent phonon and unconventional carriers in the magnetic kagome metal Fe3Sn2","authors":"Marcos V. Gonçalves-Faria, Alexej Pashkin, Qi Wang, Hechang C. Lei, Stephan Winnerl, Alexander A. Tsirlin, Manfred Helm, Ece Uykur","doi":"10.1038/s41535-024-00642-6","DOIUrl":"https://doi.org/10.1038/s41535-024-00642-6","url":null,"abstract":"Temperature- and fluence-dependent carrier dynamics of the magnetic kagome metal Fe3Sn2 were studied using the ultrafast optical pump-probe technique. Two carrier relaxation processes and a laser-induced coherent optical phonon were observed. We ascribe the shorter relaxation (~1 ps) to hot electrons transferring their energy to the crystal lattice via electron–phonon scattering. The second relaxation (~30 ps), on the other hand, cannot be explained as a conventional process, and we attributed it to the unconventional (localized) carriers in the material. The observed coherent oscillation is assigned to be a totally symmetric A1g optical phonon dominated by Sn displacements out of the kagome planes and possesses a prominently large amplitude, on the order of 10−3, comparable to the maximum of the reflectivity change (ΔR/R). This amplitude is similar to what has been observed for coherent phonons in charge-density-wave (CDW) systems, although no signs of such instability were hitherto reported in Fe3Sn2. Our results suggest an unexpected connection between Fe3Sn2 and kagome metals with CDW instabilities and a strong interplay between phonon and electron dynamics in this compound.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"7 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2024-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140182768","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