npj Quantum Materials最新文献_第4页

Observation of ubiquitous charge correlations and hidden quantum critical point in hole-doped kagome superconductors 空穴掺杂kagome超导体中无处不在的电荷关联和隐藏量子临界点的观察

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2026-07-04 DOI: 10.1038/s41535-026-00916-1

Ilija K. Nikolov, Giuseppe Allodi, Adrien Rosuel, Ginevra Corsale, Anshu Kataria, Pietro Bonfà, Roberto De Renzi, Andrea Capa Salinas, Stephen D. Wilson, Marc-Henri Julien, Samuele Sanna, Vesna F. Mitrović

{"title":"Observation of ubiquitous charge correlations and hidden quantum critical point in hole-doped kagome superconductors","authors":"Ilija K. Nikolov, Giuseppe Allodi, Adrien Rosuel, Ginevra Corsale, Anshu Kataria, Pietro Bonfà, Roberto De Renzi, Andrea Capa Salinas, Stephen D. Wilson, Marc-Henri Julien, Samuele Sanna, Vesna F. Mitrović","doi":"10.1038/s41535-026-00916-1","DOIUrl":"https://doi.org/10.1038/s41535-026-00916-1","url":null,"abstract":"The interplay between superconductivity and the charge-density wave (CDW) order, and its evolution with carrier density, is central to the physics of many quantum materials, notably high-Tc cuprates and kagome metals. Hole-doped kagome compounds exhibit puzzling electronic phases and, as chemical substitution inevitably introduces quenched disorder, their properties remain poorly understood. Here, by leveraging the sensitivity of nuclear quadrupole resonance to local and static orderings, we uncover new features, primarily the incipient and fragmented CDW phases, in the charge landscape of CsV3Sb5−xSnx. Static CDW puddles are observed well above the transition temperature, a hallmark of pinning by defects. Their doping and temperature evolution indicate that, in the absence of disorder, the inverse Star-of-David π-shifted (ISD-π) CDW order would vanish near x = 0.12, between the two superconducting domes. This critical doping represents a hidden quantum critical point. Nevertheless, the ISD-π pattern persists well beyond previous reports, although its volume fraction is progressively reduced up to the critical doping at which it seems to saturate. We establish that carrier doping promotes fragmentation of the ISD-π order, whereas randomness preserves the ISD-π patches.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"21 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2026-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148385796","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

Coexistence of liquid-like disordered state and weak ferromagnetism in a s = 1 kagome lattice s = 1 kagome晶格中类液体无序态与弱铁磁性的共存

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2026-06-29 DOI: 10.1038/s41535-026-00917-0

J. Khatua, Taeyun Kim, Chanhyeon Lee, U. Jena, P. Khuntia, Gyungbin Ban, Y.-S. Choi, Jonas A. Krieger, Thomas J. Hicken, Hubertus Luetkens, Marc Uhlarz, Suyoung Kim, Eundeok Mun, Hiroyuki Nojiri, Kwang-Yong Choi

{"title":"Coexistence of liquid-like disordered state and weak ferromagnetism in a s = 1 kagome lattice","authors":"J. Khatua, Taeyun Kim, Chanhyeon Lee, U. Jena, P. Khuntia, Gyungbin Ban, Y.-S. Choi, Jonas A. Krieger, Thomas J. Hicken, Hubertus Luetkens, Marc Uhlarz, Suyoung Kim, Eundeok Mun, Hiroyuki Nojiri, Kwang-Yong Choi","doi":"10.1038/s41535-026-00917-0","DOIUrl":"https://doi.org/10.1038/s41535-026-00917-0","url":null,"abstract":"Spin-1 kagome lattice antiferromagnets provide a versatile platform for exploring exotic quantum states, such as classical spin liquids and spin nematics, owing to the confluence of geometric frustration, bilinear and biquadratic interactions, and single-ion anisotropy. Here, we investigate the ground state and spin dynamics of a nearly perfect s = 1 kagome lattice, (CH3NH3)2NaV3F12{({text{CH}}_{3}{text{NH}}_{3})}_{2}{text{NaV}}_{3}{text{F}}_{12}, which hosts dominant antiferromagnetic interactions (J ≈ 10 K) alongside easy-axis anisotropy. Using a combination of thermodynamic and resonance techniques, we identify the occurrence of weak ferromagnetic ordering at TC ≈ 4 K. Singularly, even in this time-reversal symmetry-breaking state, muon spin relaxation, 23Na spin-lattice relaxation rate, and magnetic specific heat measurements collectively reveal persistent spin dynamics and intriguing gapless excitations. The observation of liquid-like correlations in the ground state establishes (CH3NH3)2NaV3F12{({text{CH}}_{3}{text{NH}}_{3})}_{2}{text{NaV}}_{3}{text{F}}_{12} as a rare instance of the coexistence of dynamically fluctuating spins and weak ferromagnetism, raising the possibility of realizing an intriguing ground state in s = 1 kagome antiferromagnets with Ising anisotropy.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"23 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2026-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148385798","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

Photostriction-driven phase transition in layered chiral NbOX2 crystals: electrical-field-controlled enantiomer selectivity 层状手性NbOX2晶体的光伸缩驱动相变：电场控制对映体选择性

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2026-06-26 DOI: 10.1038/s41535-026-00911-6

Jorge Cardenas-Gamboa, Martin Gutierrez-Amigo, Aritz Leonardo, Gregory A. Fiete, Juan L. Mañes, Jeroen van den Brink, Claudia Felser, Maia G. Vergniory

{"title":"Photostriction-driven phase transition in layered chiral NbOX2 crystals: electrical-field-controlled enantiomer selectivity","authors":"Jorge Cardenas-Gamboa, Martin Gutierrez-Amigo, Aritz Leonardo, Gregory A. Fiete, Juan L. Mañes, Jeroen van den Brink, Claudia Felser, Maia G. Vergniory","doi":"10.1038/s41535-026-00911-6","DOIUrl":"https://doi.org/10.1038/s41535-026-00911-6","url":null,"abstract":"The physical properties of chiral crystals are inherently tied to their structural handedness, making external control of chirality a key challenge for functional materials design. However, the ability to select between structural enantiomers remains challenging, both theoretically and experimentally. In this work, we demonstrate a two-step pathway for enantiomer selectivity in layered chiral NbOX2 (X = Cl, Br, I) crystals based on photostriction-driven phase transitions. Ab-initio simulations reveal that optical excitation is capable of inducing a structural phase transition in NbOX2 from the monoclinic (C2) ground state to the higher-symmetry (C2/m) structure. In the resulting transient high-symmetry state, an applied electric field breaks the residual inversion-symmetry degeneracy, selectively stabilizing one enantiomeric final state configuration over the other. Our results establish a combined optical-electrical control scheme for chiral materials, enabling reversible and non-contact enantiomer selection with potential applications in ultrafast switching, optoelectronics, and chiral information storage.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"49 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2026-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148336443","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

Observation of a saddle-loop van Hove singularity 鞍环范霍夫奇点的观测

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2026-06-25 DOI: 10.1038/s41535-026-00905-4

Y. Morita, K. Nakayama, N. Ito, T. Kato, T. Nakamura, H. Zhang, X. Tang, T. Lin, K. Yanagizawa, S. Souma, S. Masaki, T. Ikushima, Y. Moriyasu, K. Hagiwara, F. Matsui, K. Tanaka, K. Ozawa, D. Shiga, H. Kumigashira, M. Maeda, Y. Niimi, T. Kida, M. Hagiwara, T. K. Kim, C. Cacho, T. Takahashi, Y. Okada, S. Zhou, T. Koretsune, K. Kudo, T. Sato

{"title":"Observation of a saddle-loop van Hove singularity","authors":"Y. Morita, K. Nakayama, N. Ito, T. Kato, T. Nakamura, H. Zhang, X. Tang, T. Lin, K. Yanagizawa, S. Souma, S. Masaki, T. Ikushima, Y. Moriyasu, K. Hagiwara, F. Matsui, K. Tanaka, K. Ozawa, D. Shiga, H. Kumigashira, M. Maeda, Y. Niimi, T. Kida, M. Hagiwara, T. K. Kim, C. Cacho, T. Takahashi, Y. Okada, S. Zhou, T. Koretsune, K. Kudo, T. Sato","doi":"10.1038/s41535-026-00905-4","DOIUrl":"https://doi.org/10.1038/s41535-026-00905-4","url":null,"abstract":"Exploiting electronic singularities to drive emergent quantum phenomena is a key basis in condensed matter physics, yet this powerful strategy has been largely limited to two dimensions, leaving the potential of three-dimensional materials often inaccessible. A “saddle-loop” singularity—a one-dimensional ring of saddle points—has been proposed as a way to extend the concept of van Hove singularities to three-dimensional electron systems, but has remained experimentally elusive. Here, we provide the direct experimental evidence for the saddle‑loop singularity in Pt(Bi1−xSex)2, using angle‑resolved photoemission spectroscopy. We also show that the saddle loop is positioned closer to the Fermi level at low x values where the superconducting critical temperature is higher. Furthermore, our advanced theoretical calculations reveal that the saddle loop originates from inter-orbital hybridization, establishing a generalizable design concept. Our findings demonstrate a viable mechanism for realizing singular electronic states in three-dimensional electron systems, providing a platform to investigate correlation-driven phenomena in three dimensions.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"5 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2026-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148336445","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

Universal scaling functions of the magnetic Grüneisen ratio near quantum critical points 量子临界点附近磁粒<s:1>尼森比的通用标度函数

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2026-06-25 DOI: 10.1038/s41535-026-00904-5

Xuan Zhou, Enze Lv, Wei Li, Yang Qi

{"title":"Universal scaling functions of the magnetic Grüneisen ratio near quantum critical points","authors":"Xuan Zhou, Enze Lv, Wei Li, Yang Qi","doi":"10.1038/s41535-026-00904-5","DOIUrl":"https://doi.org/10.1038/s41535-026-00904-5","url":null,"abstract":"The magnetic Grüneisen ratio, defined as Γg ≡ (1/T)(∂T/∂g)S, characterizes the magnetocaloric effect (MCE) driven by an external field g and serves as a highly sensitive probe for field-induced quantum critical points (QCPs). Near a QCP, Γg displays diverging behaviors described by a universal scaling function depending on the universality class. Here, we systematically investigate the universal scaling functions of Grüneisen ratio Γg in typical one-dimensional (1D) and two-dimensional (2D) quantum spin systems, including the transverse-field Ising model, XY model, q-state quantum Potts model (q = 3, 4), and the J1-J2 columnar dimer model. Our approach employs the linearized tensor renormalization group (LTRG) method for infinite-size 1D systems and the stochastic series expansion quantum Monte Carlo (SSE QMC) simulations for 2D systems, enabling precise calculations of the Γg near QCPs. We extract universal scaling functions via data collapse analysis. This universal magnetocaloric framework offers a quantitative tool for analyzing measurements in quantum materials and for guiding the search for quantum critical cooling applications.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"27 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2026-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148336446","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

Magnetically ordered yet topologically robust phases emerging in concurrent Kitaev spin liquids 并发基塔耶夫自旋液体中出现的磁有序但拓扑健壮的相

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2026-06-25 DOI: 10.1038/s41535-026-00912-5

Muhammad Akram, Aayush Vijayvargia, Hae-Young Kee, Onur Erten

引用次数: 0

Intrinsic antiferromagnetic half-metal and topological phases from the ferrovalley states of the sliding bilayer altermagnets 滑动双层交替磁体铁谷态的本征反铁磁性半金属和拓扑相

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2026-06-25 DOI: 10.1038/s41535-026-00915-2

Shihao Zhang

{"title":"Intrinsic antiferromagnetic half-metal and topological phases from the ferrovalley states of the sliding bilayer altermagnets","authors":"Shihao Zhang","doi":"10.1038/s41535-026-00915-2","DOIUrl":"https://doi.org/10.1038/s41535-026-00915-2","url":null,"abstract":"Altermagnetism is characterized by non-relativistic spin splitting and zero total magnetic moments. Herein, we identify intrinsic antiferromagnetic half-metallic phases and topological phases emerging from the ferrovalley states of sliding bilayer altermagnets. Taking the V2OSSe system for example, first-principles calculations indicate that the spin-dependent interlayer hopping in the ferrovalley state ensures a direct gap in one valley (one spin channel) and band inversion in the other valley (opposite spin channel), which is manifested as an intrinsic antiferromagnetic half-metal. The microscopic model and effective Hamiltonian employed in this research confirm the universal spin-dependent interlayer hopping in the sliding altermagnet bilayer. Further calculations imply the existence of Chern insulators and gapless surface states in the sliding altermagnet bilayer. Adjusting the sliding direction can achieve the transition between different half-metals with conducting electrons of different spins, accompanied by the switching of gapless surface states of opposite spins. This work proposes a roadmap to achieve the intrinsic antiferromagnetic half-metals, laying the foundation for potential applications of intrinsic antiferromagnetic half-metals and topological phases in spintronics.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"34 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2026-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148336447","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

Quantum phase transition between weak itinerant ferromagnetism and superconductivity induced by interstitial localized electrons in Li7Pb Li7Pb中间隙局域电子诱导的弱流动铁磁性与超导性之间的量子相变

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2026-06-24 DOI: 10.1038/s41535-026-00896-2

Qing Lu, Zhongwei Zhang, Chi Ding, Yijie Zhu, Xiaomeng Wang, Junjie Wang, Yu Han, Jian Sun

{"title":"Quantum phase transition between weak itinerant ferromagnetism and superconductivity induced by interstitial localized electrons in Li7Pb","authors":"Qing Lu, Zhongwei Zhang, Chi Ding, Yijie Zhu, Xiaomeng Wang, Junjie Wang, Yu Han, Jian Sun","doi":"10.1038/s41535-026-00896-2","DOIUrl":"https://doi.org/10.1038/s41535-026-00896-2","url":null,"abstract":"Quantum phase transitions are crucial for understanding emergent phenomena in quantum many-body systems, especially at zero temperature, where quantum fluctuations dominate. Here, we utilized the crystal structure searching method in conjunction with first-principles calculations to investigate the lithium-lead system, leading to the discovery of three exotic phases. Notably, the P-62m Li7Pb emerges as an electride with distinct A-type and B-type interstitial anion electrons (IAEs). The bilayer Kagome lattice of Li7Pb accommodates weak itinerant ferromagnetism within the stable pressure range from 20 to 45 GPa, primarily attributed to the presence of B-type IAEs. On the contrary, A-type IAEs are sensitive to charge doping, impacting the modulation of ferromagnetism. Furthermore, electron doping led to the transition of Li7Pb into a superconductor as the magnetic moment diminished, and the transition temperature could be raised from 1.6 to 3.4 K as doping intensified. This transition was facilitated by the interaction between A-type IAEs and phonons from the surrounding lithium lattice, showcasing a unique quantum phase transition between itinerant ferromagnetism and superconductivity in electrides. Our study not only revealed novel structures in lithium-lead systems but also established a platform for exploring quantum phase transitions in electrides.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"76 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2026-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148336456","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

Field-free Josephson diode and tunable ϕ0-junction in chiral kagome antiferromagnets 手性kagome反铁磁体中的无场约瑟夫森二极管和可调谐的ϕ0结

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2026-06-17 DOI: 10.1038/s41535-026-00907-2

Jin-Xing Hou, Chuang Li, Lun-Hui Hu, Song-Bo Zhang

{"title":"Field-free Josephson diode and tunable ϕ0-junction in chiral kagome antiferromagnets","authors":"Jin-Xing Hou, Chuang Li, Lun-Hui Hu, Song-Bo Zhang","doi":"10.1038/s41535-026-00907-2","DOIUrl":"https://doi.org/10.1038/s41535-026-00907-2","url":null,"abstract":"The recent realization of superconducting proximity effects in chiral antiferromagnets (cAFMs) opens a new route to nonreciprocal superconducting transport of fundamental interest and practical importance. Using microscopic modeling and symmetry analysis, we show that Josephson junctions formed by conventional s-wave superconductors (SCs) and cAFMs on the kagome lattice exhibit both Josephson diode effects and anomalous Josephson effects (a ϕ0-junction state with a finite supercurrent at zero phase bias) when spacial inversion ({mathcal{I}}), time-reversal ({mathcal{T}}), and the combined mirror-time-reversal ({{mathcal{TM}}}_{z}) symmetries are simultaneously broken. We propose two setups to realize these phenomena and achieve high diode efficiency. (i) An SC/cAFM/SC junction with spin-orbit coupling, which enables a field-free diode effect together with a tunable anomalous Josephson supercurrent. (ii) An SC/cAFM/({{rm{cAFM}}}^{{prime} })/SC junction, where two cAFM layers with different in-plane order orientations, under an out-of-plane Zeeman field, produce a pronounced diode effect and anomalous Josephson response. These results establish a direct link between ({{mathcal{TM}}}_{z}) symmetry breaking and nonreciprocal superconductivity, suggesting cAFMs as versatile platforms for symmetry-engineered Josephson diodes and tunable ϕ0-junctions.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":"158 1","pages":""},"PeriodicalIF":5.7,"publicationDate":"2026-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148290266","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-lattice coupling induced chiral phonons and their signature in Raman Circular Dichroism 自旋-晶格耦合诱导手性声子及其在拉曼圆二色中的特征

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2026-06-17 DOI: 10.1038/s41535-026-00893-5

Eduard Koller, Swetlana Swarup, Johannes Knolle, Natalia B. Perkins

引用次数: 0