npj Quantum Materials最新文献_第2页

Charge order near the antiferromagnetic quantum critical point in the trilayer high Tc cuprate HgBa2Ca2Cu3O8+δ 三层高碲铜氧化物 HgBa2Ca2Cu3O8+δ 中反铁磁量子临界点附近的电荷秩序

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2024-10-04 DOI: 10.1038/s41535-024-00688-6

V. Oliviero, I. Gilmutdinov, D. Vignolles, S. Benhabib, N. Bruyant, A. Forget, D. Colson, W. A. Atkinson, C. Proust

引用次数: 0

Interorbital antisymmetric hopping generated flat bands on kagome and pyrochlore Lattices 轨道间不对称跳变在卡戈梅晶格和火成晶格上产生平带

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2024-09-30 DOI: 10.1038/s41535-024-00685-9

Keyu Zeng, Ziqiang Wang

引用次数: 0

Collapse of metallicity and high-Tc superconductivity in the high-pressure phase of FeSe0.89S0.11 FeSe0.89S0.11 高压相中的金属性崩溃和高锝超导性

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2024-09-30 DOI: 10.1038/s41535-024-00677-9

Pascal Reiss, Alix McCollam, Zachary Zajicek, Amir A. Haghighirad, Amalia I. Coldea

{"title":"Collapse of metallicity and high-Tc superconductivity in the high-pressure phase of FeSe0.89S0.11","authors":"Pascal Reiss, Alix McCollam, Zachary Zajicek, Amir A. Haghighirad, Amalia I. Coldea","doi":"10.1038/s41535-024-00677-9","DOIUrl":"https://doi.org/10.1038/s41535-024-00677-9","url":null,"abstract":"We investigate the high-pressure phase of the iron-based superconductor FeSe0.89S0.11 using transport and tunnel diode oscillator studies using diamond anvil cells. We construct detailed pressure-temperature phase diagrams that indicate that the superconducting critical temperature is strongly enhanced by more than a factor of four towards 40 K above 4 GPa. The resistivity data reveal signatures of a fan-like structure of non-Fermi liquid behaviour which could indicate the existence of a putative quantum critical point buried underneath the superconducting dome around 4.3 GPa. With further increasing the pressure, the zero-field electrical resistivity develops a non-metallic temperature dependence and the superconducting transition broadens significantly. Eventually, the system fails to reach a fully zero-resistance state, and the finite resistance at low temperatures becomes strongly current-dependent. Our results suggest that the high-pressure, high-Tc phase of iron chalcogenides is very fragile and sensitive to uniaxial effects of the pressure medium, cell design and sample thickness. This high-pressure region could be understood assuming a real-space phase separation caused by nearly concomitant electronic and structural instabilities.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":null,"pages":null},"PeriodicalIF":5.7,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142330328","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

Exploring possible magnetic monopoles-induced magneto-electricity in spin ices 探索自旋冰中可能的磁单极子诱导磁电现象

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2024-09-20 DOI: 10.1038/s41535-024-00676-w

Y. Alexanian, J. Saugnier, C. Decorse, J. Robert, R. Ballou, E. Lhotel, J. Debray, F. Gay, V. Simonet, S. de Brion

{"title":"Exploring possible magnetic monopoles-induced magneto-electricity in spin ices","authors":"Y. Alexanian, J. Saugnier, C. Decorse, J. Robert, R. Ballou, E. Lhotel, J. Debray, F. Gay, V. Simonet, S. de Brion","doi":"10.1038/s41535-024-00676-w","DOIUrl":"https://doi.org/10.1038/s41535-024-00676-w","url":null,"abstract":"The possibilities of combining several degrees of freedom inside a unique material have recently been highlighted in their dynamics and proposed as information carriers in quantum devices where their cross-manipulation by external parameters such as electric and magnetic fields could enhance their functionalities. An emblematic example is that of electromagnons, spin-waves dressed with electric dipoles, that are fingerprints of multiferroics. Point-like objects have also been identified, which may take the form of excited quasiparticles. This is the case for magnetic monopoles, the exotic excitations of spin ices, that have been recently proposed to carry an electric dipole, although experimental evidences remain elusive. Presently, we investigate the electrical signature of a classical spin ice and a related compound that supports quantum fluctuations. Our in-depth study clearly attributes magneto-electricity to the correlated spin ice phase distinguishing it from extrinsic and single-ion effects. Our calculations show that the proposed model conferring magneto-electricity to monopoles is not sufficient, calling for higher-order contributions.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":null,"pages":null},"PeriodicalIF":5.7,"publicationDate":"2024-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142276080","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 flat bands and Dirac cones in a pyrochlore lattice superconductor 观察火成晶格超导体中的扁平带和狄拉克锥

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2024-09-19 DOI: 10.1038/s41535-024-00683-x

Jianwei Huang, Chandan Setty, Liangzi Deng, Jing-Yang You, Hongxiong Liu, Sen Shao, Ji Seop Oh, Yucheng Guo, Yichen Zhang, Ziqin Yue, Jia-Xin Yin, Makoto Hashimoto, Donghui Lu, Sergey Gorovikov, Pengcheng Dai, Jonathan D. Denlinger, J. W. Allen, M. Zahid Hasan, Yuan-Ping Feng, Robert J. Birgeneau, Youguo Shi, Ching-Wu Chu, Guoqing Chang, Qimiao Si, Ming Yi

{"title":"Observation of flat bands and Dirac cones in a pyrochlore lattice superconductor","authors":"Jianwei Huang, Chandan Setty, Liangzi Deng, Jing-Yang You, Hongxiong Liu, Sen Shao, Ji Seop Oh, Yucheng Guo, Yichen Zhang, Ziqin Yue, Jia-Xin Yin, Makoto Hashimoto, Donghui Lu, Sergey Gorovikov, Pengcheng Dai, Jonathan D. Denlinger, J. W. Allen, M. Zahid Hasan, Yuan-Ping Feng, Robert J. Birgeneau, Youguo Shi, Ching-Wu Chu, Guoqing Chang, Qimiao Si, Ming Yi","doi":"10.1038/s41535-024-00683-x","DOIUrl":"https://doi.org/10.1038/s41535-024-00683-x","url":null,"abstract":"Emergent phases often appear when the electronic kinetic energy is comparable to the Coulomb interactions. One approach to seek material systems as hosts of such emergent phases is to realize localization of electronic wavefunctions due to the geometric frustration inherent in the crystal structure, resulting in flat electronic bands. Recently, such efforts have found a wide range of exotic phases in the two-dimensional kagome lattice, including magnetic order, time-reversal symmetry breaking charge order, nematicity, and superconductivity. However, the interlayer coupling of the kagome layers disrupts the destructive interference needed to completely quench the kinetic energy. Here we demonstrate that an interwoven kagome network—a pyrochlore lattice—can host a three dimensional (3D) localization of electron wavefunctions. Meanwhile, the nonsymmorphic symmetry of the pyrochlore lattice guarantees all band crossings at the Brillouin zone X point to be 3D gapless Dirac points, which was predicted theoretically but never yet observed experimentally. Through a combination of angle-resolved photoemission spectroscopy, fundamental lattice model and density functional theory calculations, we investigate the novel electronic structure of a Laves phase superconductor with a pyrochlore sublattice, CeRu2. We observe evidence of flat bands originating from the Ce 4f orbitals as well as flat bands from the 3D destructive interference of the Ru 4d orbitals. We further observe the nonsymmorphic symmetry-protected 3D gapless Dirac cone at the X point. Our work establishes the pyrochlore structure as a promising lattice platform to realize and tune novel emergent phases intertwining topology and many-body interactions.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":null,"pages":null},"PeriodicalIF":5.7,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142245186","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

Vortex-induced anomalies in the superconducting quantum interference patterns of topological insulator Josephson junctions 拓扑绝缘体约瑟夫森结超导量子干涉模式中的涡旋诱导反常现象

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2024-09-17 DOI: 10.1038/s41535-024-00684-w

Arman Rashidi, William Huynh, Binghao Guo, Sina Ahadi, Susanne Stemmer

{"title":"Vortex-induced anomalies in the superconducting quantum interference patterns of topological insulator Josephson junctions","authors":"Arman Rashidi, William Huynh, Binghao Guo, Sina Ahadi, Susanne Stemmer","doi":"10.1038/s41535-024-00684-w","DOIUrl":"https://doi.org/10.1038/s41535-024-00684-w","url":null,"abstract":"The superconducting quantum interference (SQI) patterns of Josephson junctions fabricated from hybrid structures that interface an s-wave superconductor with a topological insulator can be used to detect signatures of novel quasiparticle states. Here, we compare calculated and experimental SQI patterns obtained from hybrid junctions fabricated on cadmium arsenide, a two-dimensional topological insulator. The calculations account for the effects of Abrikosov (anti-) vortices in the superconducting contacts. They describe the experimentally observed deviations of the SQI from an ideal Fraunhofer pattern, including anomalous phase shifts, node lifting, even/odd modulations of the lobes, irregular lobe spacing, and an asymmetry in the positive/negative magnetic field. We also show that under a current bias, these vortices enter the electrodes even if there is no intentionally applied external magnetic field. The results show that Abrikosov vortices in the electrodes of the junctions can explain many of the observed anomalies in the SQI patterns of topological insulator Josephson junctions.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":null,"pages":null},"PeriodicalIF":5.7,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142235244","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

Unconventional spin textures emerging from a universal symmetry theory of spin-momentum locking 自旋动量锁定的普遍对称理论所产生的非常规自旋纹理

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2024-09-14 DOI: 10.1038/s41535-024-00682-y

Yuntian Liu, Jiayu Li, Pengfei Liu, Qihang Liu

引用次数: 0

Incommensurate magnetic order in an axion insulator candidate EuIn2As2 investigated by NMR measurement 通过核磁共振测量研究轴心绝缘体候选体 EuIn2As2 中的不相称磁序

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2024-09-12 DOI: 10.1038/s41535-024-00680-0

Hikaru Takeda, Jian Yan, Zhongzhu Jiang, Xuan Luo, Yuping Sun, Minoru Yamashita

{"title":"Incommensurate magnetic order in an axion insulator candidate EuIn2As2 investigated by NMR measurement","authors":"Hikaru Takeda, Jian Yan, Zhongzhu Jiang, Xuan Luo, Yuping Sun, Minoru Yamashita","doi":"10.1038/s41535-024-00680-0","DOIUrl":"https://doi.org/10.1038/s41535-024-00680-0","url":null,"abstract":"Magnetic topological insulators exhibit unique electronic states due to the interplay between the electronic topology and the spin structure. The antiferromagnetic metal EuIn2As2 is a prominent candidate material in which exotic topological phases, including an axion insulating state, are theoretically predicted depending on the magnetic structure of the Eu2+ moments. Here, we report experimental results of the nuclear magnetic resonance (NMR) measurements of all the nuclei in EuIn2As2 to investigate the coupling between the magnetic moments in the Eu ions and the conduction electrons in In2As2 layers and the magnetic structure. The 75As and 115In NMR spectra observed at zero external magnetic fields reveal the appearance of internal fields of 4.9 and 3.6 T, respectively, at the lowest temperature, suggesting a strong coupling between the conduction electrons in the In2As2 layer and the ordered magnetic moments in the Eu ions. The 75As NMR spectra under in-plane external magnetic fields show broad distributions of the internal fields produced by an incommensurate fan-like spin structure which turns into a forced ferromagnetic state above 0.7 T. We propose a spin reorientation process that an incommensurate helical state at zero external magnetic field quickly changes into a fan state by applying a slight magnetic field.","PeriodicalId":19283,"journal":{"name":"npj Quantum Materials","volume":null,"pages":null},"PeriodicalIF":5.7,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142170842","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

d-wave charge-4e superconductivity from fluctuating pair density waves 来自波动对密度波的 d 波电荷-4e 超导性

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2024-09-05 DOI: 10.1038/s41535-024-00674-y

Yi-Ming Wu, Yuxuan Wang

引用次数: 0

Kinetic ferromagnetism and topological magnons of the hole-doped Kitaev spin liquid 掺孔基塔耶夫自旋液体的动铁磁性和拓扑磁子

IF 5.7 1区物理与天体物理

npj Quantum Materials Pub Date : 2024-09-04 DOI: 10.1038/s41535-024-00678-8

Hui-Ke Jin, Wilhelm Kadow, Michael Knap, Johannes Knolle

引用次数: 0