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He X, Gan H, Du Z, Ye B, Zhou L, Tian Y, Deng S, Guo G, Lu H, Liu F, He H. Magnetoresistance Anomaly in Topological Kondo Insulator SmB 6 Nanowires with Strong Surface Magnetism. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2018; 5:1700753. [PMID: 30027028 PMCID: PMC6051400 DOI: 10.1002/advs.201700753] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/18/2017] [Revised: 04/18/2018] [Indexed: 06/08/2023]
Abstract
Topological Kondo insulators (TKIs) are a new class of topological materials in which topological surface states dominate the transport properties at low temperatures. They are also an ideal platform for studying the interplay between strong electron correlations and topological order. Here, hysteretic magnetoresistance (MR) is observed in TKI SmB6 thin nanowires at temperatures up to 8 K, revealing the strong magnetism at the surface of SmB6. It is also found that such MR anomaly exhibits an intriguing finite size effect and only appears in nanowires with diameter smaller than 58 nm. These nontrivial phenomena are discussed in terms of the latest Kondo breakdown model, which incorporates the RKKY magnetic interaction mediated by surface states with the strong electron correlation in SmB6. It would provide new insight into the nature of TKI surface states. Additionally, a non-monotonically temperature dependent positive magnetoresistance is observed at intermediate temperatures, suggesting the possible impurity-band conduction in SmB6, other than the surface state transport at low temperatures and the bulk-band transport at high temperatures.
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Affiliation(s)
- Xingshuai He
- Institute for Quantum Science and Engineering and Department of PhysicsSouth University of Science and Technology of ChinaShenzhen518055China
| | - Haibo Gan
- State Key Laboratory of Optoelectronic Materials and TechnologiesGuangdong Province Key Laboratory of Display Material and Technology and School of Electronics and Information TechnologySun Yat‐sen UniversityGuangzhou510275China
| | - Zongzheng Du
- Institute for Quantum Science and Engineering and Department of PhysicsSouth University of Science and Technology of ChinaShenzhen518055China
- School of PhysicsSoutheast UniversityNanjing211189China
| | - Bicong Ye
- Institute for Quantum Science and Engineering and Department of PhysicsSouth University of Science and Technology of ChinaShenzhen518055China
| | - Liang Zhou
- Institute for Quantum Science and Engineering and Department of PhysicsSouth University of Science and Technology of ChinaShenzhen518055China
| | - Yuan Tian
- State Key Laboratory of Optoelectronic Materials and TechnologiesGuangdong Province Key Laboratory of Display Material and Technology and School of Electronics and Information TechnologySun Yat‐sen UniversityGuangzhou510275China
| | - Shaozhi Deng
- State Key Laboratory of Optoelectronic Materials and TechnologiesGuangdong Province Key Laboratory of Display Material and Technology and School of Electronics and Information TechnologySun Yat‐sen UniversityGuangzhou510275China
| | - Guoping Guo
- Key Laboratory of Quantum InformationCASUniversity of Science and Technology of ChinaHefei230026China
| | - Haizhou Lu
- Institute for Quantum Science and Engineering and Department of PhysicsSouth University of Science and Technology of ChinaShenzhen518055China
| | - Fei Liu
- State Key Laboratory of Optoelectronic Materials and TechnologiesGuangdong Province Key Laboratory of Display Material and Technology and School of Electronics and Information TechnologySun Yat‐sen UniversityGuangzhou510275China
| | - Hongtao He
- Institute for Quantum Science and Engineering and Department of PhysicsSouth University of Science and Technology of ChinaShenzhen518055China
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Lee S, In J, Chang JW, Seo K, Jung MH, Kim J, Kim B. Magnetotransport Properties and Kondo Effect Observed in a Ferromagnetic Single-Crystalline Fe1−xCoxSi Nanowire. Chem Asian J 2011; 7:406-11. [DOI: 10.1002/asia.201100679] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2011] [Indexed: 11/08/2022]
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Mishra SN, Mohanta SK, Davane SM, Kulkarni N, Ayyub P. Lattice size induced moment formation on isolated Fe atoms in nanocrystalline Nb. PHYSICAL REVIEW LETTERS 2010; 105:147203. [PMID: 21230864 DOI: 10.1103/physrevlett.105.147203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2010] [Indexed: 05/30/2023]
Abstract
Measurements of the local susceptibility and 3d spin relaxation rate for single Fe impurities embedded in a nanocrystalline Nb host indicates the emergence of a local moment on Fe at and below a critical size of 11 nm. Our ab initio electronic structure calculations show that the moment formation occurs due to Stoner enhancement arising from a size dependent lattice expansion and a consequent shift in the Fermi level. We also show that a size-induced positive host spin polarization of the Nb-4d band electrons strongly influences the fluctuation rate of the Fe moment.
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Affiliation(s)
- S N Mishra
- Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai-400005, India
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Ujsághy O, Jakovác A, Zawadowski A. Role of surface anisotropy for magnetic impurities in electron dephasing and energy relaxation and their size effect. PHYSICAL REVIEW LETTERS 2004; 93:256805. [PMID: 15697928 DOI: 10.1103/physrevlett.93.256805] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2004] [Indexed: 05/24/2023]
Abstract
Recently the electron dephasing and energy relaxation due to different magnetic impurities have been extensively investigated experimentally in thin wires, and in this Letter these quantities are theoretically studied. It was shown earlier that a magnetic impurity in a metallic host with strong spin-orbit interaction experiences a surface anisotropy of the form H=K(d)(nS)(2) which causes size effects for impurities with integer spin. Here we show that the dephasing and the energy relaxation are influenced by the surface anisotropy in very different ways for integer spin having a singlet ground state. That must result also in strong size effects and may resolve the puzzle between the concentrations estimated from the two kinds of experiments.
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Affiliation(s)
- O Ujsághy
- Budapest University of Technology and Economics, Institute of Physics and Research group, Theory of Condensed Matter of Hungarian Academy of Sciences, H-1521 Budapest, Hungary
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Seynaeve E, Temst K, Aliev FG, Gladilin VN, Fomin VM, Devreese JT. Impurity spin magnetization of thin Fe doped Au films. PHYSICAL REVIEW LETTERS 2000; 85:2593-2596. [PMID: 10978115 DOI: 10.1103/physrevlett.85.2593] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/1999] [Indexed: 05/23/2023]
Abstract
In order to probe the influence of the surface-induced anisotropy on the impurity spin magnetization, we measure the anomalous Hall effect in thin AuFe films at magnetic fields up to 15 T. The observed suppression of the anomalous Hall resistivity at low fields as well as the appearance of a minimum in the differential Hall resistivity at higher fields can be explained by our theoretical model, which takes into account the influence of a polycrystalline film structure on the surface-induced anisotropy. Our results imply that the apparent discrepancy between different experimental results for the size effects in dilute magnetic alloys can be linked to a different microstructure of the samples.
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Affiliation(s)
- E Seynaeve
- Laboratorium voor Vaste-Stoffysica en Magnetisme, Katholieke Universiteit Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium
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Zaránd G, Udvardi L. Enhancement of the Kondo temperature of magnetic impurities in metallic point contacts due to the fluctuations of the local density of states. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:7606-7609. [PMID: 9984415 DOI: 10.1103/physrevb.54.7606] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Eom J, Neuttiens G, Strunk C, Bruynseraede Y, Chandrasekhar V. Asymmetric Nonlinear Differential Resistance of Mesoscopic AuFe Spin-Glass Wires. PHYSICAL REVIEW LETTERS 1996; 77:2276-2279. [PMID: 10061903 DOI: 10.1103/physrevlett.77.2276] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Roth C, Sürgers C, Löhneysen H. Electronic transport and Kondo effect in La1-xCex films. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:3454-3461. [PMID: 9986246 DOI: 10.1103/physrevb.54.3454] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Mydosh JA, Yanson IK. Size-dependence study of the spin glass CuMn (1%). PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:15106-15112. [PMID: 9983308 DOI: 10.1103/physrevb.53.15106] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Sorensen ES, Affleck I. Scaling theory of the Kondo screening cloud. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:9153-9167. [PMID: 9982417 DOI: 10.1103/physrevb.53.9153] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Újsághy O, Zawadowski A, Gyorffy BL. Spin-orbit-induced magnetic anisotropy for impurities in metallic samples of reduced dimensions: Finite size dependence in the Kondo effect. PHYSICAL REVIEW LETTERS 1996; 76:2378-2381. [PMID: 10060682 DOI: 10.1103/physrevlett.76.2378] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Klotzkin D, Isaacson M. Determination of Cr particle sizes in thin dilute Cr-in-Cu films from measurement statistics. Ultramicroscopy 1995. [DOI: 10.1016/0304-3991(95)00056-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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Yanson IK, Fisun VV, Hesper R, Khotkevich AV, Krans JM, Mydosh JA. Size dependence of Kondo scattering in point contacts. PHYSICAL REVIEW LETTERS 1995; 74:302-305. [PMID: 10058354 DOI: 10.1103/physrevlett.74.302] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Lane KR, Park M, Isaacson MS, Parpia JM. Use of finite size and applied magnetic field to characterize the interimpurity interaction in a spin glass. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:945-953. [PMID: 9978244 DOI: 10.1103/physrevb.51.945] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Meir Y, Wingreen NS. Spin-orbit scattering and the Kondo effect. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 50:4947-4950. [PMID: 9976819 DOI: 10.1103/physrevb.50.4947] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Kanskar M, Wybourne MN. Measurement of the acoustic-phonon mean free path in a free-standing metal film. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 50:168-172. [PMID: 9974528 DOI: 10.1103/physrevb.50.168] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Chandrasekhar V, Santhanam P, Penebre NA, Webb RA, Vloeberghs H, Bruynseraede Y. Absence of size dependence of the Kondo resistivity. PHYSICAL REVIEW LETTERS 1994; 72:2053-2056. [PMID: 10055776 DOI: 10.1103/physrevlett.72.2053] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Palstra TT, Steigerwald ML, Ramirez AP, Kwon Y, Stuczynski SM, Schneemeyer LF, Waszczak JV, Zaanen J. Electron correlations on a mesoscopic scale: Magnetic properties of transition metal telluride cluster compounds. PHYSICAL REVIEW LETTERS 1993; 71:1768-1771. [PMID: 10054493 DOI: 10.1103/physrevlett.71.1768] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Bergmann G, Shieh W, Huberman M. Ruderman-Kittel-Kasuya-Yosida interaction in thin wires. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 46:8607-8609. [PMID: 10002632 DOI: 10.1103/physrevb.46.8607] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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