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Shiomi Y, Lustikova J, Saitoh E. Oscillatory Nernst effect in Pt|ferrite|cuprate-superconductor trilayer films. Sci Rep 2017; 7:5358. [PMID: 28706217 PMCID: PMC5509755 DOI: 10.1038/s41598-017-05747-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2017] [Accepted: 04/26/2017] [Indexed: 11/25/2022] Open
Abstract
Although magnetism and superconductivity hardly coexist in a single material, recent advances in nanotechnology and spintronics have brought to light their interplay in magnetotransport in thin-film heterostructures. Here, we found a periodic oscillation of Nernst voltage with respect to magnetic fields in Pt|LiFe5O8 (Pt|LFO) bilayers grown on a cuprate superconductor YBa2Cu3O7−x (YBCO). At high temperatures above the superconducting transition temperature (TC) of YBCO, spin Seebeck voltages originating in Pt|LFO layers are observed. As temperature decreases well below TC, the spin Seebeck voltage is suppressed and unconventional periodic voltage oscillation as a function of magnetic fields appears; such an oscillation emerging along the Hall direction in the superconducting state has not been observed yet. Dynamics of superconducting vortices pinned by surface precipitates seems responsible for the oscillatory Nernst effect.
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Affiliation(s)
- Y Shiomi
- Institute for Materials Research, Tohoku University, Sendai, 980-8577, Japan. .,Spin Quantum Rectification Project, ERATO, Japan Science and Technology Agency, Aoba-ku, Sendai, 980-8577, Japan.
| | - J Lustikova
- Institute for Materials Research, Tohoku University, Sendai, 980-8577, Japan
| | - E Saitoh
- Institute for Materials Research, Tohoku University, Sendai, 980-8577, Japan.,Spin Quantum Rectification Project, ERATO, Japan Science and Technology Agency, Aoba-ku, Sendai, 980-8577, Japan.,WPI Advanced Institute for Materials Research, Tohoku University, Sendai, 980-8577, Japan.,Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, 319-1195, Japan
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Moll PJW, Balicas L, Zhu X, Wen HH, Zhigadlo ND, Karpinski J, Batlogg B. Critical current oscillations in the intrinsic hybrid vortex state of SmFeAs(O,F). PHYSICAL REVIEW LETTERS 2014; 113:186402. [PMID: 25396384 DOI: 10.1103/physrevlett.113.186402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2014] [Indexed: 06/04/2023]
Abstract
In layered superconductors the order parameter may be modulated within the unit cell, leading to nontrivial modifications of the vortex core if the interlayer coherence length ξ(c)(T) is comparable to the interlayer spacing. In the iron pnictide SmFeAs(O,F) (T(c)≈50 K) this occurs below a crossover temperature T(⋆)≈41 K, which separates two regimes of vortices: anisotropic Abrikosov-like at high and Josephson-like at low temperatures. Yet in the transition region around T(⋆), hybrid vortices between these two characteristics appear. Only in this region around T(⋆) and for magnetic fields well aligned with the FeAs layers, we observe oscillations of the c-axis critical current j(c)(H) periodic in 1/sqrt[H] due to a delicate balance of intervortex forces and interaction with the layered potential. j(c)(H) shows pronounced maxima when a hexagonal vortex lattice is commensurate with the underlying crystal structure. The narrow temperature window in which oscillations are observed suggests a significant suppression of the order parameter between the superconducting layers in SmFeAs(O,F), despite its low coherence length anisotropy (γ(ξ)≈3-5).
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Affiliation(s)
- Philip J W Moll
- Laboratory for Solid State Physics, ETH Zurich, 8093 Zurich, Switzerland
| | - Luis Balicas
- National High Magnetic Field Laboratory (NHMFL), Tallahassee, Florida 32310, USA
| | - Xiyu Zhu
- Center for Superconducting Physics and Materials, National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China
| | - Hai-Hu Wen
- Center for Superconducting Physics and Materials, National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China
| | - Nikolai D Zhigadlo
- Laboratory for Solid State Physics, ETH Zurich, 8093 Zurich, Switzerland
| | - Janusz Karpinski
- Laboratory for Solid State Physics, ETH Zurich, 8093 Zurich, Switzerland
| | - Bertram Batlogg
- Laboratory for Solid State Physics, ETH Zurich, 8093 Zurich, Switzerland
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Novoselov KS, Geim AK, Dubonos SV, Hill EW, Grigorieva IV. Subatomic movements of a domain wall in the Peierls potential. Nature 2003; 426:812-6. [PMID: 14685231 DOI: 10.1038/nature02180] [Citation(s) in RCA: 87] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2003] [Accepted: 10/29/2003] [Indexed: 11/09/2022]
Abstract
The discrete nature of crystal lattices plays a role in virtually every material property. But it is only when the size of entities hosted by a crystal becomes comparable to the lattice period--as occurs for dislocations, vortices in superconductors and domain walls--that this discreteness is manifest explicitly. The associated phenomena are usually described in terms of a background Peierls 'atomic washboard' energy potential, which was first introduced for the case of dislocation motion in the 1940s. This concept has subsequently been invoked in many situations to describe certain features in the bulk behaviour of materials, but has to date eluded direct detection and experimental scrutiny at a microscopic level. Here we report observations of the motion of a single magnetic domain wall at the scale of the individual peaks and troughs of the atomic energy landscape. Our experiments reveal that domain walls can become trapped between crystalline planes, and that they propagate by distinct jumps that match the lattice periodicity. The jumps between valleys are found to involve unusual dynamics that shed light on the microscopic processes underlying domain-wall propagation. Such observations offer a means for probing experimentally the physics of topological defects in discrete lattices--a field rich in phenomena that have been subject to extensive theoretical study.
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Affiliation(s)
- K S Novoselov
- Department of Physics, University of Manchester, Manchester M13 9PL, UK
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Gordeev SN, Zhukov AA, Jansen AG, Gagnon R, Taillefer L. Oscillatory melting temperature of the vortex smectic phase in layered superconductors. PHYSICAL REVIEW LETTERS 2000; 85:4594-4597. [PMID: 11082604 DOI: 10.1103/physrevlett.85.4594] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2000] [Indexed: 05/23/2023]
Abstract
We report on transport measurements of YBa 2Cu 3O (7-delta) single crystals with different oxygen contents in the geometry B, J ||ab (J perpendicularB). Our data show that the vortices become confined between the Cu-O planes below a well-defined temperature at which the effective size 2xi of the vortex core is approximately equal to the period of the Cu-O layers. This confinement strongly increases the vortex liquid freezing temperature. A new melting line is found separating a vortex liquid and a smectic phase, which shows an oscillatory field dependence reflecting differences between commensurate and incommensurate smectic states.
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Affiliation(s)
- SN Gordeev
- Department of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ, United Kingdom
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Reichhardt C, Groth J, Olson CJ, Field SB, Nori F. Spatiotemporal dynamics and plastic flow of vortices in superconductors with periodic arrays of pinning sites. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:16108-16115. [PMID: 9985685 DOI: 10.1103/physrevb.54.16108] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Waldmann O, Lichtschlag G, Talalaevskii A, Kleiner R, Müller P, Steinmeyer F, Gerhäuser W. c-axis ac susceptibility in high-Tc superconductors. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:15478-15482. [PMID: 9985616 DOI: 10.1103/physrevb.54.15478] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Barr AL, Markert JT. Fine Structure in a High-Resolution Vortex Dissipation Study of YBa2 Cu3O7- delta. PHYSICAL REVIEW LETTERS 1996; 77:731-734. [PMID: 10062888 DOI: 10.1103/physrevlett.77.731] [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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Küpfer H, Zhukov AA, Will A, Jahn W, Meier-Hirmer R, Wolf T, Voronkova VI, Kläser M, Saito K. Anisotropy in the irreversible behavior of pointlike defects and twins in YBa2Cu3O7- delta single crystals with a peak effect. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:644-655. [PMID: 9984300 DOI: 10.1103/physrevb.54.644] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Enriquez H, Bontemps N, Fournier P, Kapitulnik A, Maignan A, Ruyter A. Analysis of the lock-in transition in Bi2Sr2CaCu2O8+ delta single crystals through microwave dissipation. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:R14757-R14760. [PMID: 9983348 DOI: 10.1103/physrevb.53.r14757] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Ziese M, Esquinazi P, Wagner P, Adrian H, Brongersma SH, Griessen R. Matching and surface barrier effects of the flux-line lattice in superconducting films and multilayers. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:8658-8670. [PMID: 9982379 DOI: 10.1103/physrevb.53.8658] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Karapetrov G, Tate J. Evidence for three-dimensional flux creep in thin-film Bi2Sr2CaCu2O8+ delta. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:3776-3783. [PMID: 9981508 DOI: 10.1103/physrevb.52.3776] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Martin JI, Velez M, Vicent JL. Multilayer pinning in a-axis-oriented EuBa2Cu3O7/PrBa2Cu3O7 superconducting superlattices. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:R3872-R3875. [PMID: 9981615 DOI: 10.1103/physrevb.52.r3872] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Ichioka M. Vortex lattice of layered superconductors in parallel magnetic fields. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:9423-9426. [PMID: 9977604 DOI: 10.1103/physrevb.51.9423] [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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Oussena M, Porter SJ, Gagnon R, Taillefer L. Vortex channeling along twin planes in YBa2Cu3O7-x. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:1389-1392. [PMID: 9978313 DOI: 10.1103/physrevb.51.1389] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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