Oscillatory Nernst effect in Pt|ferrite|cuprate-superconductor trilayer films

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 fi...

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Bibliographic Details
Published in:Scientific reports 2017-07, Vol.7 (1), p.5358-8, Article 5358
Main Authors: Shiomi, Y., Lustikova, J., Saitoh, E.
Format: Article
Language:English
Subjects:
639/766/119/1001
639/766/119/1003
639/766/119/544
639/766/119/997
High temperature
Humanities and Social Sciences
Magnetic fields
Magnetism
multidisciplinary
Nanotechnology
Science
Science (multidisciplinary)
Thin films
Transition temperatures
Voltage
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Summary: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|LiFe 5 O 8 (Pt|LFO) bilayers grown on a cuprate superconductor YBa 2 Cu 3 O 7− x (YBCO). At high temperatures above the superconducting transition temperature ( T C ) of YBCO, spin Seebeck voltages originating in Pt|LFO layers are observed. As temperature decreases well below T C , 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.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-017-05747-6