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Nonlinear thermoelectric effects in high-field superconductor-ferromagnet tunnel junctions

Kolenda, Stefan 1; Machon, Peter; Beckmann, Detlef 1; Belzig, Wolfgang
1 Institut für Nanotechnologie (INT), Karlsruher Institut für Technologie (KIT)


Background: Thermoelectric effects result from the coupling of charge and heat transport and can be used for thermometry, cooling and harvesting of thermal energy. The microscopic origin of thermoelectric effects is a broken electron-hole symmetry, which is usually quite small in metal structures. In addition, thermoelectric effects decrease towards low temperatures, which usually makes them vanishingly small in metal nanostructures in the sub-Kelvin regime.

Results: We report on a combined experimental and theoretical investigation of thermoelectric effects in superconductor/ferromagnet hybrid structures. We investigate the dependence of thermoelectric currents on the thermal excitation, as well as on the presence of a dc bias voltage across the junction.

Conclusion: Large thermoelectric effects are observed in superconductor/ferromagnet and superconductor/normal-metal hybrid structures. The spin-independent signals observed under finite voltage bias are shown to be reciprocal to the physics of superconductor/normal-metal microrefrigerators. The spin-dependent thermoelectric signals in the linear regime are due to the coupling of spin and heat transport, and can be used to design more efficient refrigerators.

Volltext §
DOI: 10.5445/IR/1000061619
DOI: 10.3762/bjnano.7.152
Zitationen: 28
Zitationen: 27
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2016
Sprache Englisch
Identifikator ISSN: 2190-4286
KITopen-ID: 1000061619
HGF-Programm 43.21.02 (POF III, LK 01) Quantum Properties of Nanostructures
Erschienen in Beilstein journal of nanotechnology
Verlag Beilstein-Institut
Band 7
Seiten 1579-1585
Schlagwörter spintronics, superconductor-ferromagnet hybrids, thermoelectricity
Nachgewiesen in Dimensions
Web of Science
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