Universal Bound to the Amplitude of the Vortex Nernst Signal in Superconductors.

Autor:	Rischau CW; Laboratoire de Physique et d'Étude des Matériaux (ESPCI Paris-CNRS-Sorbonne Université), PSL Research University, 75005 Paris, France., Li Y; Laboratoire de Physique et d'Étude des Matériaux (ESPCI Paris-CNRS-Sorbonne Université), PSL Research University, 75005 Paris, France., Fauqué B; JEIP, USR 3573 CNRS, Collège de France, PSL Research University, 75005 Paris, France., Inoue H; Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA., Kim M; Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA., Bell C; Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA., Hwang HY; Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA., Kapitulnik A; Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA., Behnia K; Laboratoire de Physique et d'Étude des Matériaux (ESPCI Paris-CNRS-Sorbonne Université), PSL Research University, 75005 Paris, France.
Jazyk:	angličtina
Zdroj:	Physical review letters [Phys Rev Lett] 2021 Feb 19; Vol. 126 (7), pp. 077001.
DOI:	10.1103/PhysRevLett.126.077001
Abstrakt:	A liquid of superconducting vortices generates a transverse thermoelectric response. This Nernst signal has a tail deep in the normal state due to superconducting fluctuations. Here, we present a study of the Nernst effect in two-dimensional heterostructures of Nb-doped strontium titanate (STO) and in amorphous MoGe. The Nernst signal generated by ephemeral Cooper pairs above the critical temperature has the magnitude expected by theory in STO. On the other hand, the peak amplitude of the vortex Nernst signal below T_{c} is comparable in both and in numerous other superconductors despite the large distribution of the critical temperature and the critical magnetic fields. In four superconductors belonging to different families, the maximum Nernst signal corresponds to an entropy per vortex per layer of ≈k_{B}ln2.
Databáze:	MEDLINE
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