POMPEO, N.; TOROKHTII, K.; CIRILLO, C.; SAMOKHVALOV, A. V.; ILYINA, E. A.; ATTANASIO, C.; BUZDIN, Alexandre I.; SILVA, E.

doi:10.1103/PhysRevB.90.064510

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Licencia de uso del documento

http://creativecommons.org/licenses/by-nc/

POMPEO, N.
Dipartimento di Ingegneria [Roma]

TOROKHTII, K.
Dipartimento di Ingegneria [Roma]

CIRILLO, C.
CNR-SPIN Salerno and Dipartimento di Fisica "E. R. CAianiello"

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Article de revue

Este ítem está publicado en

Physical Review B: Condensed Matter and Materials Physics (1998-2015). 2014-08-21, vol. 90, n° 6, p. 064510 (1-7)

American Physical Society

Resumen en inglés

In structures made up of alternating superconducting and ferromagnet layers (S/F/S heterostructures), it is known that the macroscopic quantum wave function of the ground state changes its phase difference across the F layer from 0 to π under certain temperature and geometrical conditions, hence the name "0-π" for this crossover. We present here a joint experimental and theoretical demonstration that 0-π is a true thermodynamic phase transition. Microwave measurements of the temperature dependence of the London penetration depth in Nb/Pd0.84Ni0.16/Nb trilayers reveal a sudden, unusual decrease of the density of the superconducting condensate (square modulus of the macroscopic quantum wave function) with decreasing temperature, which is predicted by the theory here developed as a transition from the 0 state to the π state. Our result for the jump of the amplitude of the order parameter is a thermodynamic manifestation of such a temperature-driven quantum transition.< Leer menos

Palabras clave en inglés

Multilayers

superlattices

Magnetic properties including vortex structures and related phenomena

Proximity effects

Andreev reflection

SN and SNS junctions

Surface impedance

heterostructures

DOI

http://dx.doi.org/10.1103/PhysRevB.90.064510

Proyecto ANR

Etats de Majorana et d'Andreev dans des circuits hybrides combinant des matériaux magnétiques et supraconducteurs - ANR-12-BS04-0016

Orígen

Importado de Hal

Centros de investigación

Laboratoire Ondes et Matière d'Aquitaine (LOMA) - UMR 5798