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Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2014

Thermodynamic nature of the 0-π quantum transition in superconductor/ferromagnet/superconductor trilayers

Résumé

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.
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Dates et versions

hal-01071839 , version 1 (26-02-2015)

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Paternité - Pas d'utilisation commerciale

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N. Pompeo, K. Torokhtii, C. Cirillo, A. V. Samokhvalov, E. A. Ilyina, et al.. Thermodynamic nature of the 0-π quantum transition in superconductor/ferromagnet/superconductor trilayers. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2014, 90 (6), pp.064510 (1-7). ⟨10.1103/PhysRevB.90.064510⟩. ⟨hal-01071839⟩

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