Mesoscopic Competition of Superconductivity and Ferromagnetism: Conductance Peak Statistics for Metallic Grains

S. Schmidt and Y. Alhassid
Phys. Rev. Lett. 101, 207003 – Published 13 November 2008

Abstract

We investigate the competition between superconductivity and ferromagnetism in chaotic ultrasmall metallic grains in a regime where both phases can coexist. We use an effective Hamiltonian that combines a BCS-like pairing term and a ferromagnetic Stoner-like spin exchange term. We study the transport properties of the grain in the Coulomb-blockade regime and identify signatures of the coexistence of pairing and exchange correlations in the mesoscopic fluctuations of the conductance peak spacings and peak heights.

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  • Received 10 February 2008

DOI:https://doi.org/10.1103/PhysRevLett.101.207003

©2008 American Physical Society

Authors & Affiliations

S. Schmidt and Y. Alhassid

  • Center for Theoretical Physics, Sloane Physics Laboratory, Yale University, New Haven, Connecticut 06520, USA

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Vol. 101, Iss. 20 — 14 November 2008

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