Nonlocality and strong coupling in the heavy fermion superconductor CeCoIn5: A penetration depth study

Elbert E.M. Chia, D. J. Van Harlingen, M. B. Salamon, Brian D. Yanoff, I. Bonalde, J. L. Sarrao

Research output: Contribution to journalArticle

Abstract

We report measurements of the magnetic penetration depth λ in single crystals of CeCoIn5 down to ∼0.14 K using a tunnel-diode-based, self-inductive technique at 28 MHz. While the in-plane penetration depth tends to follow a power law, λ∼T3/2, the data are better described as a crossover between linear (T≫T*) and quadratic (T≪T*) behavior, with T* the crossover temperature in the strongr-coupling limit. The c-axis penetration depth λ is linear in T. Both the magnitude of T* and the different temperature dependencies in the two directions rule out impurity effects, but instead indicate that the penetration depth is governed by nonlocal electrodynamics in a d-wave superconductor with line nodes along the c axis. This is experimental confirmation of directional nonlocality, predicted theoretically by Kosztin and Leggett.

Original languageEnglish (US)
Article number014527
Pages (from-to)145271-145274
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume67
Issue number1
StatePublished - Jan 1 2003

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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