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
DOI 10.1103/PhysRevB.67.014527 · Physical Review B
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Abstract
We report measurements of the magnetic penetration depth λ in single crystals of CeCoIn5 down to ∼0.14K 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 strong-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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CeCoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.3 | Pressure not reported | unknown |
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