Sign Reversal of Field-Angle Resolved Heat Capacity Oscillations in a Heavy Fermion Superconductor CeCoIn5 and dx2−y2 Pairing Symmetry
K. An, T. Sakakibara, R. Settai, Y. Onuki, M. Hiragi, M. Ichioka, K. Machida
DOI 10.1103/PhysRevLett.104.037002 · Physical Review Letters
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Abstract
To identify the superconducting gap symmetry in CeCoIn5 (Tc=2.3 K), we measured the angle-resolved specific heat (Cϕ) in a field rotated around the c axis down to a very low temperature, 0.05Tc, and made detailed theoretical calculations. In a field of 1 T, a sign reversal of the fourfold angular oscillation in Cϕ was observed at T≃0.1Tc upon entering a quasiclassical regime where the maximum of Cϕ corresponds to the antinodal direction, coinciding with the angle-resolved density of states (ADOS) calculation. The Cϕ behavior, which exhibits minima along the [110] directions, unambiguously allows us to conclude dx2−y2 symmetry of this system. The ADOS-quasiclassical region is confined to a narrow T and H domain within T/Tc∼0.1 and 1.5 T (0.13Hc2).
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 | onset |
| CeRhIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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