Anomalous specific-heat jump in the heavy-fermion superconductor CeCoIn5
Yunkyu Bang, A. V. Balatsky
DOI 10.1103/PhysRevB.69.212504 · Physical Review B
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Abstract
We studied the anomalously large specific-heat jump and its systematic change with pressure in the CeCoIn5 superconductor. Starting with a general free-energy functional of a coupled electron–boson system, we derived an analytic result of the specific-heat jump of the strong-coupling superconductor occurring in the coupled electron-boson system. Then using the spin-fermion model, we calculated the specific-heat coefficient C(T)/T both for the normal and superconducting states and showed a good agreement with the experiments on CeCoIn5. Our result also demonstrated that the specific-heat coefficient C(T)/T of a coupled electron-boson system can be freely interpreted as a renormalization either of the electronic or of the bosonic degrees of freedom.
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 unresolved | onset |
| CeCoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.7 | 1.5 GPa | onset |
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