Optical conductivity of the heavy fermion superconductor CeCoIn5

E. J. Singley; D. N. Basov; E. D. Bauer; M. B. Maple

doi:10.1103/PhysRevB.65.161101

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Optical conductivity of the heavy fermion superconductor CeCoIn5

E. J. Singley, D. N. Basov, E. D. Bauer, M. B. Maple

DOI 10.1103/PhysRevB.65.161101 · Physical Review B

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Abstract

The electrodynamic response of the heavy fermion compound CeCoIn5 is studied via infrared spectroscopy. Below 100 K the high temperature Drude-like conductivity evolves into two distinct components. At low energies a narrow mode is observed which is characteristic of the response of heavy quasiparticles. At higher energies a gap structure emerges with 2Δ∼600 cm−1 (75 meV). Examination of the fine features of the optical conductivity reveals additional absorption below the gap. This intergap resonance can be qualitatively understood as a Holstein band, where the quasiparticles are strongly coupled to a collective mode at ∼65 cm−1 (8 meV).

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
CeIrIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.4	Pressure not reported	unknown
CeIn3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.2	2.5 GPa	unknown