Low-frequency excitation in the optical properties of superconducting CeCoIn5
G. V. Sudhakar Rao, S. Ocadlik, M. Reedyk, C. Petrovic
DOI 10.1103/PhysRevB.80.064512 · Physical Review B
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Abstract
The far-infrared optical response of CeCoIn5, a superconducting heavy fermion metal with a TC of 2.3 K, was investigated from 5–40 cm−1 at temperatures from 0.5–2.5 K using a polarizing interferometer and a He3 cryostat. A strong absorption feature is revealed at low temperatures which appears to be a gap in the density of states, reminiscent of the energy gap seen in the hidden order state in URu2Si2. The depth of the spectral structure decreases with increasing temperature from 0.5 to 2.5 K indicating that the characteristic temperature for this behavior is close to the superconducting TC. A peak in the superconducting state Kramers-Kronig-derived optical conductivity occurs just above the gap at 1.5 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 unresolved | unknown |
| URu2Si2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1 | Pressure not reported | unknown |
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