Far-IR excitations in Cd2Re2O7 in the normal and superconducting states

Cd2Re2O7 is a pyrochlore superconductor with a transition temperature Tc near 1 K. We report on the far-infrared optical properties of Cd2Re2O7 at temperatures above and below Tc with a particular emphasis on changes in the spectrum below Tc. Seventeen phonon modes are observed in the normal state o...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2012-12, Vol.24 (50), p.505701-505701
Main Authors: Hajialamdari, M, Razavi, F S, Crandles, D A, Kremer, R K, Reedyk, M
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Optical properties
Physics
Properties of type I and type II superconductors
Superconductivity
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Summary:Cd2Re2O7 is a pyrochlore superconductor with a transition temperature Tc near 1 K. We report on the far-infrared optical properties of Cd2Re2O7 at temperatures above and below Tc with a particular emphasis on changes in the spectrum below Tc. Seventeen phonon modes are observed in the normal state optical conductivity spectrum of Cd2Re2O7 at low temperatures in good agreement with a factor group analysis. In the superconducting state, a softening (∼1 cm−1) of the phonon modes at 35 and 61 cm−1 occurs and thermal reflectance spectra show the development of two additional strong absorption features, near 9.6 and 19.3 cm−1. The dominant presence of lattice vibrational modes in the optical spectrum suggests that electron-phonon interaction plays an important role in the normal and superconducting state properties of Cd2Re2O7.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/24/50/505701