The effect of quasiparticle self-energy on Cd2Re2O7 superconductor

Author:

Razavi F.S.1,Rohanizadegan Y.1,Hajialamdari M.1,Reedyk M.1,Kremer R.K.2,Mitrović B.1

Affiliation:

1. Department of Physics, Brock University, St. Catharines, ON L2S 3A1, Canada.

2. Max-Planck-Institut für Festkörperforschung, Heisenbergstraβe 1, 70569 Stuttgart, Germany.

Abstract

The magnitude and the temperature dependence of the superconducting order parameter Δ(T) of single crystals of Cd2Re2O7 (Tc = 1.02 K) was measured using point-contact spectroscopy. To fit the conductance spectra and to extract the order parameter at different temperatures we generalized the Blonder–Tinkham–Klapwijk theory by including the self-energy of the quasiparticles into the Bogoliubov equations. This modification enabled excellent fits of the conductance spectra. Δ(T) increases steeply below the superconducting transition temperature of 1.02 K and levels off below ∼0.8 K at a value of 0.22(1) meV, ≈40% larger than the BCS value. Our results indicate the presence of a strong electron–phonon interaction and an enhanced quasiparticle damping and may be related to a possible phase transition within the superconducting region at ∼0.8 K.

Publisher

Canadian Science Publishing

Subject

General Physics and Astronomy

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