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Journal Article

The effect of quasiparticle self-energy on Cd2Re2O7 superconductor

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Razavi,  F.
Scientific Facility Thin Film Technology (Gennady Logvenov), Max Planck Institute for Solid State Research, Max Planck Society;
Former Scientific Facilities, Max Planck Institute for Solid State Research, Max Planck Society;

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Kremer,  R. K.
Former Scientific Facilities, Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Razavi, F., Rohanizadegan, Y., Hajialamdari, M., Reedyk, M., Kremer, R. K., & Mitrovic, B. (2015). The effect of quasiparticle self-energy on Cd2Re2O7 superconductor. Canadian Journal of Physics, 93(12), 1646-1650.


Cite as: https://hdl.handle.net/21.11116/0000-000E-CABA-D
Abstract
The magnitude and the temperature dependence of the superconducting order parameter Delta(T) of single crystals of Cd2Re2O7 (T-c = 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. Delta(T) increases steeply below the superconducting transition temperature of 1.02 K and levels off below similar to 0.8 K at a value of 0.22(1) meV, approximate to 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 similar to 0.8 K.