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Low-Energy Quasiparticles Probed by Heat Transport in the Iron Based Superconductor LaFePO by Sutherland, Michael; Dunn, J.; Toews, William; O'Farrell, Eoin; Analytis, James; Fisher, Ian; Hill, R. W. is a scholarly article available to read on EtoBox.

What is Low-Energy Quasiparticles Probed by Heat Transport in the Iron Based Superconductor LaFePO about?

We have measured the thermal conductivity of the iron pnictide superconductor LaFePO down to temperatures as low as T=60mK and in magnetic fields up to 5 T. The data shows a large residual contribution that is linear in temperature, consistent with the presence of low energy electronic quasiparticles. We interpret the magnitude of the linear term, as well as the field and temperature dependence of thermal transport in several pairing scenarios. The presence of an unusual supralinear temperature dependence of the electronic thermal conductivity in zero magnetic field, and a high scattering rate with minimal Tc suppression argues for a sign-changing nodal s+/- state.

Author

Sutherland, Michael; Dunn, J.; Toews, William; O'Farrell, Eoin; Analytis, James; Fisher, Ian; Hill, R. W.

Published

2011

Language

EN