Low-energy quasiparticles probed by heat transport in the iron-based superconductor LaFePO

Mike Sutherland, J. Dunn, W. H. Toews, Eoin O’Farrell, James Analytis, Ian Fisher, and R. W. Hill
Phys. Rev. B 85, 014517 – Published 23 January 2012

Abstract

We have measured the thermal conductivity of the iron pnictide superconductor LaFePO down to temperatures as low as T=60 mK and in magnetic fields up to 5 T. The data show 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.

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  • Received 23 September 2011

DOI:https://doi.org/10.1103/PhysRevB.85.014517

©2012 American Physical Society

Authors & Affiliations

Mike Sutherland1, J. Dunn2, W. H. Toews2, Eoin O’Farrell1, James Analytis3,4, Ian Fisher3,4, and R. W. Hill2

  • 1Cavendish Laboratory, University of Cambridge, J.J. Thomson Ave, Cambridge, CB3 0HE, United Kingdom
  • 2GWPI and Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario, Canada, N2L 3G1
  • 3Geballe Laboratory for Advanced Materials and Department of Applied Physics, Stanford University, Stanford, California 94305, USA
  • 4Stanford Institute of Energy and Materials Science, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park 94025, California 94305, USA

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Issue

Vol. 85, Iss. 1 — 1 January 2012

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