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Heat capacity measurements on FeAs-based compounds: a thermodynamic probe of electronic and magnetic states

Baker, P. J., Giblin, Sean, Pratt, F. L., Liu, R. H., Wu, G., Chen, X. H., Pitcher, M. J., Parker, D. R., Clarke, S. J. and Blundell, S. J. 2009. Heat capacity measurements on FeAs-based compounds: a thermodynamic probe of electronic and magnetic states. New Journal of Physics 11 , 025010. 10.1088/1367-2630/11/2/025010

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Abstract

We report heat capacity measurements of the pnictide materials SmFeAsO1-xFx, NdFeAsO, LaFeAsO1-xFx and LiFeAs. For SmFeAsO1- xFx, with x close to 0.1, we use 3He measurements to demonstrate a transfer of entropy from the peak at TN to a previously unidentified ~2 K feature, which grows with increasing doping. Our results on the Sm samples are compared with a similarly doped La sample to elucidate the crystal field levels of the Sm3+ ion at 0, 20 and 45 meV, which lead to a Schottky-like anomaly, and also show that there is a significant increase in the Sommerfeld coefficient γ when La is replaced by Sm or Nd. The lattice contribution to the heat capacity of the superconducting oxypnictides is found to vary negligibly with chemical substitution. We also present a heat capacity measurement of LiFeAs showing the feature at Tc, which is significantly rounded and much smaller than the BCS value.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Publisher: IOP Publishing
ISSN: 1367-2630
Last Modified: 04 Jun 2017 04:36
URI: http://orca.cf.ac.uk/id/eprint/41501

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