Heat capacity study of BaFe$_{2}$As$_{2}$

ORAL

Abstract

We report heat capacity measurements on high quality single crystalline BaFe$_{2}$As$_{2}$ between 2 and 300 K in magnetic fields to 14 T. The sample, synthesized by a modified self-flux Bridgman method, shows no evidence of magnetic impurities. The low-temperature heat-capacity data give the electron density of states. The relation of the heat-capacity data to resistivity and magnetization measurements near the 140 K magnetic and structural phase transitions of both as-grown and annealed samples are discussed.

*Work supported by the Director, Office of Science, Office of Basic Energy Sciences, U.S. Department of Energy, under Contract No. DE-AC02-05CH11231 and Office of Basic Energy Sciences US DOE DE-AC03-76SF008.

–

Authors

  • Costel R. Rotundu

    • Lawrence Berkeley National Laboratory

  • Norman E. Phillips

    • Department of Chemistry, University of California, Berkeley and Lawrence Berkeley National Laboratory

  • Stephen D. Wilson

    • Lawrence Berkeley National Laboratory

  • Ahram Kim

    • Department of Physics, University of California, Berkeley

  • Giovanni Pinuellas

    • Department of Physics, University of California, Berkeley

  • Byron K. Freelon

    • Department of Physics, University of California, Berkeley

  • Edith Bourret-Courchesne

    • Lawrence Berkeley National Laboratory

  • Robert J. Birgeneau

    • Lawrence Berkeley National Laboratory, Department of Physics and Department of Materials Science and Engineering, University of California, Berkeley