Thermal expansion and pressure derivatives of $T_c$ in Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$ single crystals

ORAL

Abstract

We present heat capacity and anisotropic thermal expansion data for Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$. Evolution of structural/magnetic phase transition with Co-concentration is clearly detected by both measurements. Anisotropic pressure derivatives of the superconducting transition temperature are evaluated via the Ehrenfest relations and compared with directly measured hydrostatic $dT_c/dP$.

*Supported by US DOE BES DE-AC02-07CH11358, NSF DMR- 0805335 and NSF DMR-0704406.

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Authors

  • S.L. Bud'ko

    • Ames Laboratory and Iowa State University
    • Ames Laboratory and Physics Department and Astronomy, Iowa State University, Ames, IA
    • Ames Laboratory
    • Ames Laboratory, US DOE and Iowa State University
    • Ames Laboratory/Iowa State University
    • Ames Laboratory/Department of Physics and Astronomy
    • Ames laboratory

  • M.S. Torikachvili

    • Physics Department, San Diego State University

  • N. Ni

  • J.-Q. Yan

  • P.C. Canfield

    • Ames Laboratory/Iowa State University

  • G.M. Schmiedeshoff

    • Physics Department, Occidental College