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Absence of superconductivity in single-phase CaFe2As2 under hydrostatic pressure

W. Yu, A. A. Aczel, T. J. Williams, S. L. Bud’ko, N. Ni, P. C. Canfield, and G. M. Luke
Phys. Rev. B 79, 020511(R) – Published 30 January 2009

Abstract

Recent high-pressure studies found that structural/magnetic phase transitions are very pressure sensitive in CaFe2As2 and that superconductivity can be achieved under modest pressure, although details of the sharpness and temperature of transitions vary between liquid medium and gas medium measurements. To better understand this issue, we performed high-pressure susceptibility and transport studies on CaFe2As2, using helium as the pressure medium. The signatures of the transitions to the low-temperature orthorhombic and collapsed tetragonal phases remained exceptionally sharp, and no signature of bulk superconductivity was found under our hydrostatic conditions. Our results suggest that superconductivity in CaFe2As2 is associated with a low-temperature, multicrystallographic-phase sample that is the result of nonhydrostatic conditions associated with the combination of a first-order structural phase transition and frozen liquid media.

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  • Received 20 November 2008

DOI:https://doi.org/10.1103/PhysRevB.79.020511

©2009 American Physical Society

Authors & Affiliations

W. Yu1,3,*, A. A. Aczel1, T. J. Williams1, S. L. Bud’ko2, N. Ni2, P. C. Canfield2, and G. M. Luke1,4

  • 1Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S 4M1
  • 2Department of Physics and Astronomy and Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA
  • 3Department of Physics, Renmin University of China, Beijing 100872, China
  • 4Canadian Institute for Advanced Research, Toronto, Canada, M5G 1Z8

  • *wqyu_phy@ruc.edu.cn

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Vol. 79, Iss. 2 — 1 January 2009

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