Effect of pressure on transport and magnetotransport properties in CaFe2As2 single crystals

M. S. Torikachvili, S. L. Bud’ko, N. Ni, P. C. Canfield, and S. T. Hannahs
Phys. Rev. B 80, 014521 – Published 24 July 2009

Abstract

The effects of pressure generated in a liquid-medium clamp pressure cell on the in-plane and c-axis resistance, temperature-dependent Hall coefficient, and low-temperature magnetoresistance in CaFe2As2 are presented. The TP phase diagram, including the observation of a complete superconducting transition in resistivity delineated in earlier studies is found to be highly reproducible. The Hall resistivity and low-temperature magnetoresistance are sensitive to different states/phases observed in CaFe2As2. Auxiliary measurements under uniaxial c-axis pressure are in general agreement with the liquid-medium clamp cell results with some difference in critical pressure values and pressure derivatives. The data may be viewed as supporting the potential importance of nonhydrostatic components of pressure in inducing superconductivity in CaFe2As2.

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  • Received 25 May 2009

DOI:https://doi.org/10.1103/PhysRevB.80.014521

©2009 American Physical Society

Authors & Affiliations

M. S. Torikachvili

  • Department of Physics, San Diego State University, San Diego, California 92182-1233, USA

S. L. Bud’ko, N. Ni, and P. C. Canfield

  • Ames Laboratory U.S. DOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA

S. T. Hannahs

  • National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, USA

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Vol. 80, Iss. 1 — 1 July 2009

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