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

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Torikachvili, M. S.
Bud'ko, Sergey L.
Ni, Ni
Hannahs, S. T.
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American Physical Society
Canfield, Paul
Distinguished Professor
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Physics and Astronomy
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Ames National Laboratory

Ames National Laboratory is a government-owned, contractor-operated national laboratory of the U.S. Department of Energy (DOE), operated by and located on the campus of Iowa State University in Ames, Iowa.

For more than 70 years, the Ames National Laboratory has successfully partnered with Iowa State University, and is unique among the 17 DOE laboratories in that it is physically located on the campus of a major research university. Many of the scientists and administrators at the Laboratory also hold faculty positions at the University and the Laboratory has access to both undergraduate and graduate student talent.

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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 T-P 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.
This article is published as Torikachvili, M. S., S. L. Bud’Ko, N. Ni, P. C. Canfield, and S. T. Hannahs. "Effect of pressure on transport and magnetotransport properties in CaFe 2 As 2 single crystals." Physical Review B 80, no. 1 (2009): 014521. DOI: 10.1103/PhysRevB.80.014521. Copyright 2009 American Physical Society. Posted with permission.