Journal
PHYSICAL REVIEW B
Volume 80, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.024519
Keywords
antiferromagnetic materials; calcium compounds; electrical resistivity; fluctuations in superconductors; iron compounds; magnetic susceptibility; type II superconductors
Funding
- U.S. Department of Energy/Office of Science
- Los Alamos LDRD program
- KOSEF [2009-0058687]
- Korea government (MEST)
- Russian Foundation for Basic Research [09-02-00336]
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The antiferromagnet CaFe2As2 does not become superconducting when subject to ideal hydrostatic pressure conditions, where crystallographic and magnetic states also are well defined. By measuring electrical resistivity and magnetic susceptibility under quasihydrostatic pressure, however, we find that a substantial volume fraction of the sample is superconducting in a narrow pressure range where collapsed tetragonal and orthorhombic structures coexist. At higher pressures, the collapsed tetragonal structure is stabilized with the boundary between this structure and the phase of coexisting structures strongly dependent on pressure history. Fluctuations in magnetic degrees of freedom in the phase of coexisting structures appear to be important for superconductivity.
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