Evidence from neutron diffraction for superconductivity in the stabilized tetragonal phase of CaFe2As2 under uniaxial pressure

K. Prokeš; A. Kreyssig; B. Ouladdiaf; D. K. Pratt; N. Ni; S. L. Bud’ko; P. C. Canfield; R. J. McQueeney; D. N. Argyriou; A. I. Goldman

doi:10.1103/PhysRevB.81.180506

Evidence from neutron diffraction for superconductivity in the stabilized tetragonal phase of CaFe2As2 under uniaxial pressure

K. Prokeš, A. Kreyssig, B. Ouladdiaf, D. K. Pratt, N. Ni, S. L. Bud’ko, P. C. Canfield, R. J. McQueeney, D. N. Argyriou, A. I. Goldman

DOI 10.1103/PhysRevB.81.180506 · Physical Review B

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Abstract

CaFe2As2 single crystals under uniaxial pressure applied along the c axis exhibit the coexistence of several structural phases at low temperatures. We show that the room-temperature tetragonal phase is stabilized at low temperatures for pressures above 0.06 GPa, and its weight fraction attains a maximum in the region where superconductivity is observed under applied uniaxial pressure. Simultaneous resistivity measurements strongly suggest that this phase is responsible for the superconductivity in CaFe2As2 found below 10 K in samples subjected to nonhydrostatic pressure conditions.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
CaFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	10	0.1 GPa	onset