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 quasi-hydrostatic 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.
@article{arxiv.0809.3550,
title = {Presure-Induced Superconducting State of Antiferromagnetic CaFe$_2$As$_2$},
author = {Hanoh Lee and Eunsung Park and Tuson Park and V. A. Sidorov and F. Ronning and E. D. Bauer and J. D. Thompson},
journal= {arXiv preprint arXiv:0809.3550},
year = {2009}
}
Comments
revised (6 pages, 5 figures) - includes additional experimental results