2008/09/30 by Hanoh Lee, Eunsung Park, Tuson Park +4 · 1 citation
Business, Management and Accounting · Materials Science · Physics and Astronomy · #Corporate Taxation and Avoidance #Iron-based superconductors research #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.80.024519
published as Phys. Rev. 80, 024519 (2009) · revised (6 pages, 5 figures) - includes additional experimental results
arxiv created 2009/07/02 · openalex publication_date 2009/07/31 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
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.