2008/11/30 by Weiqiang Yu, W. Yu, A. A. Aczel +7
Business, Management and Accounting · Materials Science · Physics and Astronomy · #Condensed matter physics #Corporate Taxation and Avoidance #Hydrostatic equilibrium #Hydrostatic pressure #Iron-based superconductors research #Materials science #Phase (matter) #Phase transition #Physics #Quantum mechanics #Superconductivity #Tetragonal crystal system #Thermodynamics #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.79.020511
4 pages, 3 figures, Accepted by Physical Review B
arxiv created 2009/01/14 · openalex publication_date 2009/01/30 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Recent high-pressure studies found that structural/magnetic phase transitions are very pressure sensitive in CaFe2As2 and that superconductivity can be achieved under modest pressure, although details of the sharpness and temperature of transitions vary between liquid medium and gas medium measurements. To better understand this issue, we performed high-pressure susceptibility and transport studies on CaFe2As2, using helium as the pressure medium. The signatures of the transitions to the low-temperature orthorhombic and collapsed tetragonal phases remained exceptionally sharp, and no signature of bulk superconductivity was found under our hydrostatic conditions. Our results suggest that superconductivity in CaFe2As2 is associated with a low-temperature, multicrystallographic-phase sample that is the result of nonhydrostatic conditions associated with the combination of a first-order structural phase transition and frozen liquid media.