Abstract
Pressure effects on the superconductors Pn (Pn = P and As) with the two-dimensional anti-post-perovskite structure were investigated. It was found that with increasing pressure, the superconducting transition temperature () decreases with a negative differential pressure () coefficient /dP = −0.19 and −0.013 K/GPa for Pn = P and As, respectively. This is in marked contrast to the positive differential pressure coefficients reported for other vanadium-based superconductors with a three-dimensional crystal structure. The observed change in under pressure is revealed to be closely correlated with the evolution of the normal-state resistivity. The results support the phonon-mediated superconductivity in Pn.
- Received 14 March 2014
- Revised 11 April 2014
DOI:https://doi.org/10.1103/PhysRevB.89.144510
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