Abstract
single crystals under uniaxial pressure applied along the 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 found below 10 K in samples subjected to nonhydrostatic pressure conditions.
- Received 25 March 2010
DOI:https://doi.org/10.1103/PhysRevB.81.180506
©2010 American Physical Society