Abstract
A persistent kink in the pressure dependence of the “hidden order” (HO) transition temperature of is observed at a critical pressure for . In , the kink at is accompanied by the destruction of superconductivity, a change in the magnitude of a spin excitation gap, determined from electrical resistivity measurements; and a complete gapping of a portion of the Fermi surface (FS), inferred from a change in scattering and the competition between the HO state and superconductivity for FS fraction.
- Received 17 July 2007
DOI:https://doi.org/10.1103/PhysRevLett.99.217207
©2007 American Physical Society