Abstract
Magnetization measurements under hydrostatic pressure up to 8 kbar in the pyrochlore superconductor ( at ) were carried out. A positive pressure effect on with was observed, whereas no pressure effect on the magnetic penetration depth was detected. The pressure independent ratio ( is the superconducting gap at zero temperature) was found to be close to the BCS value 3.52. Magnetization and muon-spin rotation measurements of indicate that is an adiabatic -wave BCS-type superconductor. The value of extrapolated to zero temperature and ambient pressure was estimated to be 230(30) nm.
- Received 22 April 2004
DOI:https://doi.org/10.1103/PhysRevLett.93.157004
©2004 American Physical Society