Abstract
The lower critical field has been carefully measured on a well-shaped cylindrical dense sample of the new superconductor fabricated by high-pressure synthesis. The penetration depth is calculated from the data. It is found that a linear relation of appears in the whole temperature region below Furthermore, a finite slope of and remains down to the lowest temperature (2 K). These are inconsistent with the expectation for an isotropic s-wave superconductivity in
- Received 13 April 2001
DOI:https://doi.org/10.1103/PhysRevB.64.094522
©2001 American Physical Society