Abstract
The magnetic penetration depth in the vortex state of has been measured as a function of temperature T and magnetic field H applied along the c-|Ax axis. The internal field distribution in single crystals was fit assuming a triangular vortex lattice with an average in-plane penetration depth =(=1155(3) Å, extrapolated to T=0 and H=0; λ(H,T) increases with both T and H. The large T-independent increase in with H is attributed to a strong nonlinear response as a result of the unconventional pairing in the superconducting state.
- Received 19 December 1996
DOI:https://doi.org/10.1103/PhysRevB.55.11789
©1997 American Physical Society