N. Kameda

Evidence for surface Andreev bound states in cuprate superconductors from penetration depth measurements.

Tunneling and theoretical studies have suggested that Andreev bound states form at certain surfaces of unconventional superconductors. Through studies of the temperature and field dependence of the in-plane magnetic penetration depth lambda(ab) at low temperature, we have found strong evidence for the presence of these states in clean single crystal YBCO and BSCCO. Crystals cut to expose (110) surfaces show a strong upturn in lambda(ab) at around 7 K, when the field is oriented along the c axis. In YBCO this upturn is completely suppressed by a field of approximately 0.1 T.

Campbell penetration depth of a superconductor in the critical state.

The magnetic penetration depth

High-resolution photoemission study of low-Tc superconductors: Phonon-induced electronic structures in low-Tc superconductors and comparison with the results of high-Tc cuprates

\ensuremath{\lambda}(T,H,j)

Josephson plasma resonance inBi2Sr2CaCu2O8+ywith spatially dependent interlayer phase coherence

was measured in the presence of a slowly relaxing supercurrent j. In single crystal

Josephson plasma resonance in Bi2Sr2CaCu2O8+y crystals with macroscopic inhomogeneities

{\mathrm{Bi}}_{2}{\mathrm{Sr}}_{2}{\mathrm{CaCu}}_{2}{\mathrm{O}}_{8}

Josephson plasma resonance in Bi2Sr2CaCu2O8+y with partially introduced columnar defects

below approximately 25 K,

Josephson plasma resonance in half-irradiated Bi2Sr2CaCu2O8+y

\ensuremath{\lambda}(T,H,j)

Vortex phase diagrams of Bi2Sr2CaCu2O8+y in tilted fields studied by a Hall probe

is strongly hysteretic. We propose that the irreversibility arises from a shift of the vortex position within its pinning well as j changes. The Campbell length depends upon the ratio

Macroscopic interference of interlayer phase coherence in Bi2Sr2CaCu2O8+y with inhomogeneous columnar defects

{j/j}_{c}

The crossing-lattices state in Bi2Sr2CaCu2O8+y

where