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dimensional crossover; critical fields; transport properties; tunneling phenomena
Abstract:
The three-dimensional to two-dimensional (2D) crossover of the
superconducting state is presented for the naturally layered
single crystal of (LaSe)(1.14)(NbSe2) with the critical
temperature T-c of 1.23 K. Namely, the temperature dependence
of the upper critical magnetic field B-c2 parallel to the
layers reveals an upturn at the crossover temperature T* due to
the vortex confinement between the superconducting layers.
Below this temperature in the 2D regime the angular dependence
of B-c2 displays a cusp at the field parallel to the layers. In
the superconducting state the interlayer transport is
accomplished in this system by the tunneling of quasiparticles
and Cooper pairs. (C) 2001 Published by Elsevier Science B.V.
