Abstract
The zero-field diamagnetic susceptibility and the paraconductivity of the mercury chain compound Hg3- delta AsF6 are calculated using the anisotropic Ginzburg-Landau theory with a model BCS hamiltonian with only inter-chain coupling. The coherence lengths are calculated from both the correlation function of Cooper pairs and the mean-field-type BCS hamiltonian with Cooper pairs hopping only in the c direction. The authors consider two limiting conditions: the 'superclean' limit, in which the correlation length in the c direction is given by xi c(0) approximately=h(cross) upsilon Fc/ pi Delta ; and the two-dimensional (2D) limit, in which weak scattering reduces xi c to approximately a lattice constant. In the 2D limit the susceptibility chi c for a field in the c direction, i.e. perpendicular to the chains, gives a Meissner effect of about 20% at T=2.72 Tc, where Tc=0.3 K, under a pressure of 10 kbar. This may partly account for the large Meissner effect observed in Hg3- delta AsF6 in the temperature range Tc-10T c. The paraconductivity is extremely small near Tc.
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