Spin Gap and Superconductivity in the Interlayer Pair Tunneling Model
Abstract
A simple interlayer pair tunneling is solved exactly. We find that in the normal state spin1/2 particle and hole excitations are gapped. But the state is an unusual metal, characterized by novel fermionic spin zero and charge +2e and 2e excitations that exist about their own Fermi surfaces. The model is consistent with a number of properties of the underdoped cuprates. At finite temperature the Fermi surface appears partially gapped, and at high temperatures the spin gap disappears completely. Superconductivity is induced by an additional intralyer interaction which opens a gap in the chargefermion spectrum. The symmetry of this charge gap (and hence that of the order parameter) is igenerally different from the symmetry of oneelectron or  hole gap. The former can be a d wave, while the latter is more complex.
 Publication:

arXiv eprints
 Pub Date:
 April 1997
 DOI:
 10.48550/arXiv.condmat/9704123
 arXiv:
 arXiv:condmat/9704123
 Bibcode:
 1997cond.mat..4123S
 Keywords:

 Condensed Matter
 EPrint:
 Latex file 10 pages. 5 postscript figs. (ssarker@ua1vm.ua.edu)