A NEW DENSITY-OF-STATES IN HIGH-TC AND LOW TC SUPERCONDUCTORS

The new density of states applicable to high T(c) (HTS) and low T(c) ( LTS) superconductors is found to have two parts: a BCS (Bardeen Cooper Schrieffer) like form via a finite order parameter within the pairing interaction range, T(d) (Debye) and a new result q(w/T(d)=(2/pi) tan- 1 (w/T(d)) via a zero order parameter outside T(d). For large y=T(d)/p iT(c) (LTS), the q(w/T(d)) is small, and the BCS result is recovered. The q(w/T(d)) accounts for the low energy states observed in HTS and y ields the T(2) term in the quasiparticle density as well as the term T 2 in the specific heat at low T.