LOW-TEMPERATURE SUPERFLUID RESPONSE OF HIGH-T-C SUPERCONDUCTORS

Citation
T. Xiang et al., LOW-TEMPERATURE SUPERFLUID RESPONSE OF HIGH-T-C SUPERCONDUCTORS, International journal of modern physics b, 12(10), 1998, pp. 1007-1032
Citations number
45
Categorie Soggetti
Physics, Condensed Matter","Physycs, Mathematical","Physics, Applied
ISSN journal
02179792
Volume
12
Issue
10
Year of publication
1998
Pages
1007 - 1032
Database
ISI
SICI code
0217-9792(1998)12:10<1007:LSROHS>2.0.ZU;2-Y
Abstract
We have reviewed our theoretical and experimental results of the low t emperature superfluid response function rho(s)(mu) of high temperature superconductors (HTSC). In clean high-T-c materials the in-plane supe rfluid density rho(s)(ab) varies linearly with temperature. The slope of this linear T term is found to scale approximately with 1/T-c which , according to the weak coupling BCS theory for a d-wave superconducto r, implies that the gap amplitude scales approximately with T-c. A T-5 behavior of the out-of-plane superfluid density rho(s)(c) for clean t etragonal HTSC was predicted and observed experimentally in the single layer Hg-compound HgBa2CuO4+delta. In other tetragonal high-T-c compo unds with relatively high anisotropy, such as Hg2Ba2Ca2Cu3O8-delta, rh o(s)(c) varies as T-2 due to disorder effects. In optimally doped YBa2 Cu3O7-delta, rho(s)(c) varies linearly with temperature at low tempera tures, but in underdoped YBa2Cu3O7-delta, rho(s)(c) varies as T-2 at l ow temperatures; these results are consistent with our theoretical cal culations.