Absence of spin gap in the superconducting ladder compound Sr_2Ca_{12}Cu_{24}O_{41}
Preprint
- 7 October 1997
Abstract
Transport and 63^Cu-NMR, Knight shift and T_1, measurements performed on the two-leg spin ladders of Sr_2Ca_{12}Cu_{24}O_{41} single crystals show a collapse of the gap in ladder spin excitations when superconductivity is stabilised under a pressure of 29 kbar. These results support the prediction made with exact diagonalisation techniques in two-leg isotropic t-J ladders of a transition between a low-doping spin gap phase and a gapless 1-D Tomonaga-Luttinger regime.Keywords
All Related Versions
- Version 1, 1997-10-07, ArXiv
- Published version: Science, 279 (5349), 345.
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