Absence of spin gap in the superconducting ladder compound Sr_2Ca_{12}Cu_{24}O_{41}

Details Absence of spin gap in the superconducting ladder compound Sr_2Ca_{12}Cu_{24}O_{41} Absence of spin gap in the superconducting ladder compound Sr_2Ca_{12}Cu_{24}O_{41}

1997-10-07

arxiv.org/abs/cond-mat/9710063v1

Physics

Condensed Matter

6 pages, latex, 4 postscript figures included, submitted to Science

Scientific paper

10.1126/science.279.5349.345

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.

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