Absence of a spin gap in the superconducting ladder compound Sr{sub 2}Ca{sub 12}Cu{sub 24}O{sub 41}
- Universite Paris-Sud, Orsay (France); and others
Transport and copper-63 nuclear magnetic resonance measurements of the Knight shift and relaxation time T{sub 1} performed on the two-leg spin ladders of Sr{sub 2}Ca{sub 12}Cu{sub 24}O{sub 41} single crystals as a function of pressure show a collapse of the gap in ladder spin excitations when superconductivity is stabilized at 31 kilobars. This result suggests that the superconducting phase in these materials may be connected to this transition and the collapse of the spin gap, and support the prediction made with exact diagonalization techniques in two-leg isotropic t - J ladder models of a transition between a low-doping spin gap phase and a gapless regime.
- OSTI ID:
- 576836
- Journal Information:
- Science, Journal Name: Science Journal Issue: 5349 Vol. 279; ISSN SCIEAS; ISSN 0036-8075
- Country of Publication:
- United States
- Language:
- English
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