Article Dans Une Revue Science Année : 1998

Absence of a spin gap in the superconducting ladder compound Sr2Ca12Cu24O41

Résumé

Transport and copper-63 nuclear magnetic resonance measurements of the Knight shift and relaxation time T1 performed on the two-leg spin ladders of Sr2Ca12Cu24O41 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.; Transport and copper-63 nuclear magnetic resonance measurements of the Knight shift and relaxation time T1 performed on the two-leg spin ladders of Sr2Ca12Cu24O41 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.

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hal-04944315 , version 1 (05-03-2025)

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H. Mayaffre, P. Auban-Senzier, M. Nardone, D. Jérome, D. Poilblanc, et al.. Absence of a spin gap in the superconducting ladder compound Sr2Ca12Cu24O41. Science, 1998, 279 (5349), pp.345-348. ⟨10.1126/science.279.5349.345⟩. ⟨hal-04944315⟩
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