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

A. Revcolevschi; C. Bourbonnais; D. J\'erome; D. Poilblanc; G. Dhalenne; H. Mayaffre; P. Auban-Senzier; U. Ammerahl

arxiv: cond-mat/9710063 · v1 · submitted 1997-10-07 · ❄️ cond-mat

Absence of spin gap in the superconducting ladder compound Sr₂Ca₁₂Cu₂₄O₄₁

H. Mayaffre , P. Auban-Senzier , D. J\'erome , D. Poilblanc , C. Bourbonnais , U. Ammerahl , G. Dhalenne , A. Revcolevschi This is my paper

classification ❄️ cond-mat

keywords spinladderladderstwo-legabsencecollapsecompoundcrystals

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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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Absence of spin gap in the superconducting ladder compound Sr₂Ca₁₂Cu₂₄O₄₁

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