Absence of a spin gap in the superconducting ladder compound Sr2Ca12Cu24O41

被引:88
作者
Mayaffre, H
Auban-Senzier, P
Nardone, M
Jérome, D
Poilblanc, D
Bourbonnais, C
Ammerahl, U
Dhalenne, G
Revcolevschi, A
机构
[1] Univ Paris 11, Phys Solides Lab, CNRS, URA 002, F-91405 Orsay, France
[2] Univ Toulouse 3, Phys Quant Lab, CNRS, UMR 5626, F-31062 Toulon, France
[3] Univ Sherbrooke, Ctr Rech Phys Solide, Dept Phys, Sherbrooke, PQ J1K 2R1, Canada
[4] Univ Paris 11, Phys Solides Lab, CNRS, URA 446, F-91405 Orsay, France
[5] Univ Cologne, Inst Phys 2, D-50937 Cologne, Germany
关键词
D O I
10.1126/science.279.5349.345
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Transport and copper-63 nuclear magnetic resonance measurements of the Knight shift and relaxation time T-1 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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页码:345 / 348
页数:4
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