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.
Mots clés
- electron spin resonance
- copper 63
- metal binding
- nuclear magnetic resonance
- optics
- prediction
- pressure measurement
- priority journal
- structure analysis
- theory
- Knight shift
- Relaxation time
- Spin gap
- Oxide superconductors
- conductance
- article
- unclassified drug
- strontium
- oxygen
- copper
- calcium
- Superconductivity
- Strontium compounds
- Single crystals
- Pressure
- Phase transitions
- Nuclear magnetic resonance
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