Superconductivity of the Sr2Ca12Cu24O41 Spin-Ladder System: Are the Superconducting Pairing and the Spin-Gap Formation of the Same Origin?
Naoki Fujiwara, Nobuo Môri, Yoshiya Uwatoko, Takehiko Matsumoto, Naoki Motoyama, Shinichi Uchida
DOI 10.1103/PhysRevLett.90.137001 · Physical Review Letters
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Abstract
Pressure-induced superconductivity in a spin-ladder cuprate Sr2Ca12Cu24O41 has not been studied on a microscopic level thus far although the superconductivity was already discovered in 1996. We have improved the high-pressure technique using a large high-quality crystal, and succeeded in studying the superconductivity using Cu63 nuclear magnetic resonance. We found that the anomalous metallic state reflecting the spin-ladder structure is realized and the superconductivity possesses an s-wave-like character in the meaning that a finite gap exists in the quasiparticle excitation: At a pressure of 3.5 GPa, we observed two excitation modes in the normal state from the relaxation rate T1−1. One gives rise to an activation-type component in T1−1, and the other T-linear component linking directly with the superconductivity. This gapless mode likely arises from free motion of holon-spinon bound states appearing by hole doping, and the pairing of them likely causes the superconductivity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Sr2Ca12Cu24O41 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.8 | 3.5 GPa | onset |
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