NMR and NQR study of pressure-induced superconductivity and the origin of critical-temperature enhancement in the spin-ladder cuprate Sr2Ca12Cu24O41
N. Fujiwara, Y. Fujimaki, S. Uchida, K. Matsubayashi, T. Matsumoto, Y. Uwatoko
DOI 10.1103/PhysRevB.80.100503 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
Pressure-induced superconductivity was studied for a spin-ladder cuprate Sr2Ca12Cu24O41 using nuclear magnetic resonance under pressures up to the optimal pressure 3.8 GPa. Pressure application leads to a transitional change from a spin-gapped state to a Fermi-liquid state at temperatures higher than Tc. The relaxation rate 1/T1 shows activated-type behavior at an onset pressure, whereas Korringa-like behavior becomes predominant at the optimal pressure, suggesting that an increase in the density of states at the Fermi energy leads to enhancement of Tc. Nuclear quadrupole resonance spectra suggest that pressure application causes transfer of holes from the chain to the ladder sites. The transfer of holes increases DOS below the optimal pressure. A dome-shaped Tc versus pressure curve arises from naive balance between the transfer of holes and broadening of the band width.
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. | — | 3.8 GPa | unknown |
| Sr2Ca12Cu24O41 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | 3.5 GPa | unknown |
| Sr14-xCaxCu24O41 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
Similar papers
Superconductivity in a single-layer alkali-doped FeSe: A weakly coupled two-leg ladder system
similarity 0.95Wei Li et al.
Source status unknown — claims are unverified
Competing superconducting instabilities in the one-dimensional p-band degenerate cold fermionic system
similarity 0.94V. Bois et al.
Source status unknown — claims are unverified
Resonant magnetic mode in superconducting two-leg ladders
similarity 0.94D. Poilblanc et al.
Source status unknown — claims are unverified
Coexistence of long-range magnetic ordering and singlet ground state in the spin-ladder superconductor SrCa13Cu24O41
similarity 0.94Guochu Deng et al.
Source status unknown — claims are unverified
NMR and NQR study of pressure-induced superconductivity and the origin of critical-temperature enhancement in the spin-ladder cuprate SrCaCuO
similarity 0.93N. Fujiwara et al. · 2009 · arXiv:0908.2845
Source status unknown — claims are unverified
Structural and electrical properties under high pressure for the superconducting spin-ladder system Sr0.4Ca13.6Cu24O41+δ
similarity 0.93M. Isobe et al.
Source status unknown — claims are unverified