Structural and electrical properties under high pressure for the superconducting spin-ladder system Sr0.4Ca13.6Cu24O41+δ
M. Isobe, T. Ohta, M. Onoda, F. Izumi, S. Nakano, J. Q. Li, Y. Matsui, E. Takayama-Muromachi, T. Matsumoto, H. Hayakawa
DOI 10.1103/PhysRevB.57.613 · Physical Review B
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Abstract
We studied structural and electrical properties under high pressure and low temperature for a S=1/2 Heisenberg two-leg ladder compound Sr0.4Ca13.6Cu24O41+δ. It showed a superconducting transition above 3 GPa with a maximum Tc of 13 K. The Sr0.4Ca13.6Cu24O41+δ phase survives at least up to 9 GPa and down to 7 K without decomposition or phase transition, indicating that it is responsible for the observed superconductivity. The most important role of high pressure for realizing superconductivity is enhancement of the interaction between the Cu2O3 ladder and the one-dimensional CuO2 chain which accelerates redistribution of holes via locally formed Culadder−Ochain hybrid orbitals. Electrical property of the normal state is affected by the carrier density, dimensionality, random potential, and spin scattering which are related to structural modification under high pressure.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Sr0.4Ca13.6Cu24O41+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 13 | 3 GPa | unknown |
| Sr0.4Ca13.6Cu24O41.84 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 12 | 3 GPa | unknown |
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