Structural and electrical properties under high pressure for the superconducting spin-ladder system Sr{sub 0.4}Ca{sub 13.6}Cu{sub 24}O{sub 41+{delta}}
- National Institute for Research in Inorganic Materials (NIRIM), 1-1 Namiki, Tsukuba, Ibaraki 305 (Japan)
- National Research Institute for Metals (NRIM), 1-2-1 Sengen, Tsukuba, Ibaraki 305 (Japan)
- National Institute of Materials and Chemical Research (NIMC), 1-1 Higashi, Tsukuba, Ibaraki 305 (Japan)
We studied structural and electrical properties under high pressure and low temperature for a S=1/2 Heisenberg two-leg ladder compound Sr{sub 0.4}Ca{sub 13.6}Cu{sub 24}O{sub 41+{delta}}. It showed a superconducting transition above 3 GPa with a maximum T{sub c} of 13 K. The Sr{sub 0.4}Ca{sub 13.6}Cu{sub 24}O{sub 41+{delta}} 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 Cu{sub 2}O{sub 3} ladder and the one-dimensional CuO{sub 2} chain which accelerates redistribution of holes via locally formed Cu{sub ladder}-O{sub chain} 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. {copyright} {ital 1998} {ital The American Physical Society}
- OSTI ID:
- 573804
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 57, Issue 1; Other Information: PBD: Jan 1998
- Country of Publication:
- United States
- Language:
- English
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