La{sub 1-x}Sr{sub x}CuO{sub 2.5} as a doped spin-ladder compound
- Kyoto Univ. (Japan)
The high-pressure synthesis, structural characterization, and physical properties of La{sub 1-x}Sr{sub x}CuO{sub 2.5} (0 {le} x {le} 0.20) are reported. The nondoped LaCuO{sub 2.5} prepared at high pressure of 6 GPa crystallizes in the CaMnO{sub 2.5} structure which is one of the prototypes of anion-deficient perovskites. The Rietveld analysis of the powder X-ray diffraction pattern remarkably shows a quasi-one-dimensional structure composed of Cu-O ladders. The magnetic susceptibility measurements suggest a spin liquid ground state with a large energy gap of 490 K as theoretically expected for a S = 1/2 Heisenberg antiferromagnetic ladder system. Systematic hole-doping is achieved by substituting Sr for La. A dramatic insulator-to-metal transition has been observed in the resistivity measurements on doping, but, with no signs of superconductivity as predicted theoretically for a lightly doped spin-ladder system.
- OSTI ID:
- 501788
- Journal Information:
- Journal of Solid State Chemistry, Vol. 123, Issue 2; Other Information: PBD: May 1996
- Country of Publication:
- United States
- Language:
- English
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