Competition between the singlet-spin liquid state and the magnetic ground state in a two-chain spin-1/2 antiferromagnetic ladder compound LaCuO{sub 2.5}: A {sup 63}Cu NMR study
- Department of Material Physics, Faculty of Engineering Science, Osaka University, Toyonaka, Osaka 560 (Japan)
- Institute for Chemical Research, Kyoto University, Uji, Kyoto-fu 611 (Japan)
The magnetic characteristics of LaCuO{sub 2.5} comprising an antiferromagnetic two-chain spin-1/2 ladder have been investigated by {sup 63}Cu NMR measurements. The ground state of this compound was suggested from susceptibility measurements to be the singlet-spin liquid state. The present experiments have, however, revealed that LaCuO{sub 2.5} is not in such a spin-liquid state, but rather a magnetic ordering takes place below {ital T}{sub {ital N}}{approximately} 110 K as evidenced by the large enhancement of the nuclear spin-lattice relaxation rate, (1/{ital T}{sub 1}) and of the spin-echo decay rate, 1/{ital T}{sub 2} leading to the disappearance of the Cu NMR signal. This magnetic ordered state has been found to be suppressed by substituting Sr for La by 5{percent}, i.e., by hole doping. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 283919
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 53, Issue 18; Other Information: PBD: May 1996
- Country of Publication:
- United States
- Language:
- English
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