OXYGEN ORDERING AND PHASE-SEPARATION IN LA2CUO4+DELTA

Citation
Bw. Statt et al., OXYGEN ORDERING AND PHASE-SEPARATION IN LA2CUO4+DELTA, Physical review. B, Condensed matter, 52(21), 1995, pp. 15575-15581
Citations number
31
Categorie Soggetti
Physics, Condensed Matter
ISSN journal
01631829
Volume
52
Issue
21
Year of publication
1995
Pages
15575 - 15581
Database
ISI
SICI code
0163-1829(1995)52:21<15575:OOAPIL>2.0.ZU;2-P
Abstract
We present a detailed NMR study of the expected A and anomalous B Cu l ines on a single crystal of La2CuO4+delta Our results in conjunction w ith those of neutron scattering and La NMR lead us to conclude that ox ygen ordering occurs on a microscopic scale in this compound. The orde red interstitial oxygen gives rise to a distribution of tilts of the C uO6 octahedra in the B domains. A sawtooth modulation of the octahedra l tilt, in which the sign of the tilt changes when the tilt reaches a maximum value, is deduced. In addition we show that macroscopic phase separation is inhibited in the tetragonal phase where the CuO6 octahed ra are not tilted.