Oxygen ordering and phase separation in La2CuO4+δ

B. W. Statt, P. C. Hammel, Z. Fisk, S. W. Cheong, F. C. Chou, D. C. Johnston, J. E. Schirber

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Abstract

We present a detailed NMR study of the expected A and anomalous B Cu lines on a single crystal of La2CuO4+δ. Our results in conjunction with those of neutron scattering and La NMR lead us to conclude that oxygen ordering occurs on a microscopic scale in this compound. The ordered interstitial oxygen gives rise to a distribution of tilts of the CuO6 octahedra in the B domains. A sawtooth modulation of the octahedral 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 octahedra are not tilted.

Original languageEnglish (US)
Pages (from-to)15575-15581
Number of pages7
JournalPhysical Review B
Volume52
Issue number21
DOIs
StatePublished - 1995

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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