Oxygen ordering and phase separation in La2CuO4+δ
Journal
Physical Review B
Journal Volume
52
Journal Issue
21
Pages
15575-15581
Date Issued
1995
Author(s)
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. © 1995 The American Physical Society.
Type
journal article