Oxygen ordering and phase separation in La2CuO4+delta

被引：64

作者：

Statt, BW

Hammel, PC

Fisk, Z

Cheong, SW

Chou, FC

Johnston, DC

Schirber, JE

机构：

[1] AT&T BELL LABS,MURRAY HILL,NJ 07974

[2] IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011

[3] SANDIA NATL LABS,ALBUQUERQUE,NM 87185

[4] UNIV TORONTO,DEPT PHYS,TORONTO,ON M5S 1A7,CANADA

来源：

PHYSICAL REVIEW B | 1995年 / 52卷 / 21期

关键词：

D O I：

10.1103/PhysRevB.52.15575

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present a detailed NMR study of the expected A and anomalous B Cu lines on a single crystal of La2CuO4+delta 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.

引用

页码：15575 / 15581

页数：7

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