INCOMMENSURATE MAGNETIC CORRELATIONS IN LA2NIO4.125 - MAGNETIC PHASE-DIAGRAM AND 2-DIMENSIONAL HOLE-ORDER

被引：44

作者：

YAMADA, K ^{[1
]}

OMATA, T ^{[1
]}

NAKAJIMA, K ^{[1
]}

ENDOH, Y ^{[1
]}

HOSOYA, S ^{[1
]}

机构：

[1] TOHOKU UNIV,INST MAT RES,AOBA KU,SENDAI,MIYAGI 980,JAPAN

来源：

PHYSICA C | 1994年 / 221卷 / 3-4期

关键词：

D O I：

10.1016/0921-4534(94)90242-9

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The magnetic phase diagram of La2NiO4+delta is studied by magnetization and neutron scattering measurements. Three-dimensional (3D) magnetic order with an incommensurate Ni2+ spin modulation in the NiO2 plane appears beyond oxygen doping delta around 0.10. The sharpness of the magnetic phase transition in this phase dramatically depends on delta and the sharpest one is observed at delta almost-equal-to 0.125 = 1/8. In contrast to the carrier doping with delta < 0.10, which degradates the 3D commensurate magnetic order, the Neel temperature (T(N)) of this phase is raised by the increase of oxygen doping. Above T(N) two-dimensional (2D) incommensurate fluctuations dominate. The magnetic phase diagram and the commensurate-incommensurate phase transition of this system are discussed based on the 2D hole-order in the NiO2 plane.

引用

页码：355 / 362

页数：8

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