Neutron diffraction study of the structural and electronic properties of Sr2HoMn2O7 and Sr2YMn2O7

被引：38

作者：

Battle, PD

Millburn, JE

Rosseinsky, MJ

Spring, LE

Vente, JF

Radaelli, PG

机构：

[1] Univ Oxford, Inorgan Chem Lab, Oxford OX1 3QR, England

[2] Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France

来源：

CHEMISTRY OF MATERIALS | 1997年 / 9卷 / 12期

关键词：

D O I：

10.1021/cm970431p

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The crystal structures of Sr2HoMn2O7 and Sr2YMn2O7 have been determined at 290 and 1.7 K from neutron and X-ray powder diffraction data, Both are distorted Ruddlesden-Popper structures formed by the intergrowth of rock-salt-like layers and perovskite-like blocks of tilted MnO6 octahedra (space group P4(2)/mnm; for Ho at 290 K alpha = 5.40388(5), c = 19.9050(2) Angstrom). The majority of the lanthanide cations are located in the rock-salt layers, Neither structure changes significantly on cooling to 1.7 K. There is evidence for neither charge ordering of Mn3+ and Mn4+ cations nor for long-range magnetic ordering, The magnetic susceptibility maximum observed previously is thus confirmed as signifying a transition to a spin-glass phase, The behavior of these compounds is contrasted with that of other Mn oxides which show long-range magnetic order and colossal magnetoresistance.

引用

页码：3136 / 3143

页数：8

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