Structural study of pressure-induced magnetic phase transitions in manganites La0.67Ca0.33MnO3 and Pr0.7Ca0.3MnO3

被引：21
作者：
Kozlenko, DP [1 ]
Glazkov, VP
Sadykov, RA
Savenko, BN
Voronin, VI
Medvedeva, IV
机构：
[1] Joint Inst Nucl Res, Frank Lab Neutron Phys, Dubna 141980, Moscow Region, Russia
[2] Kurashov Inst, Russian Res Ctr, Moscow 123182, Russia
[3] Russian Acad Sci, Inst High Pressure Phys, Troitsk 142190, Moscow Region, Russia
[4] Russian Acad Sci, Ural Div, Inst Phys Met, Ekaterinburg 620219, Russia
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2003年 / 258卷
关键词：
crystal and magnetic structure; high pressure; neutron diffraction;
D O I：
10.1016/S0304-8853(02)01111-3
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A crystal and magnetic structure of manganites La0.67Ca0.33MnO3 and Pr0.7Ca0.3MnO3 has been studied by means of powder neutron diffraction at pressures up to 5 GPa in the temperature range 15-300 K. Under high pressure, an appearance of A-type antiferromagnetic state in both systems was observed. Both compounds exhibit anisotropic compression of the lattice which leads to the apical compression of MnO6 octahedra. Calculated from obtained structural data, pressure dependence of the charge-carrier bandwidth is in a qualitative agreement with observed pressure behavior of insulator-metal transition temperature within the framework of the double-exchange model. (C) 2002 Elsevier Science B.V. All rights reserved.
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收藏
页码：290 / 292
页数：3
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