ELECTRIC-FIELD EFFECTS IN THE EPR OF TETRAHEDRALLY COORDINATED CR5+ IN SRTIO3

被引:15
作者
KOOL, TW
DEJONG, HJ
GLASBEEK, M
机构
[1] Lab. for Phys. Chem., Amsterdam Univ.
关键词
D O I
10.1088/0953-8984/6/8/015
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
This paper reports on electron paramagnetic resonance experiments of tetrahedrally coordinated Cr5+ in SrTiO3, under the influence of applied static electric fields. At 77 K, the applied electric fields induce an alignment of the off-centre Cr5+ ions along the direction of the electric field. The alignment is caused by a linear coupling of the electric dipole moment associated with the off-centred Cr5+ ion within the octahedron of surrounding O2- ions and the applied static electric field. From the measurements an electric dipole moment of mu = 2.88 x 10(-30) C m and an off-centre displacement of about 0.04 angstrom could be determined. Previous results of stress experiments for the Cr5+:SrTiO3 system, at 77 K, have also been considered; for Cr5+ under stress an elastic dipole model is inferred. A differential stress coupling coefficient beta[110BAR] = 4.19 x 10(-24) cm-3 has been determined.
引用
收藏
页码:1571 / 1576
页数:6
相关论文
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