TETRAHEDRALLY COORDINATED CR-5+ IN SRTIO3

被引：25

作者：

MULLER, KA ^{[1
]}

BLAZEY, KW ^{[1
]}

KOOL, TW ^{[1
]}

机构：

[1] UNIV AMSTERDAM,PHYS CHEM LAB,AMSTERDAM,NETHERLANDS

来源：

SOLID STATE COMMUNICATIONS | 1993年 / 85卷 / 05期

关键词：

D O I：

10.1016/0038-1098(93)90683-E

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

This paper reports on the electron paramagnetic resonance angular variation of the S = 1/2 Cr5+ center with orthorhombic symmetry, obtained after quenching Al and Cr-doped SrTiO3 from 1400-degrees-C. At 4.2 K, the main axes of the g-tensor in monodomain {001} samples are found to be along [001] and rotated by +/- alpha = 2 psi = 4-degrees from <110> axes, where psi is the intrinsic structural phase transition (SPT) order parameter. From this and the size of the g-values as well as stereometrical considerations, an assignment of the small Cr5+ ion to a tetrahedral site in the perovskite structure is made. Above the tetragonal-to-cubic SPT at T(c) = 105 K, a dynamic reorientation among the six equivalent sites is observed, and below T(c), a deviation from alpha(T) = 2 psi(T) between 70 K < T < T(c).

引用

页码：381 / 384

页数：4

共 22 条

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KOOPMANS WE, 1985, THESIS U AMSTERDAM

[12] ESR OF CR5+ IN CHROMIUM-DOPED SRTIO3 SINGLE-CRYSTALS [J].