The magnetic spin-reorientation transitions in the RGa (R = rare earth) intermetallic compounds studied by measurements of the hyperfine interactions of the 119Sn probe atoms

被引：39

作者：

Delyagin, N. N. ^{[1
]}

Krylov, V. I. ^{[1
]}

Rozantsev, I. N. ^{[1
]}

机构：

[1] Moscow MV Lomonosov State Univ, Inst Nucl Phys, Moscow 119992, Russia

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2007年 / 308卷 / 01期

关键词：

RGa intermetallic compounds; magnetic anisotropy; hyperfine interactions; Mossbauer spectroscopy;

D O I：

10.1016/j.jmmm.2006.05.004

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The magnetic and electric hyperfine interactions of the probe nucleus Sn-119 on the Ga site of the ferromagnetic rare-earth (R) gallium compounds RGa (R=Pr-Er) have been investigated by Mossbauer spectroscopy technique. For all of the compounds, the directions of the magnetic moments of the R 31 ions have been determined as a function of temperature in the range from 5K to T-C. For NdGa, SmGa, HoGa, and ErGa compounds, the magnetic reorientation transitions due to the competition between the exchange interaction and the interaction with crystal field have been investigated. At high temperatures, when the electric interaction dominates, the orientation of the magnetic moments is unambiguously determined by the sign of the quadrupole moment of 4f shell of the R3+ ion. With decreasing temperature, the magnetic moments rotate gradually from the bc-plane toward the crystallographic a-axis. In the temperature range 5K <= T < 100K, the ferromagnetic structure of the GdGa compound is noncollinear. At 5 K the magnetic moments of the Gd3+ ions point in two distinct directions with respect to the crystallographic a-axis (theta(1) approximate to 30 degrees and theta(2) approximate to 60 degrees). (c) 2006 Published by Elsevier B.V.

引用

页码：74 / 79

页数：6

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