Anomalous Magnetic Anisotropy of Caged Cubic Compound SmRu sub( 2)Zn sub( 20)

The magnetic susceptibility X, magnetization M, and specific heat C were measured for the caged cubic compound SmRu2Zn20 at temperatures down to 2 K in a magnetic field H along the three principal axes of [111], [101], and [001]. A ferromagnetic phase transition was observed at TC = 7.8 K in the tem...

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Bibliographic Details
Published in:Journal of the Physical Society of Japan 2014-07, Vol.83 (7), p.1-1
Main Authors: Isikawa, Yosikazu, Mizushima, Toshio, Ejiri, Jun-ichi, Kuwai, Tomohiko
Format: Article
Language:English
Subjects:
Crystal structure
Ground state
Lattice parameters
Magnetic anisotropy
Magnetic fields
Magnetic permeability
Magnetization
Zeeman effect
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Summary:The magnetic susceptibility X, magnetization M, and specific heat C were measured for the caged cubic compound SmRu2Zn20 at temperatures down to 2 K in a magnetic field H along the three principal axes of [111], [101], and [001]. A ferromagnetic phase transition was observed at TC = 7.8 K in the temperature dependences of both X(T) and C(T). The Sm ion in SmRu2Zn20 is trivalent, which is shown by the experimental results of the lattice constant and X(T) between 10 and 300 K. The easy axis of magnetization is the [111] direction, and the entropy at TC is R ln 4, indicating that the ground state is quartet. These experimental results, however, contradict the simple prediction based on the cubic crystalline electric field (CEF) of Sm3+. If the ground state is quartet Gamma 8, the easy axis of magnetization should be in the [001] direction. We analyzed the anomalous magnetic anisotropy by taking into account quadrupole-quadrupole and octupole-octupole interactions as well as the cubic CEF effect, the usual exchange interaction, and the Zeeman effect.
ISSN:0031-9015
1347-4073