Instability of the Co-magnetic moment in Tm(Co,M)2 (M=Al,Si) / Baranov N.V., Bartashevich M.I., Goto T., Yermakov A.A., Karkin A.E., Pirogov A.N., Teplykh A.E. // Journal of Alloys and Compounds. - 1997. - V. 252, l. 1-2. - P. 32-40.

ISSN:

09258388

Type:

Article

Abstract:

Tm(Co1-xAlx)2 compounds with x=0; 0.05; 0.10 and Tm(Co0.95Si0.05)2 have been studied by means of ac-susceptibility, magnetization, magnetostriction, electrical resistivity and neutron diffraction measurements. It is shown that the magnetic state of TmCo2 is characterized by the absence of the Co-magnetic moment and by the presence of the localized spin density fluctuations in the d-subsystem at low temperatures and is strongly affected by an applied magnetic field. The partial substitution of Al or Si for Co in TmCo2 leads to the appearance of the long range magnetic order and gives rise to the Co-magnetic moment up to MCo = 1.25 μB. In Tm(Co0.9Al0.1)2, the field-induced phase transition in d-subsystem was observed at the critical field Bc ≈ 17 T using high-field magnetization and magnetostriction measurements. This phase transition is associated with a collapse of the Co-magnetic moment. Instability of the Co-magnetic moment in TmCo2 at the substitution and in an applied magnetic field is explained by the closeness of the molecular field acting on the Co-subsystem to the critical value of the Co metamagnetic transition field.

Author keywords:

Index keywords:

Cobalt; Electric conductivity; Magnetic field effects; Magnetic moments; Magnetic permeability; Magnetization; Magnetostriction; Neutron diffraction; Phase transitions; Composition effects; Electric c

DOI:

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Affiliations	Inst. of Phys. and Appl. Mathematics, Ural State University, 620083 Ekaterinburg, Russian Federation; Institute for Solid State Physics, University of Tokyo, Roppongi, Minato-ku, Tokyo 106, Japan; Institute for Metal Physics, Russian Academy of Sciences, 620219 Ekaterinburg, Russian Federation
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Correspondence Address	Baranov, N.V.; Inst. of Phys. and Appl. Mathematics, Ural State University, 620083 Ekaterinburg, Russian Federation; email: baranov@ipham.urgu.e-burg.su
CODEN	JALCE
Language of Original Document	English
Abbreviated Source Title	J Alloys Compd
Source	Scopus