The magnetic phase transitions in R(Co, Al) 2 compounds (R: Dy, Ho, Er)

The type of the magnetic phase transition in the R(Co 1- x Al x ) 2 (R=Dy, Ho, Er) compounds is studied by means of magnetization, thermal-expansion and electrical-resistivity measurements. With increasing Al content, a change from a first-order to a second-order transition is observed, at x≃0.075,...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 1992-03, Vol.176 (3), p.232-238
Main Authors: Duc, N.H., Hien, T.D., Levitin, R.Z., Markosyan, A.S., Brommer, P.E., Franse, J.J.M.
Format: Article
Language:English
Subjects:
Applied sciences
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.)
Magnetic properties and materials
Magnetically ordered materials: other intrinsic properties
Metals. Metallurgy
Physics
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Summary:The type of the magnetic phase transition in the R(Co 1- x Al x ) 2 (R=Dy, Ho, Er) compounds is studied by means of magnetization, thermal-expansion and electrical-resistivity measurements. With increasing Al content, a change from a first-order to a second-order transition is observed, at x≃0.075, 0.075 and 0.025 for Er, Ho and Dy, respectively. An explanation is offered in terms of the Inoue-Shimizu model by introducing a concentration dependence of T 3, the temperature at which a 3( T) changes sign ( a 3 is the coefficient of the M 4 d -term in the expansion of the free energy of the d-subsystem). In fact, T 3 is taken proportional to T m, the temperature at which the susceptibility of the corresponding Y(Co, Al) 2 shows a maximum.
ISSN:0921-4526
1873-2135
DOI:10.1016/0921-4526(92)90011-G