Uniaxial Quadrupole Order in a Magnet with Strong Biquadratic Exchange

It is shown that the temperature transition from a disordered paramagnetic state to the ground ferromagnetic state in a magnet with sufficiently strong biquadratic exchange interaction (compared to bilinear exchange) and spin S > 1 passes through an intermediate magnetically ordered phase (uniaxi...

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Bibliographic Details
Published inPhysics of metals and metallography Vol. 124; no. 12; pp. 1216 - 1223
Main Authors Kokorina, E. E., Medvedev, M. V.
Format Journal Article
LanguageEnglish
Published Moscow Pleiades Publishing 01.12.2023
Springer Nature B.V
Subjects
Chemistry and Materials Science
Electrical and Magnetic Properties
Exchanging
Ferromagnetism
Magnetic permeability
Materials Science
Metallic Materials
Phase diagrams
Phase transitions
Quadrupoles
biquadratic exchange
initial magnetic susceptibility
uniaxial quadrupole ordering
magnetic heat capacity
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Summary:It is shown that the temperature transition from a disordered paramagnetic state to the ground ferromagnetic state in a magnet with sufficiently strong biquadratic exchange interaction (compared to bilinear exchange) and spin S > 1 passes through an intermediate magnetically ordered phase (uniaxial quadrupole ordering). For a magnet with spin S = 3/2, a phase diagram of magnetic states in the region of large values of the biquadratic exchange is constructed in the mean-field approximation and the influence of the sequence of two phase transitions (paramagnetic state−quadrupole state and quadrupole state–ferromagnetic state) on the temperature behavior of the magnetic heat capacity and the initial magnetic susceptibility is investigated.
ISSN:0031-918X
1555-6190
DOI:10.1134/S0031918X23602299