Fizika Nizkikh Temperatur: Volume 43, Number 11 (November 2017), p. 1669-1675    ( to contents , go back )

(H,Ti) diagram of magnetic transformations induced by pulse magnetic field in antiferromagnetic LiCoPO4

V.M. Khrustalyov, V.M. Savytsky, and M.F. Kharchenko

B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Nauky Ave., Kharkiv 61103, Ukraine
E-mail: kharchenko@ilt.kharkov.ua, khrustalyov@ilt.kharkov.ua

Received Jule 19, 2017

Abstract

The differential magnetic susceptibility and electric polarization of an antiferromagnetic LiCoPO4 crystal in a pulsed magnetic field up to 290 kOe applied along the antiferromagnetism vector of the spin-ordering main mode (H||b) are studied in the range of initial sample temperatures from 1.6 to 20.8 K. An adiabatic (H,Ti) diagram of magnetic phase transitions is constructed. In addition to the three transitions found earlier at helium temperatures, at higher temperatures, features were revealed that indicate the existence of a first-order phase transition line in the high-field phase II, which ends with the critical point. The coordinates of the critical point are also determined, in which the lines of phase transitions bordering the region of existence of the high-field phase III converge with the line of phase transitions from phase II to the saturated paramagnetic phase.

PACS: 75.50.Ee Antiferromagnetic materials;
PACS: 75.30.Kz Magnetic phase transitions;
PACS: 75.60.Ej Magnetization of magnetic materials.

Key words: LiCoPO4, antiferromagnet, magnetic phase transitions, pulse magnetic field, magnetic phase diagram, magnetoelectric effect.

Published online:: September 25, 2017

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