Random-field and glassy dynamics in a diluted Ising antiferromagnet:

A. Rosales-Rivera; J. M. Ferreira; F. C. Montenegro

doi:10.1209/epl/i2000-00264-2

Issue		Europhys. Lett. Volume 50, Number 2, April II 2000


Page(s)		264 - 270
Section		Condensed matter: electronic structure, electrical, magnetic, and optical properties
DOI		https://doi.org/10.1209/epl/i2000-00264-2
Published online		01 September 2002

Europhys. Lett., 50 (2), pp. 264-270 (2000)

Random-field and glassy dynamics in a diluted Ising antiferromagnet: $Mathematical equation: $\textmd{Fe}_{0.42}\textmd{Zn}_{0.58}\textmd{F}_2$$

A. Rosales-Rivera¹, J. M. Ferreira² and F. C. Montenegro²

¹ Departamento de Física, Universidad Nacional de Colombia A.A. 127, Manizales, Colombia
² Departamento de Física, Universidade Federal de Pernambuco 50670-901, Recife, PE, Brasil

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Received: 29 November 1999
Accepted: 10 February 2000

Abstract

The random-field Ising model (RFIM) system $Mathematical equation: $\ab{Fe}_{0.42}\ab{Zn}_{0.58}\ab{F}_2$$ is studied by magnetization and dynamic susceptibility measurements, under finite dc applied fields (H). For $Mathematical equation: $H < 20\un{kOe}$$ , the magnetic behaviour is compatible with a long-range ordered (LRO) antiferromagnetic (AF) ground state, which undergoes a phase transition (PT) at a critical temperature $Mathematical equation: $T_\ab{c}(H)$$ . For higher H, the LRO configuration becomes unstable and the PT is destroyed. A glassy dynamics emerges in the upper part of the (H,T) phase diagram. Our results reconcile earlier concepts associated with the weak RFIM problem with recent experimental data in $Mathematical equation: $\ab{Fe}_x\ab{Zn}_{1-x}\ab{F}_2$$ .

PACS: 75.50.Lk – Spin glasses and other random magnets / 75.40.Gb – Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.) / 75.30.Kz – Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.)

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