1999/05/26 by K. Jonason, Jonason, K., P. Nordblad +4
Chemistry · Materials Science · Physics and Astronomy · #Condensed Matter (cond-mat) #FOS: Physical sciences #Inorganic Fluorides and Related Compounds #Magnetism in coordination complexes #Theoretical and Computational Physics #cond-mat
paper · pdf · doi:10.48550/arxiv.cond-mat/9905384
arxiv created 1999/05/26 · openalex publication_date 1999/05/26 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The diluted Ising antiferromagnet, Fe0.31Zn0.69F2, has been investigated by dynamic susceptibility measurements in zero and and finite applied dc-fields. In zero field, there is a para- to antiferromagnetic phase transition at TN ≈ 20.0 K, followed by a dramatic slowing down of the dynamics at low temperatures. The latter described by a pure Arrhenius law. The effect of a superposed dc-field on the antiferromagnetic phase transition and on the low-temperature dynamics is investigated, and a comprehensive static and dynamic phase diagram in the H-T plane is derived. In agreement with earlier results on the same system, TN(H) follows a random-exchange Ising model to random-field Ising model crossover scaling for fields H ≤ 1.5 T. A random-field induced glassy dynamics appears for higher values of H, where the antiferromagnetic phase transition is destroyed. The low-temperature dynamics shows striking similarities with the behavior observed in reentrant antiferromagnets.