Masatsugu Suzuki et al 2000 J. Phys.: Condens. Matter 12 1377 doi:10.1088/0953-8984/12/7/320
Spin-glass phase and re-entrant spin-glass phase in diluted three-dimensional Ising antiferromagnet NicMg1-c(OH)2
Masatsugu Suzuki
, Itsuko S Suzuki and Toshiaki Enoki
The magnetic phase diagram of a diluted three-dimensional Ising antiferromagnet NicMg1-c(OH)2 is determined. It consists of a spin-glass phase for 0.1 < c < 0.5, a re-entrant spin-glass phase for 0.5 ≤ c ≤ 0.8 and an antiferromagnetic phase for 0.5 ≤ c ≤ 1. The dynamic aspect of the spin-glass phase and the re-entrant spin-glass phase is studied from the temperature, frequency and field dependence of dispersion χ´ and χ´´. The relaxation time for c = 0.25 and 0.8 diverges in accordance with a critical slowing down with a dynamic critical exponent x = 8.79 ± 2.44 for c = 0.25 and 10.1 ± 1.3 for c = 0.8. The re-entrant spin-glass phase at c = 0.5 and 0.6 may be a mixed phase of spin-glass phase and antiferromagnetic phase. The competition between ferromagnetic intraplanar and antiferromagnetic interplanar exchange interaction gives rise to spin-glass behaviour.
- PACS
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75.30.Kz Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.)
- Subjects
- Dates
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Issue 7 (21 February 2000)
Received 19 October 1999
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Spin-glass phase and re-entrant spin-glass phase in diluted three-dimensional Ising antiferromagnet NicMg1-c(OH)2
Masatsugu Suzuki et al 2000 J. Phys.: Condens. Matter 12 1377
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