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Magnetic phase diagram of three-dimensional diluted Ising antiferromagnet NiMg(OH)
- diagram of 3D diluted Ising antiferromagnet
NiMg(OH) with = 0.8 has been determined from
measurements of SQUID DC magnetization and AC magnetic susceptibility. At =
0, this compound undergoes two magnetic phase transitions: an antiferromagnetic
(AF) transition at the N\'{e}el temperature (= 20.7 K) and a reentrant
spin glass (RSG) transition at ( 6 K). The - diagram
consists of the RSG, spin glass (SG), and AF phases. These phases meet a
multicritical point ( = 42 kOe, = 5.6 K). The
irreversibility of susceptibility defined by (= ) shows a negative local minimum for 10 35 kOe,
suggesting the existence of possible glassy phase in the AF phase. A broad peak
in and at 20 kOe for (= 26.4 K) suggests the existence of the Griffiths
phase.Comment: 11 pages, 14 figures; J. Phys. Soc. Jpn. 73 (2004) No. 1 issue, in
pres