Magnetostatic critical-point phenomena of Fe

Autor:	Kazuo Miyatani, Toshiro Tanaka
Rok vydání:	1997
Předmět:	Physics Curie–Weiss law Ferromagnetism Condensed matter physics Heisenberg model Critical point (thermodynamics) General Physics and Astronomy Curie temperature Ising model Spontaneous magnetization Magnetic susceptibility
Zdroj:	Journal of Applied Physics. 82:5658-5661
ISSN:	1089-7550 0021-8979
DOI:	10.1063/1.366427
Popis:	The magnetostatic critical-point phenomena of a highly pure polycrystalline Fe sphere (99.999% pure) have been first investigated by a vibrating sample magnetometer for the applied field from 0 to 8 kOe. The kink point locus was observed for the whole critical region. The critical temperature, the spontaneous magnetization, and the zero-field susceptibility were determined without data extrapolations. The Curie temperature and the critical indices were obtained to be: Tc=1042.98±0.02 K, β=0.352±0.005 for e=4×10−5–6×10−3, γ=1.269±0.005 for e=2×10−4–2×10−2, and δ=4.20±0.05. γ neither agrees with the 3d Ising model nor with the 3d Heisenberg model, and β fits between the two models. These indices satisfy the Griffith’s inequality, γ′⩾β(δ−1). The critical equation of state was given by the same form as that for Ni.
Databáze:	OpenAIRE
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