Theory of the Metamagnetic Transition in FeCl2
作者:
R. P. Kenan,
R. E. Mills,
C. E. Campbell,
期刊:
Journal of Applied Physics
(AIP Available online 1969)
卷期:
Volume 40,
issue 3
页码: 1027-1028
ISSN:0021-8979
年代: 1969
DOI:10.1063/1.1657516
出版商: AIP
数据来源: AIP
摘要:
A crystal‐field calculation of the low‐lying levels of a Fe2+ion in FeCl2shows that the lowest lying levels, a doublet and a singlet, are well separated from the remaining levels. The relative isolation of these levels suggest taking the effective spin as unity. The Hamiltonian incorporates a Zeeman term, an exchange term between spinsS=1, and an anisotropy term. An RPA Green's function theory is derived, and, because of the highly anisotropic exchange, is reduced to an expansion about the molecular‐field theory, in powers of the non‐Ising exchange factors. It is found that even in MFT the metamagnetic‐transition field has temperature dependence which follows well that of the zero‐field sublattice magnetization.
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