Phenomenological model for the remanent magnetization of dilute quasi-one-dimensional antiferromagnets
Abstract
We present a phenomenological model for the remanent magnetization at low temperatures in the quasi-one-dimensional dilute antiferromagnets CH3NH3Mn1-xCdx Cl3· 2H2O and (CH3)2NH2Mn1-xCdxCl3· 2H2O. The model assumes the existence of uncompensated magnetic moments induced in the odd-sized segments generated along the Mn(2+) chains upon dilution. These moments are further assumed to correlate ferromagnetically after removal of a cooling field. Using a (mean-field) linear-chain approximation and reasonable set of model parameters, we are able to reproduce the approximate linear temperature dependence observed for the remanent magnetization in the real compounds.
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