Phenomenological model for the remanent magnetization of dilute quasi-one-dimensional antiferromagnets

Details Phenomenological model for the remanent magnetization of dilute quasi-one-dimensional antiferromagnets Phenomenological model for the remanent magnetization of dilute quasi-one-dimensional antiferromagnets

2002-04-18

arxiv.org/abs/cond-mat/0204390v2

Phys. Rev. B 66, 224411 (2002)

Physics

Condensed Matter

Statistical Mechanics

5 pages, 2 figures; final version to appear in Physical Review B

Scientific paper

10.1103/PhysRevB.66.224411

We present a phenomenological model for the remanent magnetization at low temperatures in the quasi-one-dimensional dilute antiferromagnets CH_{3}NH_{3}Mn_{1-x}Cd_{x} Cl_{3}\cdot 2H_{2}O and (CH_{3})_{2}NH_{2}Mn_{1-x}Cd_{x}Cl_{3}\cdot 2H_{2}O. 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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