Magnetic structure and exchange integral measurement in TlMnF3

Madhav Rao, L. ; Satya Murthy, N. S. (1971) Magnetic structure and exchange integral measurement in TlMnF3 Journal de Physique. Colloques, 32 . C1-617-C1-618. ISSN 0449-1947

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Neutron diffraction patterns of polycrystalline TlMnF3 from 300°K to 4.2°K indicate that it has a cubic perovskite structure (a0 = 4.248 Å) which undergoes an antiferromagnetic transition below 76.5°K to a structure of the G-type without any crystallographic distortion. The magnetic moment of the Mn2+ ion in this compound is 4.90 μB at 42°K. The dominant exchange interaction among the magnetic ions in TIMnF3 which form a simple cubic lattice is a σ-type superexchange among the nearest neighbors. Under this assumption, the exchange integral has been evaluated by paramagnetic neutron scattering using the moments method of de Gennes. J is found to be 3° ± 0.3°K which is in very good agreement with theoretical calculations.

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Deposited On:30 Mar 2011 10:26
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