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A Powder Neutron Diffraction Study of the Magnetic Structure of FeV2S4

✍ Scribed by Anthony V Powell; Clemens Ritter; Paz Vaqueiro

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
307 KB
Volume
144
Category
Article
ISSN
0022-4596

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✦ Synopsis

Variable-temperature powder neutron di4raction data demonstrate that FeV 2 S 4 undergoes a transition to a long-range magnetically ordered state at 135(7) K, in agreement with magnetic susceptibility data. High-resolution neutron di4raction data collected at 1.9 K reveal that magnetic ordering results in a doubling of the crystallographic unit-cell dimensions (I2/m a ‫؍‬ 5.8302(2), b ‫؍‬ 3.2761(1), c ‫؍‬ 11.2398(4) A s , ‫؍‬ 92.046(2)3) in the a and c directions and that the magnetic structure is described by a propagation vector of ( 1 2 , 0, 1 2 ). Cations in an ordered defect layer, 76% of which are Fe(II), possess an average ordered moment of 1.86(5) B , which is directed at an angle of 753 to the layer. Cation+cation interactions reduce the average moment of cations in the MS 2 unit to 0.17(4) B . The complex magnetic structure involves essentially collinear antiferromagnetic ordering between nearest-neighbor cations.

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