Magnetic properties of tapiolite (FeTa₂O₆); a quasi two-dimensional (2D) antiferromagnet

Chung, E. M. L.; Lees, M. R.; McIntyre, G. J.; Wilkinson, C.; Balakrishnan, G.; Hague, J. P.; Visser, D. and Paul, D. McK. (2004). Magnetic properties of tapiolite (FeTa₂O₆); a quasi two-dimensional (2D) antiferromagnet. Journal of Physics: Condensed Matter, 16(43) pp. 7837–7852.

DOI: https://doi.org/10.1088/0953-8984/16/43/023

Abstract

The possibilities of two-dimensional (2D) short-range magnetic correlations and frustration effects in the mineral tapiolite are investigated using bulk-property measurements and neutron Laue diffraction. In this study of the magnetic properties of synthetic single-crystals of tapiolite, we find that single crystals of FeTa₂O₆ order antiferromagnetically at T_N = 7.95 ± 0.05 K, with extensive two-dimensional correlations existing up to at least 40 K. Although we find no evidence that FeTa₂O₆ is magnetically frustrated, hallmarks of two-dimensional magnetism observed in our single-crystal data include: (i) broadening of the susceptibility maximum due to short-range correlations, (ii) a spin-flop transition and (iii) lambda anomalies in the heat capacity and d(χT)/dT. Complementary neutron Laue diffraction measurements reveal 1D magnetic diffuse scattering extending along the c* direction perpendicular to the magnetic planes. This magnetic diffuse scattering, observed for the first time using the neutron Laue technique by VIVALDI, arises directly as a result of 2D short-range spin correlations.

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