UNSPECIFIED. (2004) Magnetic properties of tapiolite (FeTa(2)0(6)); a quasi two-dimensional (2D) antiferromagnet. JOURNAL OF PHYSICS-CONDENSED MATTER, 16 (43). pp. 7837-7852. ISSN 0953-8984

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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(chiT)/dT. Complementary neutron Laue diffraction measurements reveal ID 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.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Journal or Publication Title:	JOURNAL OF PHYSICS-CONDENSED MATTER
Publisher:	IOP PUBLISHING LTD
ISSN:	0953-8984
Official Date:	3 November 2004
Dates:	Date Event 3 November 2004 UNSPECIFIED
Volume:	16
Number:	43
Number of Pages:	16
Page Range:	pp. 7837-7852
Identification Number:	10.1088/0953-8984/16/43/023
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/7744

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