Magnetoelastic coupling in the organic radical β-p-NCC_{6}F_{4}CNSSN

Thomson, R. I and Wright, E. S. L. and Rawson, J. M. and Howard, C. J. and Carpenter, M. A. (2011) Magnetoelastic coupling in the organic radical β-p-NCC_{6}F_{4}CNSSN. Physical Review B, 84 (10). p. 104450. DOI 10.1103/PhysRevB.84.104450

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Abstract

Resonant ultrasound spectroscopy (RUS) was used to analyze the elastic and anelastic behavior associated with canted antiferromagnetic ordering at 36 K in the radical, β-p-NCC6F4CNSSN, 1. On cooling through the magnetic ordering transition there is anomalous elastic behavior away from the expected uniform stiffening with decreasing temperature, consistent with magnetoelastic coupling. The excess in the elastic stiffness follows the magnetic order parameter linearly below the magnetic ordering temperature. A much larger change in elastic properties is associated with short-range ordering between Tc and 150 K which appears to correlate with an excess heat capacity (and entropy). Thus it appears that the onset of long-range order to this spin canted system might only be a partial contribution to the whole phase transition.

Item Type: Article
Uncontrolled Keywords: 2011AREP; IA63;
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
Journal or Publication Title: Physical Review B
Volume: 84
Page Range: p. 104450
Identification Number: 10.1103/PhysRevB.84.104450
Depositing User: Sarah Humbert
Date Deposited: 18 Nov 2011 18:42
Last Modified: 23 Jul 2013 10:02
URI: http://eprints.esc.cam.ac.uk/id/eprint/2245

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