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Evidence of soft modes in magnetoelectric CuFeO2: Ultrasonic velocity measurements and Landau theory
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Quirion, G., Tagore, M. J., Plumer, M. L. and Petrenko, O. A.. (2008) Evidence of soft modes in magnetoelectric CuFeO2: Ultrasonic velocity measurements and Landau theory. Physical Review B (Condensed Matter and Materials Physics), Vol.77 (No.9). Article No. 094111. ISSN 1098-0121
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Official URL: http://dx.doi.org/10.1103/PhysRevB.77.094111
Abstract
Ultrasonic velocity measurements are used to examine the elastic properties of the magnetoelectric compound CuFeO2 in the vicinity of the magnetic and structural phase transitions near 14 K. Strong softening of modes related to C-66 occurs at the transition from the high- temperature rhombohedral R (3) over barm to lower-temperature monoclinic C2/ m symmetry. A Landau free energy is proposed and analyzed in order to understand the elastic properties of CuFeO2. The principal features of sound velocity modes vs temperature are reproduced by the model. Our analysis suggests that the transition at 14 K is primary pseudoproper ferroelastic, with the spin acting as a secondary order parameter.
| Item Type: | Journal Article |
|---|---|
| Subjects: | Q Science > QC Physics |
| Divisions: | Faculty of Science > Physics |
| Journal or Publication Title: | Physical Review B (Condensed Matter and Materials Physics) |
| Publisher: | American Physical Society |
| ISSN: | 1098-0121 |
| Date: | March 2008 |
| Volume: | Vol.77 |
| Number: | No.9 |
| Number of Pages: | 7 |
| Page Range: | Article No. 094111 |
| Identification Number: | 10.1103/PhysRevB.77.094111 |
| Status: | Peer Reviewed |
| Publication Status: | Published |
| Access rights to Published version: | Restricted or Subscription Access |
| URI: | http://wrap.warwick.ac.uk/id/eprint/30289 |
Data sourced from Thomson Reuters' Web of Knowledge
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