Abstract
Experimental results of sound propagation in the spin reorientation region of TmFeO3 are presented. The velocity of a shear wave propagating along the c axis with a polarization in the a direction exhibits pronounced dips at the transition temperatures, Tl=84°K and Tu=93.6°K. A longitudinal wave in the c direction exhibits steplike velocity changes at the transition temperatures. The experimental results are explained by a relatively simple free-energy model, which includes in addition to the magnetic and elastic energy terms, a magnetoelastic coupling linear in the strain. An applied magnetic field in the a direction results in a shift of the lower transition at Tl and a suppression of the higher one. These effects are attributed to a Zeeman term and field-dependent coupling between the rare-earth and iron ions.
Original language | English |
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Pages (from-to) | 2051-2056 |
Number of pages | 6 |
Journal | Physical Review B |
Volume | 14 |
Issue number | 5 |
DOIs | |
State | Published - 1 Jan 1976 |
ASJC Scopus subject areas
- Condensed Matter Physics