Effect of mechanical stresses on the magnetoelastic properties of TmVO4 |
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Authors: | Z A Kazei |
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Institution: | (1) M. V. Lomonosov State University at Moscow, 119899 Moscow, Russia |
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Abstract: | In this paper the influence of mechanical stress on magnetoelastic properties, i.e., magnetostriction and thermal expansion
in the neighborhood of a structural phase transition of the Jahn-Teller crystal TmVO4 is investigated experimentally and theoretically. It is shown that the magnetoelastic properties of TmVO4 for a magnetic field H∥001] do not change the domain structure of the sample, which is rather well described when mechanical stresses in the crystal
are taken into account using the parameter
. Conversely, for magnetic fields along the direction of spontaneous strain 110] the magnetoelastic properties are primarily
caused by reorientation of the Jahn-Teller domains and short-range order effects. It is shown that the “true” magnetostriction
of a single-domain crystal for H∥110] diverges at the phase transition point T
c=2.15 K in the absence of mechanical stresses and is strongly decreased by these stresses.
Fiz. Tverd. Tela (St. Petersburg) 40, 701–705 (April 1998) |
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Keywords: | |
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