Magnetoelastic effects in terbium ferroborate

作者：Zvyagina G A^*; Zhekov K R; Bezmaternykh L N; Gudim I A; Bilych I V; Zvyagin A A

来源：Low Temperature Physics, 2008, 34(11): 901-908.

DOI：10.1063/1.3009584

• acoustic wave velocity
• antiferromagnetic materials
• elastic moduli
• exchange interactions (electron)
• iron compounds
• magnetoelastic effects
• solid-state phase transformations
• terbium compounds

The behavior of the elastic moduli and sound absorption in a terbium orthoborate single crystal at low temperatures is studied. The components of the tensor of the elastic moduli of this system are determined. A structural phase transition and a transition of the magnetic subsystem into an antiferromagnetically ordered state appear in the temperature dependences of the sound velocities and absorption. The magnetic field dependences of the velocities of transverse sound exhibit singularities in the form of jumps at a magnetic field equal to the field of the spin-flop transition of the antiferromagnetic subsystem. Theoretical analysis shows that the observed behavior of the acoustic characteristics are associated not with the rare-earth subsystem of ferroborate but rather with the renormalization of the exchange interaction between iron ions as a result of the magnetoelastic coupling.

• 出版日期2008-11