Magnetoelastic effects in rare-earth vanadates YbVO4 and HoVO4

Autor:	Z. A. Kazei, R. I. Chanieva
Rok vydání:	2006
Předmět:	Tetragonal crystal system symbols.namesake Materials science Condensed matter physics Solid-state physics Quadrupole Isotropy symbols General Physics and Astronomy Vanadate Young's modulus Softening Thermal expansion
Zdroj:	Journal of Experimental and Theoretical Physics. 102:266-276
ISSN:	1090-6509 1063-7761
DOI:	10.1134/s1063776106020087
Popis:	Magnetoelastic anomalies in the thermal expansion and Young modulus, as well as the ΔE-effect in rare-earth vanadates RVO4 (R = Ho, Yb), are investigated experimentally and theoretically. A considerable softening of the Young modulus is observed for HoVO4 and YbVO4 at T < 70 K and T < 150 K, respectively; this effect is adequately described in the framework of the generalized susceptibility formalism. It is shown that the field dependences of the ΔE-effect and their temperature variation in YbVO4 can also be described using this approach. To compare with experiment, the magnetoelastic contributions to the Young modulus of an isotropic polycrystal from various elastic modes have been averaged. For the Yb vanadate, considerable magnetoelastic anomalies in the thermal expansion along the tetragonal a and c axes have been discovered. The magnetoelastic contributions are used for determining completely symmetric magnetoelastic coefficients; the role of the completely symmetric quadrupole constant for magnetoelastic effects is analyzed.
Databáze:	OpenAIRE
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