Ferromagnetism and Lattice Distortions in the Perovskite YTiO$_3$

Simple item page
dc.creatorKnafo, W.
dc.creatorMeingast, C.
dc.creatorLöhneysen, H. v.
dc.creatorBoris, A. V.
dc.creatorPopovich, P.
dc.creatorKovaleva, N. N.
dc.creatorYordanov, P.
dc.creatorMaljuk, A.
dc.creatorKremer, R. K.
dc.creatorKeimer, B.
dc.date2008-12-08
dc.date.accessioned2026-07-07T12:52:08Z
dc.date.available2026-07-07T12:52:08Z
dc.descriptionThe thermodynamic properties of the ferromagnetic perovskite YTiO$_3$ are investigated by thermal expansion, magnetostriction, specific heat, and magnetization measurements. The low-temperature spin-wave contribution to the specific heat, as well as an Arrott plot of the magnetization in the vicinity of the Curie temperature $T_C\simeq27$ K, are consistent with a three-dimensional Heisenberg model of ferromagnetism. However, a magnetic contribution to the thermal expansion persists well above $T_C$, which contrasts with typical three-dimensional Heisenberg ferromagnets, as shown by a comparison with the corresponding model system EuS. The pressure dependences of $T_C$ and of the spontaneous moment $M_s$ are extracted using thermodynamic relationships. They indicate that ferromagnetism is strengthened by uniaxial pressures $\mathbf{p}\parallel \mathbf{a}$ and is weakened by uniaxial pressures $\mathbf{p}\parallel \mathbf{b},\mathbf{c}$ and hydrostatic pressure. Our results show that the distortion along the $a$- and $b$-axes is further increased by the magnetic transition, confirming that ferromagnetism is favored by a large GdFeO$_3$-type distortion. The c-axis results however do not fit into this simple picture, which may be explained by an additional magnetoelastic effect, possibly related to a Jahn-Teller distortion.
dc.description12 pages, 13 figures
dc.identifierhttps://arxiv.org/abs/0812.1533
dc.identifierhttp://arxiv.org/abs/0812.1533
dc.identifierPhys. Rev. B 79, 054431 (2009).
dc.identifierdoi:10.1103/PhysRevB.79.054431
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/223207
dc.subjectStrongly Correlated Electrons
dc.titleFerromagnetism and Lattice Distortions in the Perovskite YTiO$_3$
dc.typetext

Files

Collections

arXiv