Strong spin-lattice coupling in multiferroic HoMnO$_{3}$: Thermal expansion anomalies and pressure effect

Details Strong spin-lattice coupling in multiferroic HoMnO$_{3}$: Thermal expansion anomalies and pressure effect Strong spin-lattice coupling in multiferroic HoMnO$_{3}$: Thermal expansion anomalies and pressure effect

2005-01-25

arxiv.org/abs/cond-mat/0501615v1

Phys. Rev. B 71, 060407(R) (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevB.71.060407

Evidence for a strong spin-lattice coupling in multiferroic HoMnO_3 is derived from thermal expansion measurements along a- and c-axis. The magnetoelastic effect results in sizable anomalies of the thermal expansivities at the antiferromagnetic (T_N) and the spin rotation (T_{SR}) transition temperatures as well as in a negative c-axis expansivity below room temperature. The coupling between magnetic orders and dielectric properties below T_N is explained by the lattice strain induced by the magnetoelastic effect. At T_{SR} various physical quantities show discontinuities that are thermodynamically consistent with a first order phase transition.

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