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

C. Dela Cruz, F. Yen, B. Lorenz, Y. Q. Wang, Y. Y. Sun, M. M. Gospodinov, C. W. Chu

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101 Citations (Scopus)

Abstract

Evidence for a strong spin-lattice coupling in multiferroic HoMnO 3 is derived from thermal expansion measurements along the a and c axes. 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.

Original languageEnglish
Article number060407
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume71
Issue number6
DOIs
Publication statusPublished - 2005 Feb

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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