Structural anomalies at the magnetic and ferroelectric transitions in R Mn 2 O 5 ( R = <mml:mi …
2006; American Physical Society; Volume: 73; Issue: 10 Linguagem: Inglês
10.1103/physrevb.73.100406
ISSN1550-235X
AutoresClarina dela Cruz, Fei Yen, B. Lorenz, M. Gospodinov, C. W. Chu, William Ratcliff, J. W. Lynn, S. Park, S.-W. Cheong,
Tópico(s)Ferroelectric and Piezoelectric Materials
ResumoStrong anomalies of the thermal expansion coefficients at the magnetic and ferroelectric transitions have been detected in multiferroic $R{\mathrm{Mn}}_{2}{\mathrm{O}}_{5}$. Their correlation with anomalies of the specific heat and the dielectric constant is discussed. The results provide evidence for the magnetic origin of the ferroelectricity mediated by strong spin-lattice coupling in the compounds. Neutron scattering data for $\mathrm{Ho}{\mathrm{Mn}}_{2}{\mathrm{O}}_{5}$ indicate a spin reorientation at the two low-temperature phase transitions.
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