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Strong anomalies of the thermal expansion coefficients at the magnetic andferroelectric transitions have been detected in multiferroic $RMn_2O_5$. Theircorrelation with anomalies of the specific heat and the dielectric constant isdiscussed. The results provide evidence for the magnetic origin of theferroelectricity mediated by strong spin-lattice coupling in the compounds.Neutron scattering data for $HoMn_2O_5$ indicate a spin reorientation at thetwo low-temperature phase transitions

physical review. b, condensed matter and materials physics

Structural anomalies at the magnetic and ferroelectric transitions in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>R</mml:mi><mml:msub><mml:mi mathvariant="normal">Mn</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>5</mml:mn></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mo>(</mml:mo><mml:mi>R</mml:mi><mml:mo>=</mml:mo><mml:mi …

Structural anomalies at the magnetic and ferroelectric transitions inRMn2O5(R=