Strong magnetoelastic effect on the magnetoelectric phenomena of   TbMn$_{2}$O$_{5}$
  Comparative studies of magnetoelectric susceptibility ($\alpha$), magnetization ($M$), and magnetostriction ($u$) in TbMn$_{2}$O$_{5}$ reveal that the increment of $M$ owing to the field-induced Tb$^{3+}$ spin alignment coins a field-asymmetric line shape in the $\alpha(H)$ curve, being conspicuous in a low temperature incommensurate phase but persistently subsisting in the entire ferroelectric phase. Correlations among electric polarization, $u$, and $M^{2}$ variation represent linear relationships, unambiguously showing the significant role of Tb magnetoelastic effects on the low field magnetoelectric phenomena of TbMn$_{2}$O$_{5}$. An effective free energy capturing the observed experimental features is also suggested. 
Yoon Seok Oh, Byung-Gu Jeon, S. Y. Haam, S. Park, V. F. Correa, A. H.   Lacerda, S.-W. Cheong, Gun Sang Jeon, and Kee Hoon Kim
cond-mat.str-el