Strong magnetoelastic effect on the magnetoelectric phenomena of TbMn$_{2}$O$_{5}$

Details Strong magnetoelastic effect on the magnetoelectric phenomena of TbMn$_{2}$O$_{5}$ Strong magnetoelastic effect on the magnetoelectric phenomena of TbMn$_{2}$O$_{5}$

2011-01-07

arxiv.org/abs/1101.1353v1

Phys. Rev. B 83, 060405(R) (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 4 figures. Accepted in Physical Review B Rapid Communication

Scientific paper

10.1103/PhysRevB.83.060405

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.

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