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Magnetodielectric and magnetoelastic coupling in TbFe3(BO3)4

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arxiv 1007.3291 v1 pith:LMNQXW5V submitted 2010-07-19 cond-mat.mtrl-sci

Umut Adem , Liran Wang , Daniele Fausti , Wolf Schottenhamel , Paul H.M. van Loosdrecht , Alexander Vasiliev , Leonard N. Bezmaternykh , Bernd Büchner
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Christian Hess Rüdiger Klingeler
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classification cond-mat.mtrl-sci
keywords couplingmagneticmagnetodielectricdielectricmagnetoelastictbfe3accordingassociated
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We have studied the magnetodielectric and magnetoelastic coupling in TbFe3(BO3)4 single crystals by means of capacitance, magnetostriction and Raman spectroscopy measurements. The data reveal strong magnetic field effects on the dielectric constant and on the macroscopic sample length which are associated to long range magnetic ordering and a field-driven metamagnetic transition. We discuss the coupling of the dielectric, structural, and magnetic order parameters and attribute the origin of the magnetodielectric coupling to phonon mode shifts according to the Lyddane-Sachs-Teller (LST) relation.

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