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Spin wave excitations in the pyrovanadate alpha-Cu2V2O7

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arxiv 1610.03969 v1 pith:B5MM6EAS submitted 2016-10-13 cond-mat.str-el

Spin wave excitations in the pyrovanadate alpha-Cu2V2O7

A. Banerjee , J. Sannigrahi , S. Bhowal , I. Dasgupta , S. Majumdar , H. C. Walker , A. Bhattacharyya , D. T. Adroja This is my paper
classification cond-mat.str-el
keywords alpha-cu2v2o7spinwavebelowdataexcitationsmagneticpyrovanadate
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The pyrovanadate alpha-Cu2V2O7 belongs to the orthorhombic (Fdd2) class of crystals with noncentrosymmetric crystal structure. Recently, the compound has been identified to be a magnetic multiferroic with a substantial electric polarization below the magnetic transition temperature TC = 35 K. Here we report the results of our inelastic neutron scattering (INS) studies on a polycrystalline sample of alpha-Cu2V2O7. Our INS data clearly show the existence of dispersive spin wave excitations below TC with a zone-boundary energy of 11 meV at 5 K.We have analyzed the data using linear spin wave theory, which shows good agreement between the experiment and calculation. The analysis is consistent with the third nearest neighbor exchange interaction playing a dominant role in the magnetism of the material.

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