Spin wave excitations in the pyrovanadate α−Cu2V2O7
| Autor: | Indra Dasgupta, Helen Walker, Sayantika Bhowal, Amitava Bhattacharyya, D. T. Adroja, Subham Majumdar, J. Sannigrahi, Asok K. Banerjee |
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| Rok vydání: | 2016 |
| Předmět: |
Physics
Condensed matter physics Magnetism Exchange interaction 02 engineering and technology Crystal structure 021001 nanoscience & nanotechnology 01 natural sciences Polarization density Spin wave 0103 physical sciences Orthorhombic crystal system Multiferroics 010306 general physics 0210 nano-technology Energy (signal processing) |
| Zdroj: | Physical Review B. 94 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.94.144426 |
| Popis: | The pyrovanadate $\ensuremath{\alpha}\ensuremath{-}{\mathrm{Cu}}_{2}{\mathrm{V}}_{2}{\mathrm{O}}_{7}$ 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 ${T}_{C}$ = 35 K. Here we report the results of our inelastic neutron-scattering (INS) studies on a polycrystalline sample of $\ensuremath{\alpha}\ensuremath{-}{\mathrm{Cu}}_{2}{\mathrm{V}}_{2}{\mathrm{O}}_{7}$. Our INS data clearly show the existence of dispersive spin wave excitations below ${T}_{C}$ 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. |
| Databáze: | OpenAIRE |
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