Magnetodielectric coupling by exchange striction in Y2Cu2O5 |
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Authors: | U. Adem G. Nénert Arramel N. Mufti G. R. Blake T. T.M. Palstra |
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Affiliation: | 1.Zernike Institute for Advanced Materials, University of Groningen,Groningen,The Netherlands;2.CEA-Grenoble INAC/SPSMS/MDN,Grenoble Cedex 9,France;3.Institut Laue-Langevin,Grenoble Cedex 9,France |
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Abstract: | We have studied the magnetodielectric response of Y2Cu2O5, the so-called blue phase in the Y2O3-CuO-BaO phase diagram. Based on symmetry principles, we predict and demonstrate magneto-dielectric coupling on a single crystal sample. We report an anomaly in the dielectric constant at the ordering temperature of the Cu spins. We probe the magnetic field-induced phase transitions between four different magnetic phases using magneto-capacitance measurements, demonstrating relatively strong magnetodielectric coupling. We observe an increase in dielectric constant in the spin-flip phase where there exists spontaneous magnetization. We construct a detailed magnetic phase diagram. The magnetodielectric coupling is analyzed in terms of striction induced by symmetric superexchange and optical phonon frequency shifts. |
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