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U. Adem G. Nénert Arramel N. Mufti G. R. Blake T. T.M. Palstra 《The European Physical Journal B - Condensed Matter and Complex Systems》2009,71(3):393-399
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. 相似文献
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