Magnetodielectric coupling by exchange striction in Y2Cu2O5

U. Adem*, G. Nenert, [No Value] Arramel, N. Mufti, G. R. Blake, T. T. M. Palstra

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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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.

Original languageEnglish
Pages (from-to)393-399
Number of pages7
JournalEuropean Physical Journal B
Volume71
Issue number3
DOIs
Publication statusPublished - Oct-2009

Keywords

  • FERROELECTRIC POLARIZATION
  • DIELECTRIC-CONSTANT
  • NEUTRON-DIFFRACTION
  • MAGNETIC-STRUCTURES
  • SINGLE-CRYSTALS
  • BAMNF4
  • TRANSITIONS
  • BEHAVIOR
  • OXIDES
  • RAMAN

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