The dielectric constant of quantum paraelectric (formula presented) which contains (formula presented) with (formula presented) spin and (formula presented) has been measured under a magnetic field. The dielectric constant shows a critical decrease at the antiferromagnetic ordering of the Eu spins at 5.5 K, as well as a substantial change under a magnetic field (by (formula presented) with 1.5 T), indicating a strong coupling between the Eu spins and dielectric properties. We show that the variation of the dielectric constant is dominated by the pair correlation of the nearest-neighbor Eu spins, likely via the variation of the soft-phonon-mode frequency.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2001 Jan 1|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics