Abstract The dielectric constant of an incipient ferroelectric EuTiO3 exhibits a sharp decrease at about 5.5K, at which the antiferromagnetic ordering of the Eu spins simultaneously appears. This fact indicates the existence of a coupling between the magnetism and dielectric properties of EuTiO3. We propose a possible coupling mechanism between the magnetic and electrical subsystems as $-g\sum_l\sum_{\langle i,j \rangle}q_l^2\vec{S}_i\cdot\vec{S}_j$. In the framework of soft-mode theory, we have obtained analytically a dielectric constant expression related to the spin correlation of nearest neighbours of Eu ions.
Received: 30 May 2002
Revised: 18 August 2002
Accepted manuscript online:
PACS:
77.84.-s
(Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials)
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