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Chinese Physics, 2002, Vol. 11(12): 1303-1306    DOI: 10.1088/1009-1963/11/12/316
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

A possible coupling mechanism between magnetism and dielectric properties in EuTiO3

Jiang Qing (蒋青), Wu Hua (吴华)
Department of Physics, Suzhou University, Suzhou 215006, China
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.
Keywords:  coupling mechanism      magnetism      dielectric property      soft-mode theory  
Received:  30 May 2002      Revised:  18 August 2002      Accepted manuscript online: 
PACS:  77.84.-s (Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials)  
  77.22.Ch (Permittivity (dielectric function))  
  75.50.Ee (Antiferromagnetics)  
  75.10.Dg (Crystal-field theory and spin Hamiltonians)  

Cite this article: 

Jiang Qing (蒋青), Wu Hua (吴华) A possible coupling mechanism between magnetism and dielectric properties in EuTiO3 2002 Chinese Physics 11 1303

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