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APS » Journals » Phys. Rev. Lett. » Volume 91 » Issue 25
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Phys. Rev. Lett. 91, 257208 (2003) [4 pages]

Magnetodielectric Effects from Spin Fluctuations in Isostructural Ferromagnetic and Antiferromagnetic Systems

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G. Lawes1, A. P. Ramirez1,2, C. M. Varma2, and M. A. Subramanian3
1Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
2Bell Laboratories, Lucent Technologies, 600 Mountain Avenue, Murray Hill, New Jersey 07974, USA
3DuPont Central Research and Development, Experimental Station, Wilmington, Delaware 19880, USA

Received 16 May 2003; published 18 December 2003

We report on the effects of spin fluctuations, magnetic ordering, and external magnetic field on the dielectric constant of the ferromagnet SeCuO3, and the antiferromagnet TeCuO3. A model based on the coupling between uniform polarization and the q-dependent spin-spin correlation function is presented to explain the different behaviors for these isostructural compounds. The large magnetocapacitance near the transition temperature in the ferromagnet SeCuO3 suggests routes to enhancing the magnetodielectric response for practical applications.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.91.257208
DOI:
10.1103/PhysRevLett.91.257208
PACS:
75.80.+q, 75.30.–m, 75.50.Dd
 
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