Dielectric anomaly at T_N in LaMnO3

Abstract

We observe a distinct anomaly in dielectric permittivity (epsilon') as well as relaxation time (tao_0) versus temperature (T) pattern at the antiferromagnetic transition point (T_N) in single crystal of LaMnO3. The equivalent circuit analysis of the impedance spectra across T_N reveals clear anomaly in the capacitive component C_0 at T_N. Since no structural transition takes place across T_N, the anomaly in tao_0 and C_0 at T_N possibly signifies multiferroicity stemming from coupling between orbital and spin order in LaMnO3.

14 pages including 3 figures; pdf only; accepted for publication in Phys. Rev. B

References in corpus (4)

• Ferroelectricity in spiral magnets
• Magnetodielectric effect without multiferroic coupling
• Resonant x-ray scattering study on multiferroic BiMnO3
• Dielectric anomaly at the orbital order-disorder transition in LaMnO_(3+delta)

Cited by in corpus (3)

• Disproportionation and electronic phase separation in parent manganite LaMnO_3
• Local polarization in oxygen-deficient LaMnO${}_3$ induced by charge localization in the Jahn-Teller distorted structure
• Imaging and Control of Ferromagnetism in a Polar Antiferromagnet