Dielectric anomaly at T_N in LaMnO3

Details Dielectric anomaly at T_N in LaMnO3 Dielectric anomaly at T_N in LaMnO3

2007-10-22

arxiv.org/abs/0710.3978v1

Phys. Rev. B 76, 172403 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

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

Scientific paper

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.

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