Dielectric Properties of Charge-Ordered LuFe2O4 Revisited: The Apparent Influence of Contacts

Niermann, D.; de Groot, J.; Hemberger, J.; Waschkowski, F.; Angst, M.

doi:10.1103/PhysRevLett.109.016405

Journal Article

PreJuSER-22298

Dielectric Properties of Charge-Ordered LuFe2O4 Revisited: The Apparent Influence of Contacts

Niermann, D. ; Waschkowski, F. ; de Groot, J.FZJ* ; Angst, M.FZJ* ; Hemberger, J.

2012
APS College Park, Md.

Physical review letters 109, 016405 (2012) [10.1103/PhysRevLett.109.016405]

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Please use a persistent id in citations: http://hdl.handle.net/2128/7523 doi:10.1103/PhysRevLett.109.016405

Abstract: We show results of broadband dielectric measurements on the charge ordered, proposed to be multiferroic material LuFe2O4. The temperature and frequency dependence of the complex permittivity as investigated for temperatures above and below the charge-order transition near T-CO approximate to 320 K and for frequencies up to 1 GHz can be well described by a standard equivalent-circuit model considering Maxwell-Wagner-type contacts and hopping induced ac conductivity. No pronounced contribution of intrinsic dipolar polarization could be found, and thus the ferroelectric character of the charge order in LuFe2O4 has to be questioned.

Keyword(s): J

Classification:

Physics, Multidisciplinary

Note: This work has been funded by the DFG through SFB608 (Cologne). Support from the initiative and networking fund of Helmholtz Association by funding the Helmholtz University Young Investigator Group "Complex Ordering Phenomena in Multifunctional Oxides" is gratefully acknowledged. M. A. thanks D. Mandrus, B. C. Sales, W. Tian and R. Jin for their assistance during sample synthesis, supported by US DOE.

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Appears in the scientific report 2012

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Medline