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Dielectric properties of the low dimensional vanadium oxides Ba2V3O9 and Sr2V3O9

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http://pubman.mpdl.mpg.de/cone/persons/resource/persons126682

Kaul,  E. E.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons126614

Geibel,  C.
Christoph Geibel, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Bobnar, V., Lunkenheimer, P., Loidl, A., Kaul, E. E., & Geibel, C. (2002). Dielectric properties of the low dimensional vanadium oxides Ba2V3O9 and Sr2V3O9. Solid State Communications, 122(11), 595-599. doi:10.1016/S0038-1098(02)00220-X.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0015-31BF-D
Abstract
The dielectric response of the low-dimensional vanadium oxides Ba2V3O9 and Sr2V3O9 has been investigated in the frequency range of 20 Hz-1 MHz. At low frequencies the dielectric response is governed by strong relaxation-like features, which we attribute to Maxwell-Wagner type contact contributions. The analysis of the complex dielectric spectra in terms of an equivalent circuit revealed the intrinsic dielectric constant and dc conductivity of these systems. The frequency-dependent ac conductivity in both systems follows the universal dielectric response behaviour, clearly indicating that hopping of localised charge carriers is the dominating charge-transport process. Also, a newly observed dielectric relaxation process in both systems is reported and we find evidence for a phase transition close to 455 K in both materials. (C) 2002 Elsevier Science Ltd. All rights reserved.