Raman signatures of charge ordering in K0.3 WO3

Sagar DM, Fausti D, Van Smaalen S, Van Loosdrecht PHM (2010)

Publication Type: Journal article

Publication year: 2010

Journal

Physical Review B - Condensed Matter and Materials Physics American Physical Society (APS)

Book Volume: 81

Article Number: 045124

Journal Issue: 4

DOI: 10.1103/PhysRevB.81.045124

Abstract

We present polarization- and temperature-dependent Raman spectroscopic study of hexagonal tungsten bronze, K0.3 WO3. The observed asymmetry in phonon line shapes indicate the presence of strong lattice anharmonicity arising due to the nonstoichiometry of the material. We observed a broad multipeak Raman feature at low frequency due to the local modes of K atoms known as local structural excitations. The observed vibrational features indicate a second-order phase transition around T=200K accompanied by a frequency softening of low-frequency phonon modes. The observed phonon anomalies hint a physical picture involving a continuous symmetry change toward a charge-ordered state below 200 K. These observations indicate that K0.3 WO3 may exhibit a weak charge-density-wave ground state at low temperatures. © 2010 The American Physical Society.

Authors with CRIS profile

Daniele Fausti

Involved external institutions

University of Groningen / Rijksuniversiteit Groningen NL Netherlands (NL) Universität Bayreuth DE Germany (DE)

How to cite

APA:

Sagar, D.M., Fausti, D., Van Smaalen, S., & Van Loosdrecht, P.H.M. (2010). Raman signatures of charge ordering in K0.3 WO3. Physical Review B - Condensed Matter and Materials Physics, 81(4). https://dx.doi.org/10.1103/PhysRevB.81.045124

MLA:

Sagar, D. M., et al. "Raman signatures of charge ordering in K0.3 WO3." Physical Review B - Condensed Matter and Materials Physics 81.4 (2010).

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