https://doi.org/10.1140/epjb/e2008-00329-0
Infrared reflectivity spectra of η-Na1.3V2O5 in the charge disordered and ordered phase
1
Center for Solid State Physics and New Materials, Institute of Physics, Pregrevica 118, 11080 Belgrade, Serbia
2
Materials Design and Characterization Laboratory, Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
Corresponding author: a zoran.popovic@phy.bg.ac.yu
Received:
18
December
2007
Revised:
13
May
2008
Published online:
22
August
2008
We have measured the far-infrared reflectivity spectra of the sodium vanadium oxide η-Na1.3V2O5 polycrystals in the wide temperature (80–300 K) and frequency (150–1500 cm-1) range. Appearance of new phonon oscillators, phonon oscillator mode splitting and step-like shift of TO and LO frequencies at low temperatures are correlated with the charge-ordering phase transition, which takes place at about 120 K in this vanadium oxide.
PACS: 78.30.Hv – Other nonmetallic inorganics / 63.20.D- – Phonon states and bands, normal modes, and phonon dispersion / 71.30.+h – Metal-insulator transitions and other electronic transitions / 71.27.+a – Strongly correlated electron systems; heavy fermions
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2008
