DPG Phi
Verhandlungen
Verhandlungen
DPG

Dresden 2006 – scientific programme

Parts | Days | Selection | Search | Downloads | Help

TT: Tiefe Temperaturen

TT 7: Superconductivity & Solids At Low Temperature - Poster Session

TT 7.35: Poster

Monday, March 27, 2006, 14:00–17:45, P1

Pressure-induced changes in the quasi-one-dimensional superconductor β-Na0.33V2O5 studied by Raman spectroscopy — •S. Frank1, C. A. Kuntscher1, I. Gregora2, T. Yamauchi3, and Y. Ueda311.Physikalisches Institut, Universität Stuttgart, D-70550 Stuttgart, Germany — 2Institute of Physics ASCR, Praha, Czech Republic — 3Institute for Solid State Physics, University of Tokyo, Tokyo

β-Na0.33V2O5 is one of the first known inorganic quasi-one-dimensional superconductors. The pressure - temperature phase diagram is remarkable, showing a superconducting phase for pressures higher than 7 GPa in direct vicinity to a charge-ordered phase. The mechanism of the superconductivity and its relation to the charge ordering is not clear.

In a recent infrared study under pressure major changes in the reflectivity spectra were observed above 12 GPa, in particular the appearance of additional, relatively broad excitations [1]. A redistribution of charge with a possible relation to structural changes was suggested as a possible explanation. To obtain a deeper understanding of the changes occurring at 12 GPa we carried out polarization-dependent Raman spectroscopy under pressure at room temperature. The results are discussed in terms of a possible structural phase transition at 12 GPa.

Supported by the DFG, Emmy Noether-program.

[1] C.A. Kuntscher et al., Phys. Rev. B 71, 220502(R) (2005)

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2006 > Dresden