Berlin 2005 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

TT: Tiefe Temperaturen

TT 31: Correlated Electrons - Low-dimensional Materials I

TT 31.5: Vortrag

Dienstag, 8. März 2005, 15:00–15:15, TU H2053

Strong evidence for Luttinger Liquid behaviour in quasi-one-dimensional Lithium purple bronze — •J. Hager and R. Matzdorf — FB 18, Universität Kassel, Heinrich-Plett-Str. 40, 34132 Kassel

We have measured the density of states at energies near the Fermi energy є_F using scanning tunneling spectroscopy on cleaved Li_0.9Mo₆O₁₇ samples. In literature the discussion about the electronic structure, especially a phase transition at T=24K remains controversial. Localization effects, charge density wave and spin density wave transitions, as well as a Luttinger Liquid scenario are used to explain experiments. Our dI/dV measurements at 5K show strong depression of the dI/dV signal at є_F. Our experimental spectra near the Fermi energy can be explained excellently by Luttinger Liquid theory at low and ambient temperatures. Our data excludes current zero bias anomaly theories for explanation, which would predict a similar behaviour.