Luttinger-Liquid signature in scanning tunneling spectra of Li0.9Mo6O17

ORAL

Abstract

We present low-temperature scanning tunneling spectroscopy data from the quasi one-dimensional purple bronze Li$_{0.9}$Mo$_{6}$O$_{17}$. Our spectra show clearly a power-law behavior in density of states around Fermi-energy (-50meV $<$ E $<$ +50meV) with an exponent of $\alpha $ = 0.6 . Temperature dependent spectra between T = 5K and 50K are well-described using a model that involves tunneling into a Luttinger-Liquid at finite temperature. We do not observe any signature in the density of states near T = 24K where a insulator-to-metal transition has been reported. Finally we will discuss our data within the model of a zero bias anomaly (ZBA). However, this model does not describe the experimental data as well as the Luttinger-model does. (Oak Ridge national Laboratory, managed by UT-Battelle, LLC, for the U.S. Dept. of Energy under contract DE-AC05-00OR22725)

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Authors

  • R. Matzdorf

  • J. Hager

    • Institute of Physics, University of Kassel, D-34109 Kassel, Germany

  • M.A. Cazalilla

    • Donostia International Physics Center, 20018 Donostia, Spain

  • R. Jin

    • Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831, USA
    • Oak Ridge National Laboratory

  • J. He

    • Department of Physics, University of Tennessee, Knoxville, TN 37996,USA

  • David Mandrus

    • University Of Tennessee, Knoxville; ORNL
    • Condensed Matter Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831
    • Oak Ridge National Laboratory

  • Ward PLummer

    • Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831, USA and University of Tennessee, Knoxville, TN 37996, USA
    • University of Tennessee, Knoxville, TN and Oak Ridge National Laboratory, Oak Ridge, TN
    • University of Tennessee, ORNL