Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 1: Correlated Electrons: Low-dimensional Systems - Models 1

TT 1.1: Vortrag

Montag, 26. März 2012, 09:30–09:45, H 0104

Lithium purple bronze: strong renormalization of the perpendicular hopping — •L. Dudy^1,2, J. Denlinger³, J. He⁴, and J.W. Allen¹ — ¹Randall Laboratory, University of Michigan, Ann Arbor, MI, USA — ²Julius-Maximilians-Universität Würzburg, Germany — ³Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, USA — ⁴Clemson University, Clemson, SC, USA

An interesting topic in condensed matter physics is the question of whether one dimensional (1d) behavior of the electronic structure can be realized in our 3d world. In the case of a network (or bundle) of one-dimensional chains, in the framework of the Tomonaga Luttinger model, it is found in theory that movement of electrons between neighboring chains, the ”perpendicular hopping”, can be greatly suppressed by the 1d behavior, although at a sufficiently low temperature a crossover to 3d is nonetheless expected. We will present results from angle resolved photoemission spectroscopy on single crystals of the quasi-1d lithium purple bronze (Li_0.9MoO₁₇) measured at a temperature of 6K on the Merlin beam line at the Advanced Light Source. We will show that the hopping parameter has to be extremely renormalized down from its LDA value in order to explain the experiment. Therefore, there might even be the rare possibility that the superconductivity of this material (at about 1.9K) evolves out of a 1d normal state.