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Photoemission spectroscopy and the unusually robust one-dimensional physics of lithium purple bronze
L Dudy1, J D Denlinger, J W Allen
1Randall Laboratory, University of Michigan, Ann Arbor, 48109, USA. lenart.dudy@physik.uni-wuerzburg.de
Abstract:
Temperature-dependent photoemission spectroscopy in Li(0.9)Mo(6)O(17) contributes to evidence for one-dimensional (1D) physics that is unusually robust. Three generic characteristics of the Luttinger liquid are observed: power law behavior of the k-integrated spectral function down to temperatures just above the superconducting transition, k-resolved lineshapes that show holon and spinon features, and quantum critical (QC) scaling in the lineshapes. Departures of the lineshapes and the scaling from expectations in the Tomonaga-Luttinger model can be partially described by a phenomenological momentum broadening that is presented and discussed. The possibility that some form of 1D physics obtains even down to the superconducting transition temperature is assessed.
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