Spectral consequences of broken phase coherence in 1T-TaS2
Random defects destroy long-range phase coherence, and inhibit the metal-insulator transition in the charge density wave (CDW) system 1T-TaS2. Photoelectron spectroscopy with high resolution reveals corresponding changes in the electronic structure. Core level spectra indicate a temperature-dependent limited growth of commensurate CDW domains. Screening by free carriers from the domain boundaries reduces the Coulomb repulsion in the Ta d band by similar to 1/3, compared to pure samples, yielding a finite spectral weight at the Fermi level.
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Ecole Polytech Fed Lausanne, Inst Phys Appl, CH-1015 Lausanne, Switzerland. Ecole Polytech Fed Lausanne, IGA, Lab Phys Solides Semicristallins, CH-1015 Lausanne, Switzerland. Ecole Polytech Fed Lausanne, CIME, CH-1015 Lausanne, Switzerland. Univ Wisconsin, Dept Phys, Madison, WI 53706 USA. Univ Paris Sud, LURE, F-91405 Orsay, France. Zwick, F, Ecole Polytech Fed Lausanne, Inst Phys Appl, CH-1015 Lausanne, Switzerland.
ISI Document Delivery No.: 106LH
Record created on 2006-10-03, modified on 2016-08-08