Spectral consequences of broken phase coherence in 1T-TaS/sub 2/

Random defects destroy long-range phase coherence, and inhibit the metal-insulator transition in the charge density wave (CDW) system IT-TaS/sub 2/. 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 ~I/3, compared to pure samples, yielding a finite spectral weight at the Fermi level.


Published in:
Phys. Rev. Lett., 81, 5, 1058-61
Year:
1998
Laboratories:




 Record created 2007-02-15, last modified 2018-01-27


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