Temperature-Dependent Pseudogap And Electron Localization In 1T-Tas2

Photoelectron spectroscopy reveals a striking correspondence between charge-density-wave-related phase transitions and modifications of the electronic structure in 1T-TaS2. High-energy-resolution spectra indicate that the collapse of the Fermi surface is abrupt at the quasicommensurate-commensurate transition (approximately 185 K) and that, below this critical temperature, the Fermi level lies in a deep, temperature-dependent pseudogap. These results strongly suggest successive localizations due to electron correlations and disorder, and resolve an outstanding contradiction between transport data and previous spectroscopic results with lower resolution.


Published in:
Physical Review B, 45, 1462-1465
Year:
1992
Keywords:
Laboratories:




 Record created 2010-04-07, last modified 2018-03-17


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