Abstract
A superconducting state has recently been observed by only a slight copper doping (∼4%) of the metallic 2D commensurate charge-density-wave (CDW) phase of titanium diselenide. We have employed high-resolution photoemission spectroscopy (ARPES) to probe the evolution of low-lying states, providing evidence that the CDW in the doped system is not due to Fermi surface nesting. With increasing copper concentration, we observe a significant rise of the chemical potential and a manifold of low-lying states at the top of the Fermi sea with increasing particle-hole asymmetry. These effects taken together contribute to destabilize the observed commensurate electronic, possibly, excitonic order in the vicinity of the superconducting doping in this system.
Original language | English (US) |
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Pages (from-to) | 1002-1004 |
Number of pages | 3 |
Journal | Physica B: Condensed Matter |
Volume | 403 |
Issue number | 5-9 |
DOIs | |
State | Published - Apr 1 2008 |
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering
Keywords
- CDW
- Superconductor