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Phys. Rev. Lett. 100, 196402 (2008) [4 pages]

Pseudogap and Charge Density Waves in Two Dimensions

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S. V. Borisenko1, A. A. Kordyuk1,2, A. N. Yaresko3, V. B. Zabolotnyy1, D. S. Inosov1, R. Schuster1, B. Büchner1, R. Weber4, R. Follath4, L. Patthey5, and H. Berger6
1Leibniz-Institute for Solid State Research, IFW-Dresden, D-01171, Dresden, Germany
2Institute of Metal Physics, 03142 Kyiv, Ukraine
3Max-Planck-Institute for the Physics of Complex Systems, Dresden, Germany
4BESSY, Berlin, Germany
5Swiss Light Source, Paul Scherrer Institut, CH-5234 Villigen, Switzerland
6Institute of Physics of Complex Matter, EPFL, 1015 Lausanne, Switzerland

Received 10 October 2007; published 13 May 2008

Using angle-resolved photoemission spectroscopy we demonstrate that a normal-state pseudogap exists above TN-IC in one of the most studied two-dimensional charge-density wave (CDW) dichalcogenides 2H-TaSe2. The initial formation of the incommensurate CDW is confirmed as being driven by a conventional nesting instability, which is marked by a pseudogap. The magnitude, character, and anisotropy of the 2D-CDW pseudogap bear considerable resemblance to those seen in superconducting cuprates.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.196402
DOI:
10.1103/PhysRevLett.100.196402
PACS:
71.45.Lr, 79.60.−i
 
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