Angle-resolved photoemission study of the evolution of band structure and charge density wave properties in(, La, Ce, Sm, Gd, Tb, and Dy)
- 4 June 2008
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 77 (23), 235104
- https://doi.org/10.1103/physrevb.77.235104
Abstract
We present a detailed angle-resolved photoemission spectroscopy (ARPES) investigation of the family, which sets this system as an ideal “textbook” example for the formation of a nesting driven charge density wave (CDW). This family indeed exhibits the full range of phenomena that can be associated to CDW instabilities, from the opening of large gaps on the best nested parts of Fermi surface (up to 0.4 eV), to the existence of residual metallic pockets. ARPES is the best suited technique to characterize these features, thanks to its unique ability to resolve the electronic structure in space. An additional advantage of is that the band structure can be very accurately described by a simple two dimensional tight-binding (TB) model, which allows one to understand and easily reproduce many characteristics of the CDW. In this paper, we first establish the main features of the electronic structure by comparing our ARPES measurements with the linear muffin-tin orbital band calculations. We use this to define the validity and limits of the TB model. We then present a complete description of the CDW properties and of their strong evolution as a function of . Using simple models, we are able to reproduce perfectly the evolution of gaps in space, the evolution of the CDW wave vector with , and the shape of the residual metallic pockets. Finally, we give an estimation of the CDW interaction parameters and find that the change in the electronic density of states , due to lattice expansion when different ions are inserted, has the correct order of magnitude to explain the evolution of the CDW properties.
Keywords
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