Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-12-13
Eur. Phys. J. B63, 11 (2008)
Physics
Condensed Matter
Strongly Correlated Electrons
Scientific paper
10.1140/epjb/e2008-00205-y
We investigate the rare-earth polychalcogenide $R_2$Te$_5$ ($R$=Nd, Sm and Gd) charge-density-wave (CDW) compounds by optical methods. From the absorption spectrum we extract the excitation energy of the CDW gap and estimate the fraction of the Fermi surface which is gapped by the formation of the CDW condensate. In analogy to previous findings on the related $R$Te$_n$ (n=2 and 3) families, we establish the progressive closing of the CDW gap and the moderate enhancement of the metallic component upon chemically compressing the lattice.
Degiorgi Leonardo
Fisher Ian R.
Pfuner F.
Shin K. Y.
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