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Stability of charge-density waves under continuous variation of band filling in LaTe2 xSbx ,,0 x 1...
 

Summary: Stability of charge-density waves under continuous variation of band filling
in LaTe2 xSbx ,,0 x 1...
E. DiMasi*
Harrison M. Randall Laboratory of Physics, University of Michigan, Ann Arbor, Michigan 48109-1120
B. Foran
Willard H. Dow Laboratory of Chemistry, University of Michigan, Ann Arbor, Michigan 48109-1055
M. C. Aronson
Harrison M. Randall Laboratory of Physics, University of Michigan, Ann Arbor, Michigan 48109-1120
S. Lee
Willard H. Dow Laboratory of Chemistry, University of Michigan, Ann Arbor, Michigan 48109-1055
Received 9 February 1996; revised manuscript received 26 April 1996
We report the presence of charge-density waves CDW's in the planar square lattices of the layered
compounds LaTe2 xSbx for 0 x 1, which we have studied through electron microprobe analysis, powder-
and single-crystal x-ray diffraction, and transmission electron microscopy. We have identified superlattice
reflections with wave vectors spanning large parallel sheets of Fermi surfaces derived from extended-Hu¨ckel
tight-binding band calculations performed on two-dimensional Te square sheets. As Sb substitutes for Te in
LaTe2 , the band filling of the square sheets is continuously decreased, with essentially no deviation from the
LaTe2 substructure. Through the series, the CDW wave vector follows the changes in the Fermi surface. The
CDW's are observed at room temperature and we see no evidence of significant disorder effects with Sb
doping. This work establishes LaTe2 xSbx as a family of materials in which the CDW is dependent on

  

Source: Aronson, Meigan - Department of Physics and Astronomy, SUNY at Stony Brook

 

Collections: Materials Science; Physics