Charge density wave formation in $R_{2}$Te$_{5}$ ($R$=Nd, Sm and Gd)

Details Charge density wave formation in $R_{2}$Te$_{5}$ ($R$=Nd, Sm and Gd) Charge density wave formation in $R_{2}$Te$_{5}$ ($R$=Nd, Sm and Gd)

2007-12-13

arxiv.org/abs/0712.2064v1

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 6 figures

Scientific paper

10.1103/PhysRevB.77.165101

The rare earth ($R$) tellurides $R_2$Te$_5$ have a crystal structure intermediate between that of $R$Te$_2$ and $R$Te$_3$, consisting of alternating single and double Te planes sandwiched between $R$Te block layers. We have successfully grown single crystals of Nd$_2$Te$_5$, Sm$_2$Te$_5$ and Gd$_2$Te$_5$ from a self flux, and describe here the first evidence for charge density wave formation in these materials. The superlattice patterns for all three compounds are relatively complex, consisting at room temperature of at least two independent wavevectors. Consideration of the electronic structure indicates that to a large extent these wave vectors are separately associated with sheets of the Fermi surface which are principally derived from the single and double Te layers.

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