Ytterbium divalency and lattice disorder in near-zero thermal expansion YbGaGe

Details Ytterbium divalency and lattice disorder in near-zero thermal expansion YbGaGe Ytterbium divalency and lattice disorder in near-zero thermal expansion YbGaGe

2006-11-07

arxiv.org/abs/cond-mat/0611166v1

Physics

Condensed Matter

Materials Science

4 pages, 4 figure, supplementary info

Scientific paper

While near-zero thermal expansion (NZTE) in YbGaGe is sensitive to stoichiometry and defect concentration, the NZTE mechanism remains elusive. We present x-ray absorption spectra that show unequivocally that Yb is nearly divalent in YbGaGe and the valence does not change with temperature or with nominally 1% B or 5% C impurities, ruling out a valence-fluctuation mechanism. Moreover, substantial changes occur in the local structure around Yb with B and C inclusion. Together with inelastic neutron scattering measurements, these data indicate a strong tendency for the lattice to disorder, providing a possible explanation for NZTE in YbGaGe.

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