Ytterbium Divalency And Lattice Disorder in Near-Zero Thermal Expansion YbGaGe
Journal Article
·
· Phys. Rev. B75:012301,2007
OSTI ID:954011
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.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-76SF00515
- OSTI ID:
- 954011
- Report Number(s):
- SLAC-REPRINT-2009-381; TRN: US201004%%748
- Journal Information:
- Phys. Rev. B75:012301,2007, Vol. 75; ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION SPECTRA
CRYSTAL LATTICES
DEFECTS
GALLIUM COMPOUNDS
GERMANIUM COMPOUNDS
IMPURITIES
INTERMETALLIC COMPOUNDS
NEUTRON DIFFRACTION
ORDER-DISORDER TRANSFORMATIONS
INELASTIC SCATTERING
STOICHIOMETRY
THERMAL EXPANSION
VALENCE
X-RAY SPECTROSCOPY
YTTERBIUM COMPOUNDS
Other
OTHER
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION SPECTRA
CRYSTAL LATTICES
DEFECTS
GALLIUM COMPOUNDS
GERMANIUM COMPOUNDS
IMPURITIES
INTERMETALLIC COMPOUNDS
NEUTRON DIFFRACTION
ORDER-DISORDER TRANSFORMATIONS
INELASTIC SCATTERING
STOICHIOMETRY
THERMAL EXPANSION
VALENCE
X-RAY SPECTROSCOPY
YTTERBIUM COMPOUNDS
Other
OTHER