AI Article Synopsis
- YbCoGe is identified as the first material exhibiting a Remeika phase with a specific modulated crystal structure characterized by a 3 + 3 symmetry.
- Increasing the proportion of Yb in YbCoGe eliminates satellite reflections and stabilizes a disordered primitive cubic structure.
- This compound functions as a metal with hole-like charge carriers, where Yb ions exhibit a temperature-dependent intermediate valence state that fluctuates between +2.60 and +2.66 from 85 to 293 K, studied using various spectroscopy and measurement techniques.
Article Abstract
YbCoGe is the first example of a Remeika phase with a 3 + 3 [space group 4̄3(,0,0)000(0,,0)000(0,0,)000; = 8.72328(1) Å, = 0.4974(2)] modulated crystal structure. A slight shift of the composition towards higher Yb-content ( YbCoGe) leads to the disappearance of the satellite reflections and stabilization of the disordered primitive cubic [space group 3̄, = 8.74072(2) Å] Remeika prototype structure. The stoichiometric structurally modulated germanide is a metal with hole-like charge carriers, where Yb-ions are in a temperature-dependent intermediate valence state varying from +2.60 to +2.66 for the temperature range 85-293 K. The valence fluctuations have been investigated by means of temperature dependent X-ray absorption spectroscopy, magnetic susceptibility and thermopower measurements.
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| http://dx.doi.org/10.1039/d1dt01972d | DOI Listing |
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