Nonpareil Yb Behavior in YbMn6Ge6-xSnx

We investigate the temperature dependence of the Yb valence in YbMn6Ge1.8Sn4.2 and YbMn6Ge1.6Sn4.4 using resonant inelastic x-ray scattering experiments. Yb is found to be in an intermediate valent state in the whole investigated temperature range (10-450 K). We thus prove that the unusually high magnetic ordering temperature of Yb (similar to 60 and 90 K for x = 4.2 and 4.4, respectively) involves an intermediate valent Yb, an unprecedentedly observed phenomenon. Further, an anomalous increase in the Yb valence is observed upon cooling. A scenario is proposed to explain this unusual behavior. It is based on the presence of magnetically ordered Mn moments and on an Anderson Hamiltonian with a Zeeman term modeling the magnetic interactions.


Published in:
Physical Review Letters, 111, 9
Year:
2013
Publisher:
College Pk, American Physical Society
ISSN:
0031-9007
Laboratories:




 Record created 2013-10-01, last modified 2018-03-17


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