Direct observation of Fe spin reorientation in single crystalline YbFe6Ge6
M. A. Avila, T. Takabatake, Y. Takahashi, S. L. Bud'ko, P. C. Canfield
TL;DR
This study reports the discovery of a temperature-induced Fe spin reorientation in single crystalline YbFe6Ge6, revealing unique magnetic behavior among RFe6Ge6 compounds with potential implications for magnetic materials.
Contribution
First observation of Fe spin reorientation in YbFe6Ge6, highlighting a novel magnetic transition in this family of compounds.
Findings
Fe spin reorientation occurs at about 63 K
YbFe6Ge6 exhibits anisotropic magnetic properties
Yb valency confirmed by XANES
Abstract
We have grown single crystals of YbFe6Ge6 and LuFe6Ge6 and characterized their anisotropic behaviour through low field magnetic susceptibility, field-dependent magnetization, resistivity and heat capacity measurements. The Yb+3 valency is confirmed by LIII XANES measurements. YbFe6Ge6 crystals exhibit a field-dependent, sudden reorientation of the Fe spins at about 63 K, a unique effect in the RFe6Ge6 family (R = rare earths) where the Fe ions order anti-ferromagnetically with Neel temperatures above 450 K and the R ions' magnetism appears to behave independently. The possible origins of this unusual behaviour of the ordered Fe moments in this compound are discussed.
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