Influence of Fe doping on the Yb valence state and the magnetic structures in HoFe6Sn6-type YbMn6-yFeySn6 alloys (y ≤ 1.00)

JOURNAL OF ALLOYS AND COMPOUNDS

卷:875

Article

Magnette, A.¹  Eichenberger, L.¹  Diop, L. V. B.¹  Venturini, G.¹  Nataf, L.²  Baudelet, F.²  Verniere, A.¹  Mazet, T.¹ 

[1] Univ Lorraine, CNRS, IJL, F-54000 Nancy, France

[2] UR1 CNRS, Synchrotron SOLEIL, St Aubin BP 48, F-91192 Gif Sur Yvette, France

关键词: Intermetallics;    Magnetic structures;    Intermediate valence;    kagome plane;   

DOI  :  10.1016/j.jallcom.2021.160091

来源: Elsevier

【 摘 要 】

We determine the magnetic structures of HoFe6Sn6-type (Immm) YbMn6-yFeySn6 alloys (y=0.25, 0.50, 0.75 and 1.00) from powder neutron diffraction experiments. The valence state and local magnetism of Yb are investigated using X-ray Near Edge Spectroscopy (XANES) and X-ray Magnetic Circular Dichroism (XMCD) at the Yb L-3 edge. The mean Yb valence decreases upon Fe doping (from nu similar to 2.66 down to nu similar to 2.46) and there is no 4f Yb magnetism throughout the series. The Fe for Mn substitution leads to change in the spins arrangement of the 3d sublattice by reinforcing antiferromagnetic exchange interactions without significant change in T=Mn/Fe moment magnitude (m similar to 2.35 mu(B)). The ground state of the alloy with y=0.25 is ferromagnetic whilst Fe richer alloys are helimagnets with wave-vector k=0, q(y), 0. The turn-angle increase upon Fe doping manifests by a mitigation of the Yb L-3 dichroic effect, solely due to hybridization between its 5d states and the self-polarized 3d states of T. (C) 2021 Elsevier B.V. All rights reserved.

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