TY - JOUR
T1 - Microscopic magnetic properties of the itinerant metamagnet UCoAl by X-ray magnetic circular dichroism
AU - Combier, Tristan
AU - Palacio-Morales, Alexandra
AU - Sanchez, Jean Pierre
AU - Wilhelm, Fabrice
AU - Pourret, Alexandre
AU - Brison, Jean Pascal
AU - Aoki, Dai
AU - Rogalev, Andrei
N1 - Funding Information:
This work has been supported by the French ANR grant SINUS No. ANR-51609-BLANC-0146 and the European ERC grant "New Heavy Fermion" No. ERC-2010-SGr-20091028. One of us (D.A.) acknowledges support from JSPS KAKENHI Grant Number 25247055, ICC-IMR (Tohoku University), and REIMEI (JAEA) programs.
Publisher Copyright:
©2017 The Physical Society of Japan.
PY - 2017
Y1 - 2017
N2 - The itinerant metamagnet UCoAl has been investigated by high field X-ray magnetic circular dichroism (XMCD) at the U M4,5 and Co K edges. The orbital and spin moments of U at 2.1 K for H || c applied below and above the first order metamagnetic transition field (HM) have been determined. The magnetism of UCoAl is dominated by the U moment. There is no evidence for any change of the orbital to spin moment ratio (∼-2.05) across HM and within the ferromagnetic phase up to 17 T. The possibility of a Fermi surface reconstruction at HM remains an open option. XMCD at the Co K-edge reveals the presence of a small Co 4p-orbital moment parallel to the macroscopic magnetization. In addition, the Co 3d-moment is estimated to be at most 0.1 μB at 17 T. The similar field dependence of the U and Co magnetizations indicates that the Co moment is induced by the U moment.
AB - The itinerant metamagnet UCoAl has been investigated by high field X-ray magnetic circular dichroism (XMCD) at the U M4,5 and Co K edges. The orbital and spin moments of U at 2.1 K for H || c applied below and above the first order metamagnetic transition field (HM) have been determined. The magnetism of UCoAl is dominated by the U moment. There is no evidence for any change of the orbital to spin moment ratio (∼-2.05) across HM and within the ferromagnetic phase up to 17 T. The possibility of a Fermi surface reconstruction at HM remains an open option. XMCD at the Co K-edge reveals the presence of a small Co 4p-orbital moment parallel to the macroscopic magnetization. In addition, the Co 3d-moment is estimated to be at most 0.1 μB at 17 T. The similar field dependence of the U and Co magnetizations indicates that the Co moment is induced by the U moment.
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U2 - 10.7566/JPSJ.86.024712
DO - 10.7566/JPSJ.86.024712
M3 - Article
AN - SCOPUS:85014695657
SN - 0031-9015
VL - 86
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
IS - 2
M1 - 024712
ER -