Resonant X-ray Diffraction Study of Antiferromagnetic Transition in GdNiC2

JPS Conf. Proc. 30, 011081 (2020) [6 pages]

Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2019)

Resonant X-ray Diffraction Study of Antiferromagnetic Transition in GdNiC₂

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Susumu Shimomura¹^,*, Noriaki Hanasaki², Hironori Nakao³, and Hideya Onodera⁴

¹Department of Physics, Kyoto Sangyo University, Kyoto 603-8555, Japan

²Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan

³Condensed Matter Research Center and Photon Factory, Institute of Materials Structure Science (IMSS), High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan

⁴Department of Physics, Tohoku University, Sendai 980-8578, Japan

Received September 17, 2019

Resonant X-ray diffraction measurements on the antiferromagnet GdNiC₂ were performed using synchrotron radiation. The polarization analysis revealed resonant X-ray diffraction peaks characterized by the wave vector \((1/2,1/2,0)\), whose intensity was enhanced near the L₂ absorption edge of Gd. The intensity of the resonant diffraction peak decreased monotonically with increasing temperature toward an antiferromagnetic transition temperature. The antiferromagnetic order coexists with a charge density wave (CDW), and its magnetic wave vector is the same as the CDW wave vector. The 030 magnetic diffraction peak was also observed. These results suggest a noncollinear antiferromagnetic arrangement of Gd moments.

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https://doi.org/10.7566/JPSCP.30.011081

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