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Magnetic Structures in the Vicinity of the Pressure-Induced Superconducting Phase in CeNiC<sub>2</sub>

ORAL

Abstract

The Ce-based non-centrosymmetric strongly correlated electron system, CeNiC2, shows multiple magnetic phase transitions at low temperatures [1]. Most importantly, we have recently observed the pressured-induced heavy-fermion superconductivity in this compound below 3.5 K under 10.7 and 11GPa [2]. However, the magnetic structures of CeNiC2 have not been well studied. In order to understand the superconducting pairing mechanism, it is important to characterize the magnetic structures in the vicinity of the superconducting phase. This talk will focus on the high-pressure magnetic structure study of CeNiC2 based on our unpolarized and polarized neutron diffraction experiments using single crystals. An incommensurate antiferromagnetic phase (AFIC), in which the magnetic structure depends on pressure, is observed in a wide pressure range. The temperature and pressure dependent magnetic structures in the AFIC phase and their connections to the superconductivity will be discussed in detail.
[1] K. Motoya et al., J. Phys. Soc. Jpn. 66, 1124 (1997).
[2] S. Katano et al., Phys. Rev. B 99, 100501 (2019).

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Presenters

  • Depei Zhang

    Neutron Scattering Division, Oak Ridge National Laboratory

Authors

  • Depei Zhang

    Neutron Scattering Division, Oak Ridge National Laboratory

  • Hanming Ma

    Institute for Solid State Physics, University of Tokyo

  • Jun Gouchi

    Institute for Solid State Physics, University of Tokyo, Institute for Solid State Physics, The University of Tokyo, University of Tokyo

  • Feng Ye

    Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge National Laboratory

  • Takahiro Matsuoka

    Joint Institute for Advanced Materials, University of Tennessee, Knoxville

  • Yoshiya Uwatoko

    Institute for Solid State Physics, University of Tokyo, Institute for Solid State Physics, The University of Tokyo, University of Tokyo

  • Masaaki Matsuda

    Oak Ridge National Laboratory, Oak Ridge National Lab, Neutron Scattering Division, Oak Ridge National Laboratory, Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA