open access

https://hdl.handle.net/2115/96144

Anisotropic Magnetic Field–Temperature Phase Diagrams in CeCoSi

英語

2025-03-15

Physical Society of Japan

Journal of the Physical Society of Japan

94(3)

034706

The Ce-based metallic compound CeCoSi with a tetragonal structure exhibits an antiferromagnetic ordering at TN = 9.4 K and a nonmagnetic (NM) ordering accompanied by a uniform lattice distortion at T0 ∼ 12 K. A magnetic field (H)-induced phase transition accompanied by a change in the crystal structure occurs at an ordering temperature of Ts1 in the NM ordering state for 𝐻∥[100] [Matsumura et al., J. Phys. Soc. Jpn. 91, 064704 (2022)]. To construct detailed magnetic field–temperature (H–T) phase diagrams of this compound, including the H dependence of Ts1 near the zero field, we have performed magnetization, electrical resistivity, and specific heat measurements under H parallel to the [100] and [110] directions. The present bulk measurements indicate that the Ts1 transition is absent for 𝐻∥[110]. Furthermore, it can be deduced that Ts1, observed only for 𝐻∥[100], coincides with T0 at zero field. The revealed anisotropic phase diagrams offer valuable insights into the symmetry of the order parameter in the nontrivial NM ordering of CeCoSi.

学術雑誌論文

Accepted Manuscript

©2025 The Physical Society of Japan

0031-9015

1347-4073

AA00704814