Three-stage Phase Transitions and Field-induced Phases in CeCoSi; A Landau Theory

Ishitobi, Takayuki

We investigate both the nonmagnetic and magnetic ordered phases of CeCoSi using Landau theory. Our analysis predicts that three successive phase transitions occur at zero magnetic field. A quadrupole order parameter that emerges below $_{0}$ = 12 K acts as a weak symmetry-breaking field on the antiferromagnetic ordering below $T_{rm N}$ = 9.4 K, giving rise to two-stage magnetic transitions. In the higher-temperature antiferromagnetic phase in the temperature range in $T_{rm s2}$ = 8 K $T_{rm N}$ , an out-of-plane component of antiferromagnetic moment may be present or absent. If present, magnetic fields applied along the [100] and [110] directions induce additional magnetic phases.

Language	:	English
Journal	:	Journal of the Physical Society of Japan
Volume	:	94
Number	:	7
Pages	:	p.073703_1 - 073703_4
Publication Year/Month	:	2025/06
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Paper URL	:	https://doi.org/10.7566/JPSJ.94.073703
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Registration No. : AA20250205
JAEA Abstracts No. : 53000798
Paper Submission No. : 29592

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