Antiferromagnetic resonance in the quasi-one-dimensional magnet IPACu(ClxBr1−x)3 (x=0.83)

• Published in: Journal of the Korean Physical Society Vol. 62; no. 12; pp. 2073 - 2076
• Main Authors: Fujita, Takahito, Hagiwara, Masayuki, Manaka, Hirotaka
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01.06.2013; 한국물리학회
• Subjects: Mathematical and Computational Physics; Particle and Nuclear Physics; Physics; Physics and Astronomy; Theoretical; 물리학; One-dimensional magnet; Antiferromagnetic resonance; Magnetization; ESR
• ISSN: 0374-4884; 1976-8524
• DOI: 10.3938/jkps.62.2073

We have performed multi-frequency electron spin resonance (ESR) and magnetization measurements on single crystals of the quasi one-dimensional magnet IPACu(Cl x Br 1− x ) 3 ( x =0.83) in magnetic fields H along the b -axis at temperatures below an antiferromagnetic long-range ordering temperature ( T N ≅ 13 K). We observed some ESR branches for typical antiferromagnetic modes with biaxial anisotropy at 1.5 K (≪ T N ). We have analyzed the magnetization curve and the ESR excitation modes for H ∥ b by using a two sub-lattice model and obtained good agreement between experiment and calculation. In addition, we show that the origin of a field-induced magnetization jump is a spin-flop transition. These results show that the phase at temperatures below T N in this Cl-Br mixed compound can be described as a simple two sub-lattice antiferromagnet.