Field-induced antiferromagnetic transition in CeIrIn

徳永 陽  ; 鈴木 通人*; Krmer, S.*; 酒井 宏典   ; 神戸 振作  ; 播磨 尚朝*; 青木 大*; Horvati, M.*; Sheikin, I.*

Tokunaga, Yo; Suzuki, Michito*; Krmer, S.*; Sakai, Hironori; Kambe, Shinsaku; Harima, Hisatomo*; Aoki, Dai*; Horvati, M.*; Sheikin, I.*

We report low-temperature In nuclear magnetic resonance (NMR) study of the prototypical heavy-fermion compound CeIrIn in high magnetic fields applied close to the crystallographic axis. For this orientation, a field-induced transition was previously reported to take place at about 28~T. Although we do not observe any change of the NMR spectrum above the transition, the intensity of the NMR lines drastically decreases as a consequence of a considerable shortening of the relaxation time. In addition, shows a pronounced maximum at the transition. Taking into account previous high-field de Haas-van Alphen results in conjunction with band-structure calculations, our NMR results are most naturally explained by the field-induced transition into an antiferromagnetic state with the propagation vector and magnetic moments aligned antiferromagnetically along the axis.