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 a low-temperature In nuclear magnetic resonance (NMR) study of the heavy-fermion compound CeIrIn under high magnetic fields applied nearly parallel to the crystallographic axis. A previously unresolved field-induced transition is observed at approximately 28T. Although no spectral changes are detected across the transition, the NMR signal intensity drops sharply due to a significant reduction in the spin-spin relaxation time , and shows a pronounced peak. These features indicate a field-induced antiferromagnetic (AF) state with propagation vector or , and magnetic moments aligned along the axis. Band-structure calculations favor the latter, consistent with prior de Haas-van Alphen data, making CeIrIn a rare case of field-induced AF magnetism along the field direction.