Bose-glass state in one-dimensional random antiferromagnets (original) (raw)

One-dimensional random antiferromagnets ͑CH 3 ͒ 2 CHNH 3 Cu͑Cl x Br 1−x ͒ 3 ͓abbreviated as IPA-Cu͑Cl x Br 1−x ͒ 3 ͔ show three magnetic phases: Cl rich, intermediate, and Br rich. In this study, to confirm the presence of a gapped or gapless state in addition to a Bose-glass ͑BG͒ state of spin triplets at two magnetic phase boundaries, magnetic susceptibility, specific heat, and magnetization were measured. Contrary to our proposed model, the results suggest a gapless state and a BG state at the Br-rich phase boundary, and a spin-gap state at the Cl-rich phase boundary. From the viewpoints of the universality class, the BG state may be interpreted as a result of Anderson localization. Therefore, IPA-Cu͑Cl x Br 1−x ͒ 3 are intriguing compounds for studying the BG state because of good one dimensionality.

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