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Fujii, Yutaka; Hashimoto, Hiroki; Mori, Atsushi; Tanaka, Akihiro; Chiba, Meiro; Hosokoshi, Yuko; Inoue, Katsuya; Yamamoto, Yoshiyuki; Hori, Hidenobu
Progress of theoretical physics. Supplement, 01/2005, Letnik: 159, Številka: 159Journal Article
1H-NMR study of the organic radical compound BIPNNBNO which is a two-dimensional spin-gap system has been performed under the applied field up to 7.7 T including the critical field region and in the temperature down to 0.4 K. The proton spin-lattice relaxation rate T1-1 exhibited the thermal activation-type behavior suggesting the existence of the energy gap not only in the gapped state near zero field but also in the 1/3-plateau phase above about 6 T. It was found that T1-1 increased with decreasing temperature in the critical field region between the gapped phase and the plateau phase, which is similar to what has been already observed for one-dimensional systems associated with the Tomonaga-Luttinger liquid (TLL) state.
