μSR study on the ground state of bond-disordered spin gap system (CH3)2CHNH3Cu(Cl1-xBr x)3 (x=0.95, 0.88)

T. Goto, T. Suzuki, S. Nakajima, K. Kanada, T. Saito, A. Oosawa, I. Watanabe, H. Luetkens, A. Amato

Research output: Contribution to journalConference article

Abstract

Solid solution of the two spin gap systems (CH3) 2CHNH3CuX3 (X=Cl, Br) was reported from results of macroscopic measurements to be gapless when fraction of Cl content x is in between 0.44 and 0.87, and otherwise remains gapped. We have investigated by μSR the ground state of Cl-rich gapped region x=0.95 and 0.88 to find that they are microscopically phase separated into two components, magnetic tiny islands and singlet sea surrounding them. With decreasing temperature, the characteristic frequency of spin fluctuation in islands showed a significant slow down. However, the slow down ceased around 1 K, below which the spin fluctuation spectrum did not change down to 15 mK. These results indicate that unlike the Br-rich system x <0.44 where appearance of an exotic ground state has been argued, the Cl-rich system x >0.87 persists to be paramagnetic without showing a long-range order. This difference is considered to be originated in the robustness of Haldane gap against disorder.

Original languageEnglish
Article number022011
JournalJournal of Physics: Conference Series
Volume200
Issue numberSECTION 2
DOIs
Publication statusPublished - 2010 Jan 1

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Goto, T., Suzuki, T., Nakajima, S., Kanada, K., Saito, T., Oosawa, A., Watanabe, I., Luetkens, H., & Amato, A. (2010). μSR study on the ground state of bond-disordered spin gap system (CH3)2CHNH3Cu(Cl1-xBr x)3 (x=0.95, 0.88). Journal of Physics: Conference Series, 200(SECTION 2), [022011]. https://doi.org/10.1088/1742-6596/200/2/022011