The effect of randomness on the quantum spin system Tl1-xK xCuCl3 with x = 0:44 studied by the zero-field muon-spin-relaxation (ZF-μSR) method

Takao Suzuki, Fumiko Yamada, Isao Watanabe, Takayuki Goto, Akira Oosawa, Hidekazu Tanaka

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Zero-field muon-spin-relaxation (ZF-μSR) measurements were carried out down to 80 mK on the randomness bond system Tl1-xK xCuCl3 with x = 0.44. Time spectra are well fitted by the stretched exponential function exp(-λt)β. The muon spin relaxation rate λ increases rapidly with decreasing temperature, and β tends to 0.5 at 80 mK. The divergent increase of λ suggests the critical slowing down of the frequency of the Cu-3d spin fluctuations toward a spin frozen state below 80 mK, and the root-exponential-like behavior of the time spectrum indicates that the origin of the relaxation is possibly the spatially-fixed fluctuating dilute moments.

Original languageEnglish
Article number074704
JournalJournal of the Physical Society of Japan
Issue number7
Publication statusPublished - 2007 Jul 1



  • Bose glass phase
  • Bose-Einstein condensation
  • Magnon
  • Randomness
  • Spin gap
  • TlKCuCl
  • μSR

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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