Disappearance of gapped Mott insulating phase neighboring Bose glass phase in Tl1-xKxCuCl3 detected by longitudinal-field muon spin relaxation

Takao Suzuki, Hanjie Guo, Ikuto Kawasaki, Isao Watanabe, Takayuki Goto, Kazuya Katayama, Hidekazu Tanaka

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Longitudinal-field muon spin-relaxation (LF-μSR) measurements have been performed in a bond-randomness introduced quantum spin system, Tl1-xKx CuCl3 with x = 0.40, in which the appearance of a Bose glass (BG) phase adjacent to the Bose-Einstein condensation (BEC) phase of excited triplets is observed. In the zero- field limit below 500 G, LF-μSR time spectra shows an exponential-like decay, and the muon spin-relaxation rate does not have a significant temperature dependence down to 25 mK. This indicates that spins fluctuate in time and in space, and that the spin system is not into a spin gapped state. It is suggested that the theoretically predicted gapped Mott insulating phase adjacent to the BG phase disappears in this case. This result obtained by microprobe LF-μSR measurements is consistent with an indication deduced from the results of macroscopic magnetization measurements.

Original languageEnglish
Article number084703
Journaljournal of the physical society of japan
Issue number8
Publication statusPublished - 2014 Aug 15

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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