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

Research output: Contribution to journalArticle

Abstract

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
Volume83
Issue number8
DOIs
Publication statusPublished - 2014 Aug 15

    Fingerprint

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this