TY - JOUR
T1 - Disappearance of gapped Mott insulating phase neighboring Bose glass phase in Tl1-xKxCuCl3 detected by longitudinal-field muon spin relaxation
AU - Suzuki, Takao
AU - Guo, Hanjie
AU - Kawasaki, Ikuto
AU - Watanabe, Isao
AU - Goto, Takayuki
AU - Katayama, Kazuya
AU - Tanaka, Hidekazu
N1 - Publisher Copyright:
© 2014 The Physical Society of Japan.
PY - 2014/8/15
Y1 - 2014/8/15
N2 - 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.
AB - 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.
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U2 - 10.7566/JPSJ.83.084703
DO - 10.7566/JPSJ.83.084703
M3 - Article
AN - SCOPUS:84924976241
SN - 0031-9015
VL - 83
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
IS - 8
M1 - 084703
ER -