Low-energy spin dynamics in randomness-introduced spin-gap systems

Takao Suzuki, Fumiko Yamada, Motoki Yamada, Takayuki Kawamata, Yasuyuki Ishii, Isao Watanabe, Takayuki Goto, Hidekazu Tanaka

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Zero- and longitudinal-field muon spin-relaxation (ZF- and LF-μSR) measurements were carried out on randomness-introduced quantum spin-gap systems Tl 1-x K x CuCl 3 in the wide range of x from 0.40 to 0.65. The temperature changes in the muon spin-relaxation rate λ in longitudinal fields were deduced from LF-μSR measurements. Peak structure in the temperature change in λ in 3950 G, which suggests the soft mode of spin waves, is observed in the region of x>0.53, although a finite frequency of spin fluctuations remains down to T=0, i.e., the ground state is paramagnetic. The temperature giving the peak in λ decreases with decreasing the concentration of x and the peak structure vanishes in x=0.51. In the case of x=0.40, however, λ shows the different behavior and λ in lower fields increases with decreasing temperature down to 0.28 K. The increase in λ is possibly interpreted as a precursor of the transition to the reported Bose-glass phase. These results suggest a possibility of the existence of the quantum critical point from the Bose-glass phase to a paramagnetic phase around x=0.51.

Original languageEnglish
Article number094447
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume82
Issue number9
DOIs
Publication statusPublished - 2010 Sep 29
Externally publishedYes

Fingerprint

Spin dynamics
spin dynamics
muons
Spin fluctuations
Glass
Temperature
Spin waves
temperature
energy
glass
Ground state
magnons
critical point
ground state

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Low-energy spin dynamics in randomness-introduced spin-gap systems. / Suzuki, Takao; Yamada, Fumiko; Yamada, Motoki; Kawamata, Takayuki; Ishii, Yasuyuki; Watanabe, Isao; Goto, Takayuki; Tanaka, Hidekazu.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 82, No. 9, 094447, 29.09.2010.

Research output: Contribution to journalArticle

Suzuki, Takao ; Yamada, Fumiko ; Yamada, Motoki ; Kawamata, Takayuki ; Ishii, Yasuyuki ; Watanabe, Isao ; Goto, Takayuki ; Tanaka, Hidekazu. / Low-energy spin dynamics in randomness-introduced spin-gap systems. In: Physical Review B - Condensed Matter and Materials Physics. 2010 ; Vol. 82, No. 9.
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