Quantum critical behavior in the highly random system Tl1-x Kx CuCl3 probed by zero- and longitudinal-field muon spin relaxation measurements

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

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Zero- and longitudinal-field muon-spin-relaxation (LF-μSR) measurements were carried out on the randomness-introduced quantum spin system Tl1-x Kx CuCl3. The relative temperature change in the muon-spin-relaxation rate λ in longitudinal-fields, which corresponds to the wave-vector integration of the generalized dynamical susceptibility, was deduced from LF-μSR measurements. Peak structure in the relative temperature change of λ for x=0.60 is observed at T∼3 K in 3950 G, and the temperature where the peak is observed decreases with decreasing the magnetic field. This behavior is interpreted as the soft mode of spin waves in the vicinity of the quantum critical point.

Original languageEnglish
Article number104409
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number10
Publication statusPublished - 2009 Mar 3


ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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