Gradual evolution in spin dynamics of TlCu_(1-x)Mg_xCl_3 probed by muon-spin-relaxation (μSR) technique

摘要

Longitudinal-field muon-spin-relaxation (LF-μSR) measurements in TlCu_(1-x)Mg_xCl_3 were carried out to investigate the spin dynamics in the non-magnetic impurity doped spin gap system. As reported before, in the case of x ≥ 0.006, LF-μSR time spectra are well fitted by the two components function, which means the phase separation to a spin frozen region and to a spin flucuating region. In this report, we focus on the spin fluctuating region, and discuss the gradual change in its magnetic properties with increasing the Mg-doping.