Abstract
The behavior of vortex system in the presence of columnar defects in La1.85Sr0.15CuO4 single crystal is studied by AC susceptibility measurements. It is found that the imaginary part χ″ of the susceptibility as a function of temperature has a single peak, consistent with the Bose-glass theory, forB Bcr, χ″ exhibits double peaks, indicating the liquid-glass transition proceeds via two steps. The origin of the successive transitions is discussed.
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