Abstract
Vortex dynamics is investigated in Bi2+xSr2−(x+y)LayCuO6+δ (Bi-2201) and Bi2Sr2CaCu2Oy (Bi-2212) irradiated with 3.5 GeV 136Xe31+ ions through the relation between the frequency and the loss peak temperature in ac susceptibility in order to seek the Bose-glass transition. The Bose-glass behavior is observed at fields below about half of matching filed, BΦ/2 in irradiated Bi-2212. On the contrary to irradiated Bi-2212, the Bose-glass behavior is not observed in irradiated Bi-2201. This is due to the extremely weak coupling of pancake vortices along the c axis in Bi-2201 in spite of the presence of columnar defects. The pancake vortices in Bi-2201 irradiated with heavy-ions are almost decoupled, resulting in the occurrence of thermally activated flux flow or creep.
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