Abstract
Ac susceptibility (χac) measurements on Pr(Os1−xRux)4Sb12 single crystals for x = 0.05 and 0.1 were performed by mutual inductance method. A peak structure caused by anomalously enhanced flux pinning force, which is so-called the peak effect, appears in the H dependence of χac. The peak structure shifts to lower fields as T increases and disappears in T > 1 K in both samples, while in PrOs4Sb12 it is observable up to near Tc. This fact indicates that the Ru substitution suppresses the peak effect. We demonstrate that the observed T dependent behavior of the peak structure can be explained roughly by the synchronization model although there remains deviation from the model curve, suggesting some modification may be needed in the model to be applied to Pr(Os1−xRux)4Sb12.
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