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We study the extent of the reversible region in the vortex phase diagram ofrecently available RbOs$_2$O$_6$ single crystals \cite{Rogacki08a} by means ofbulk magnetization measurements. We found that the irreversible magneticresponse sets in at a field $H_{\rm irr}(T) \sim 0.3 H_{\rm c2}(T)$ for $0.5\lesssim T/T_{\rm c} \lesssim 0.8$, yielding a reversible vortex region that isuncommonly wide in comparison with typical low-$T_{\rm c}$ materials. Therelevance of thermal fluctuations is limited since we estimate a Ginzburgnumber $G_{\rm i} = 5 \times 10^{-7}$. However, the relevance of quencheddisorder is unconventionally low since the critical-current density ratio atlow fields and temperatures is of the order of that found in high-T$_{\rmc}$'s. We therefore conclude that an intrinsically low bulk pinning magnitudefavors the existence of an unexpectedly wide reversible vortex region thatseems to be generic to $\beta$-pyrochlores.

Unexpectedly wide reversible vortex region in $\beta$-pyrochlore RbOs$_{2}$O$_{6}$