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Cichorek et al. [Phys. Rev. Lett. 94, 107002 (2005)] reported enhancements ofthe lower critical field Hc1(T) and critical current in superconductingPrOs4Sb12 below a transition temperature Tc3 ~ 0.6 K, and speculated that thisreflects a transition between superconducting phases. Features have beenobserved near Tc3 in other properties, but not in the specific heat. We reportmuon spin rotation measurements of the penetration depth in the vortex state ofPrOs4Sb12 near Hc1(T), that to high accuracy exhibit no anomaly Tc3 andtherefore cast doubt on the putative phase transition.

Comment on "Pronounced Enhancement of the Lower Critical Field and Critical Current Deep in the Superconducting State of PrOs4Sb12"