Physics – Condensed Matter – Superconductivity
Scientific paper
2004-09-13
PRL v. 94, 107002 (2005)
Physics
Condensed Matter
Superconductivity
4 pages, 3 figures, submitted to Physical Review Letters. v2: small corrections to references, updated figure 3
Scientific paper
10.1103/PhysRevLett.94.107002
We have observed an unexpected enhancement of the lower critical field $H_{c1}(T)$ and the critical current $I_{c}(T)$ deep in the superconducting state below $T \approx 0.6$ K ($T/T_{c} \approx 0.3$) in the filled skutterudite heavy fermion superconductor PrOs$_4$Sb$_{12}$. From a comparison of the behavior of $H_{c1}(T)$ with that of the heavy fermion superconductors U$_{1-x}$Th$_x$Be$_{13}$ and UPt$_3$, we speculate that the enhancement of $H_{c1}(T)$ and $I_{c}(T)$ in PrOs$_4$Sb$_{12}$ reflects a transition into another superconducting phase that occurs below $T/T_{c} \approx 0.3$. An examination of the literature reveals unexplained anomalies in other physical properties of PrOs$_4$Sb$_{12}$ near $T/T_{c} \approx 0.3$ that correlate with the features we have observed in $H_{c1}(T)$ and $I_{c}(T)$.
Cichorek Tomasz
Frederick N. A.
Maple Brian M.
Mota Ana Celia
Steglich Frank
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