Superconductivity in Single-Crystal YIn3
  We measure the superconducting transition of YIn$_3$ by resistivity, susceptibility, and specific heat. Despite using high-quality single-crystal samples, the transitions detected by the three techniques are shifted from each other in temperature, suggesting a region of filamentary superconductivity. We discuss the possible implications for filamentary superconductivity in unconventional superconductors. 
S. D. Johnson, J. R. Young, R. J. Zieve, and J. C. Cooley
cond-mat.supr-con