Two-band superconductivity featuring different anisotropies in the   ternary iron silicide Lu$_{2}$Fe$_{3}$Si$_{5}$
  We report detailed studies of the upper critical field and low-temperature specific heat in the two-gap superconductor Lu$_{2}$Fe$_{3}$Si$_{5}$. The anisotropy of the upper critical field suggests that the active band is quasi-one-dimensional. Low-temperature specific heat in magnetic fields reveals that the virtual $H_{c2}$ in the passive band is almost isotropic. These results strongly indicate that the two bands have two different anisotropies, similar to the typical two-gap superconductor MgB$_{2}$, and their interplay may be essential to the two-gap superconductivity in Lu$_{2}$Fe$_{3}$Si$_{5}$. 
Y. Nakajima, H. Hidaka, T. Nakagawa, T. Tamegai, T. Nishizaki, T.   Sasaki, N. Kobayashi
cond-mat.supr-con