We report detailed studies of the upper critical field and low-temperature specific heat in the two-gap superconductor Lu2Fe3Si5. 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 Hc2 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 MgB2, and their interplay may be essential to the two-gap superconductivity in Lu2Fe3Si5.
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