  Temperature and magnetic field dependent specific heat of textured Sc5Ir4Si10
superconductor was investigated in detail. Based on the fitting of zero-field
electronic specific heat by different gap structures as well as the discussion
on field-induced specific heat coefficient, Sc5Ir4Si10 is proved to be an
anisotropic s-wave superconductor with a gap anisotropy of 0.53. The anisotropy
of upper critical field suggests the weakly one-dimensional Fermi surface, and
the value is consistent with the gap anisotropy result obtained from the
specific heat data.
