Abstract
The low-temperature specific heat of electron-doped (n-type) infinite-layer cuprate superconductor Sr0.9La0.1CuO2 was measured. The quasiparticle density of states (DOS) in the mixed state is found to be consistent with the predictions of the s-wave pairing symmetry, and agree very well with the earlier results from tunnelling measurement. This is contrary to the prediction of d-wave symmetry, which has been confirmed for the hole-doped (p-type) cuprates. Our results indicate that the electronic DOS in the mixed state are mainly contributed by the vortex core area in the present sample.