  We report the results from a thermopower and a Cu nuclear magnetic resonance
(NMR) study of the infinite CuO2 layer electron doped high temperature
superconducting cuprate (HTSC), Sr0.9La0.1CuO2. We find that the temperature
dependence of the thermopower, S(T), is different from that observed in the
hole doped HTSC. In particular, we find that dS(T)/dT is positive above ~120 K.
However, we show that S(T) can still be described by the same model developed
for the hole doped HTSC and hence S(T) is not anomalous and does not imply
phonon mediated pairing as has previously been suggested. The Cu NMR data
reveal a Knight shift and spin lattice relaxation rate below Tc that are
inconsistent with isotropic s-wave pairing. The Cu spin lattice relaxation rate
in the normal state, however, is Curie-Weiss like and is comparable to that of
the optimally and overdoped hole doped HTSC, La2-xSrxCuO4. The magnitude of the
Knight shift indicates that the density of states at the Fermi level is
anomalously small when compared with the hole doped HTSC with the same Tc,
indicating that the size of the density of states at the Fermi level is of
little importance in the HTSC. We find no evidence of the normal state
pseudogap that is observed in the hole doped HTSC and which was recently
reported to exist in the electron doped HTSC, Nd1.85Ce0.15CuO4, from infrared
reflectance measurements.
