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We report the results from a thermopower and a Cu nuclear magnetic resonance(NMR) study of the infinite CuO2 layer electron doped high temperaturesuperconducting cuprate (HTSC), Sr0.9La0.1CuO2. We find that the temperaturedependence of the thermopower, S(T), is different from that observed in thehole 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 developedfor the hole doped HTSC and hence S(T) is not anomalous and does not implyphonon mediated pairing as has previously been suggested. The Cu NMR datareveal a Knight shift and spin lattice relaxation rate below Tc that areinconsistent with isotropic s-wave pairing. The Cu spin lattice relaxation ratein the normal state, however, is Curie-Weiss like and is comparable to that ofthe optimally and overdoped hole doped HTSC, La2-xSrxCuO4. The magnitude of theKnight shift indicates that the density of states at the Fermi level isanomalously 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 oflittle importance in the HTSC. We find no evidence of the normal statepseudogap that is observed in the hole doped HTSC and which was recentlyreported to exist in the electron doped HTSC, Nd1.85Ce0.15CuO4, from infraredreflectance measurements.

physical review. b, condensed matter

Gap anisotropy, spin fluctuations, and normal-state properties of the electron-doped superconductor<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>0.9</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">La</mml:mi></mml:mrow><mml:mrow><mml:mn>0.1</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi …

Gap anisotropy, spin fluctuations, and normal-state properties of the electron-doped superconductorSr0.9La0.1