Fermi-liquid ground state in n-type copper-oxide superconductor Pr0.91Ce0.09LaCuO4-y
Abstract
We report nuclear magnetic resonance studies on the low-doped n-type copper-oxide Pr0.91Ce0.09LaCuO4-y (T_c=26 K) in the superconducting state and in the normal state uncovered by the application of a strong magnetic field. We find that when the superconductivity is removed, the underlying ground state is the Fermi liquid state. This result is at variance with that inferred from previous thermal expansion measurement and appears to contrast with that in p-type copper-oxides with a similar doping level where high-T_c superconductivity seems to evolve out of a more exotic state. The data in the superconducting state are more consistent with the line-nodes gap model.Keywords
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