Phys. Rev. B 58, 9385–9389 (1998)Evidence of charge carrier interaction above Tc in the Nd1.85Ce0.15CuO4+δ superconductorReceived 27 March 1998; published in the issue dated 1 October 1998 Resistivity, thermopower, and magnetic susceptibility of the Nd1.85Ce0.15CuO4+δ n-type superconductor have been measured on samples with well-known charge carrier density. Superconductivity is achieved only for charge carrier densities greater than a threshold value. When this value is approached, mobility drops to less than a tenth of the value for nonsuperconducting samples, the effective mass increases from 8me to 25me, and susceptibility falls to lower values. All these phenomena are apparent well above Tc, thus indicating a charge carrier interaction above Tc. © 1998 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.58.9385
DOI:
10.1103/PhysRevB.58.9385
PACS:
74.25.Fy, 74.25.Ha, 74.72.Jt
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