Possible pseudogap behavior of electron doped high-temperature superconductors

Details Possible pseudogap behavior of electron doped high-temperature superconductors Possible pseudogap behavior of electron doped high-temperature superconductors

2001-01-29

arxiv.org/abs/cond-mat/0101433v1

Physics

Condensed Matter

Superconductivity

4 pages, 4 ps-figures included, to be published in Phys. Rev. B, Rapid Comm

Scientific paper

10.1103/PhysRevB.63.100507

We have measured the low-energy quasiparticle excitation spectrum of the electron doped high-temperature superconductors (HTS) Nd(1.85)Ce(0.15)CuO(4-y) and Pr(1.85)Ce(0.15)CuO(4-y) as a function of temperature and applied magnetic field using tunneling spectroscopy. At zero magnetic field, for these optimum doped samples no excitation gap is observed in the tunneling spectra above the transition temperature Tc. In contrast, below Tc for applied magnetic fields well above the resistively determined upper critical field, a clear excitation gap at the Fermi level is found which is comparable to the superconducting energy gap below Tc. Possible interpretations of this observation are the existence of a normal state pseudogap in the electron doped HTS or the existence of a spatially non-uniform superconducting state.

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