Doping and temperature dependence of the superconducting energy gap in the electron-doped cuprate Pr2-xCexCuO4-delta

作者：Diamant I^*; Greene R L; Dagan Y

来源：Physica C-Superconductivity and Its Applications, 2010, 470: S181-S182.

DOI：10.1016/j.physc.2009.10.070

• Carrier density
• Doping profiles
• High temperatures superconductors
• Praseodymium compounds
• Superconducting energy gap
• Tunneling

In hole-doped cuprate superconductors at low carrier concentrations two energy scales are identified: the superconducting energy gap and the pseudogap. The relation between these energy scales is still a puzzle. In these compounds a measurement of the energy gap is not necessarily a probe of the order parameter. In the electron-doped cuprates the pseudogap does not obscure the superconducting state. Consequently, the superconducting gap can be studied directly in a tunneling experiment. Here we show that by studying superconductor/insulator/superconductor planar tunnel junctions we are able to map the behavior of the gap amplitude for the entire (doping-temperature) phase diagram of the electron-doped cuprate superconductor Pr2-xCexCuO4-delta. The superconducting gap, Delta, shows a BCS-like temperature dependence even for extremely low carrier concentrations. Moreover, Delta follows the doping dependence of T-c. We can therefore conclude that there is a single superconducting energy scale in the electron-doped cuprates.

• 出版日期2010-12