Hole superconductivity in the electron-doped superconductor PCCO

Details Hole superconductivity in the electron-doped superconductor PCCO Hole superconductivity in the electron-doped superconductor PCCO

2007-06-17

arxiv.org/abs/0706.2471v1

Phys. Rev. B 76, 024506 (2007)

Physics

Condensed Matter

Superconductivity

Accepted in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.76.024506

We measure the resistivity and Hall angle of the electron-doped superconductor Pr_{2-x}Ce_xCuO_4 as a function of doping and temperature. The resistivity Rho_xx at temperatures 100K < T < 300K is mostly sensitive to the electrons. Its temperature behavior is doping independent over a wide doping range and even for non superconducting samples. On the other hand,the transverse resistivity rho_xy, or the Hall angle theta_H where cot(theta_H) = rho_xx/rho_xy, is sensitive to both holes and electrons. Its temperature dependence is strongly influenced by doping, and cot(theta_H) can be used to identify optimum doping (the maximum Tc) even well above the critical temperature. These results lead to a conclusion that in electron doped cuprates holes are responsible for the superconductivity.

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