Hole superconductivity in the electron-doped superconductorPr2−xCexCuO4

Abstract

We measure the resistivity and Hall angle of the electron-doped superconductor Pr2−xCexCuO4 as a function of doping and temperature. The resistivity ρxx 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 ρxy, or the Hall angle θH where cot(θH ) = ρxx/ρxy, is sensitive to both holes and electrons. Its temperature dependence is strongly influenced by doping, and cot(θH) 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.

Terahertz magnetotransport measurements in underdopedPr2−xCexCuO4and comparison with angle-resolved phot

“…2a corresponds to a fractionalized FS slowly recovering to a large hole-like response at high temperature. A similar behavior is observed in the dc R H 15,16,22 and dc cot(θ H ) 25 for similarly underdoped samples in which the response is electron-like at low temperature and gradually decreases in magnitude with increasing temperature.…”

“…A continuing electron-like response with a gradually changing Hall mass is observed well above the Néel temperature, an observation consistent with dc R H measurements. 15,16,25 We interpret this as evidence of current vertex corrections induced by AFM fluctuations in the paramagnetic state. In overdoped PCCO, the current-vertex corrections were shown to successfully describe the salient features of the dc and IR Hall angle measurements as a function of temperature, doping, and frequency.…”

Intermediate coupling model of the cuprates

“…13, as expected, since the nodal gap is present only on the hole-pocket; and, (3) Quantum oscillations (QO) have been observed in NCCO [128], finding a clear nodal pocket at 15% and 16%, and an [From Ref. [126].] Figure 13.…”

“…11, probably closer to the latter. There are three other independent indications of this transition, close to the same doping in NCCO or Pr 2−x Ce x CuO 4 (PCCO): (1) The Hall effect starts to change sign between 14 and 15% doping [126], Fig. 12; (2) The penetration depth crosses over from an exponential temperature dependence to an exponential-plus-linear T -dependence near 14% doping [99,127], Fig.…”

Normal-state Nernst effect in electron-dopedPr2−xCexCuO4−δLi1, Greene2 2007Phys. Rev. BSelf Cite352350View full textAdd to dashboardCite

“…However, this appears to be incompatible with the single large hole pocket seen in ARPES. 21 To explore this further, we look at Stanθ H obtained from the thermopower 39 and the Hall angle measurements, 33 for all the doped PCCO films. As seen in Fig.…”