Weak phase separation and the pseudogap in the electron-doped cuprates

Weak phase separation and the pseudogap in the electron-doped cuprates

– We study the quantum transition from an antiferromagnet to a superconductor in a model for electronand hole-doped cuprates by means of a variational cluster perturbation theory approach. In both cases, our results suggest a tendency towards phase separation between a mixed antiferromagnetic-superconducting phase at low doping and a pure superconducting phase at larger doping. However, in the ...

Strong- and weak-coupling mechanisms for pseudogap in electron-doped cuprates

Using the two-particle self-consistent approach and cluster perturbation theory for the two-dimensional t-t′-t′′-U Hubbard model, we discuss weakand strong-coupling mechanisms for the pseudogap observed in recent angle resolved photoemission spectroscopy on electron-doped cuprates. In the case of the strong-coupling mechanism, which is more relevant near half-filling, the pseudogap can be mainl...

Nernst effect in the electron-doped cuprates

We calculate the normal state Nernst signal in the cuprates resulting from a reconstruction of the Fermi surface due to spin density wave order. An order parameter consistent with the reconstruction of the Fermi surface detected in electron-doped materials is shown to sharply enhance the Nernst signal close to optimal doping. Within a semiclassical treatment, the obtained magnitude and position...

Electron Doped Cuprates

Pseudogap Phenomena in the Superconducting Phase of the Cuprates

The presence of a normal state spectral (pseudo) gap at the superconducting transition temperature in the underdoped cuprates has important implications for the associated superconducting phase. We argue that this normal state pseudogap derives from pairing fluctuations, which necessarily persist below and which have important implications on the superconducting state. Our Greens function appro...