Influence of Hole Doping on Antiferromagnetic RealSpace Approaches for the HighTc Cuprate.pdf

Influence of Hole Doping on Antiferromagnetic Real-Space Approaches for the High-Tc Cuprates 1 2 3 1 1 Alexander Nazarenko , Stephan Haas , Jose Riera , Adriana Moreo , and Elbio Dagotto 1. Department of Physics, and National High Magnetic Field Lab, Florida State University, Tallahassee, FL 32306, USA 2. Theoretische Physik, Eidgen¨ossische Technische Hochschule, 8093 Z¨urich, Switzerland 3. Instituto de Fisica Rosario, Avda. 27 de Febrero 210 bis, 2000 Rosario, Argentina Recently proposed scenarios for the cuprates make extensive use of a “flat” quasiparticle (q.p.) dispersion and short-range hole-hole interactions in real-space, both caused by antiferromagnetic (AF) correlations. The density of states (DOS) at half-filling has a robust peak which boosts the superconducting critical temperature Tc to large values as holes are introduced into the (rigid) 6 q.p. band. Here, the stability of such scenarios is studied after a finite but small hole density 9 is introduced. The overall conclusion is that the main features of real-space AF-based approaches 9 remain qualitatively similar, namely a large Tc is found and superconductivity (SC) appears in the d 2 2 channel. As the hole density grows the chemical potential crosses a broad peak in the 1 x −y DOS. We also observe that extended s-wave SC competes with d-wa