Doping asymmetry of superconductivity coexisting with antiferromagnetism in spin fluctuation theory. (10th February 2015)

• Record Type: Journal Article
• Authors: Rowe, W; Eremin, I; Rømer, A T; Andersen, B M; Hirschfeld, P J
• Is Part Of: New journal of physics. Volume 17:Number 2(2015:Feb.)
• Publication Date: 2015-02-10
• Subjects: superconductivity -- cuprates -- antiferromagnetism; 74.72.Ek -- 75.30.Fv -- 75.10.Lp; Physics -- Periodicals; Physics; Periodicals; 530.05
• DOI: 10.1088/1367-2630/17/2/023022
• Languages: English
• ISSNs: 1367-2630

Abstract

Abstract: We generalize the theory of Cooper-pairing by spin excitations in the metallic antiferromagnetic state to include situations with electron and/or hole pockets. We show that Cooper-pairing arises from transverse spin waves and from gapped longitudinal spin fluctuations of comparable strength. However, each of these interactions, projected on a particular symmetry of the superconducting gap, acts primarily within one type of pocket. We find a nodeless -wave state is supported primarily by the longitudinal fluctuations on the electron pockets, and both transverse and longitudinal fluctuations support nodal -wave symmetry on the hole pockets. Our results may be relevant to the asymmetry of the AF/SC coexistence state in the cuprate phase diagram.