Doping asymmetry of superconductivity coexisting with antiferromagnetism in spin fluctuation theory

• Published in: New journal of physics Vol. 17; no. 2; pp. 23022 - 9
• Main Authors: Rowe, W, Eremin, I, Rømer, A T, Andersen, B M, Hirschfeld, P J
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 10-02-2015
• Subjects: 74.72.Ek; 75.10.Lp; 75.30.Fv; Antiferromagnetism; Asymmetry; COPPER OXIDE; cuprates; DOPING; ELECTRICAL CONDUCTIVITY; Electrons; Fluctuation; Fluctuation theory; MAGNETIC PROPERTIES; Magnons; Phase diagrams; Physics; Pocket; Spin waves; SUPERCONDUCTIVITY; Symmetry
• ISSN: 1367-2630; 1367-2630
• DOI: 10.1088/1367-2630/17/2/023022

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.