Doping asymmetry of superconductivity coexisting with antiferromagnetism in spin fluctuation theory
نویسنده
چکیده
Wegeneralize the theory of Cooper-pairing by spin excitations in themetallic antiferromagnetic state to include situationswith electron and/or hole pockets.We show that Cooper-pairing arises from transverse spinwaves and fromgapped longitudinal spinfluctuations 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 − dx y 2 2-wave state is supported primarily by the longitudinal fluctuations on the electron pockets, and both transverse and longitudinal fluctuations support nodal − dx y 2 2-wave symmetry on the hole pockets. Our resultsmay be relevant to the asymmetry of theAF/SC coexistence state in the cuprate phase diagram.
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Theory of Spin Fluctuation-Induced Superconductivity Based on a d-p Model II —Superconducting State—
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