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CPM Seminar
Theory of High Temperature Superconductivity John Berlinsky McMaster University Zhang's SO(5) theory provides and elegant framework for understanding the interplay of antiferromagnetism and d-wave superconductivity in the high Tc suprates. It also makes a number of predictions which can be tested experimentally. This talk will describe two such predictions: (1) the occurrence of antiferromagnetic vortex cores in under-doped materials and (2) the possibility of constructing heterostructures, such as S-A-S sandwiches, in which the presence of strong S outer layers "rotates" the A region into the superconducting direction. Such a heterostructure is predicted to undergo a Freederickxz-like transition (analogous to a nematic liquid crystal confined between two anchoring glass sheets in a perpendicular field) as a function of A-layer thickness and of applied supercurrent.
Thursday, October 23rd, 15:30 |