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Emergence of new physics from interband pairing in pnictide superconductors

Lara Benfatto Centro Studi e Ricerche "Enrico Fermi" and Department of Physics University of Rome "La Sapienza"

One of the most prominent discoveries of the last year is the emergence of
superconductivity in pnictide superconductors. The occurrence of
superconductivity at the border of antiferromagnetism prompted from the
very beginning the analogy with cuprate superconductors, and renewed the hope to find a common superconducting mechanism for the two classes of materials. However, despite such analogy the physics of pnictides reveals marked differences with respect to cuprates, due to the multiband structure. The differences become even more pronounced if one assumes, as many authors have suggested, that pairing has mainly an interband character, as due to exchange of spin fluctuations. Here I will review the work we did recently on multiband superconducting in pnictides, showing that a minimal model requires a four-band structure and a proper theoretical approach to the subtleties of the interband pairing. The results will be compared with recent experiments on ARPES, superfluid density and fluctuation conductivity.

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