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Dresden 2014 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 53: Superconductivity: Fe-based Superconductors - 122

TT 53.10: Talk

Wednesday, April 2, 2014, 12:00–12:15, HSZ 201

Analysis of the sub-dominant d-wave pairing channel in iron-based superconductors — •Thomas Böhm1, Florian Kretzschmar1, Rudi Hackl1, Thomas P. Devereaux2, and Alexander F. Kemper31Walther Meissner Institute, Bavarian Academy of Sciences and Humanities, 85748 Garching, Germany — 2SLAC National Accelerator Laboratory, Stanford Institute for Materials and Energy Sciences, 2575 Sand Hill Road, Menlo Park, California 94025, USA — 3Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA

An analysis of the light scattering spectra of optimally doped Ba0.6K0.4Fe2As2 is presented. On the basis of a realistic band structure as derived from LDA calculations it is shown that the narrow feature found experimentally in the B1g (dx2y2) Raman spectra can be reproduced quantitatively and be identified as a Bardasis-Schrieffer exciton. The theoretical description of the spectra shows that the coupling strength in the subdominant dx2y2 channel is as strong as 60% of that of the dominant s+− channel.

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