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. Kemper³ — ¹Walther 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 Ba_0.6K_0.4Fe₂As₂ 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 B_1g (d_x²−y²) 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 d_x²−y² channel is as strong as 60% of that of the dominant s₊₋ channel.