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TT: Fachverband Tiefe Temperaturen

TT 36: SC: Fe-based Superconductors - 122 - Properties, Electronic Structure, Mechanisms

TT 36.13: Vortrag

Mittwoch, 16. März 2011, 17:30–17:45, HSZ 304

Unconventional Raman scattering in the line node superconductor BaFe₂(As_1−xP_x)₂ — •Peter Lemmens¹, Vladimir Gnezdilov^1,2, Yurii Pashkevich³, Sergei Gnatchenko², Shiregu Kasahara⁴, and Yuji Matsuda⁴ — ¹IPKM, TU-BS, Braunschweig, Germany — ²ILTPE NAS, Ukraine — ³DonFTI NAS, Ukraine — ⁴Dep. of Phys., Kyoto University, Japan

The phase diagram of the system BaFe₂(As_1−xP_x)₂ is probed using Raman scattering. We observe a breakdown of selection rules and a pronounced effect of the folding back of the energy versus wave vector of dispersion curves in the non-Fermi liquid regime. This behavior contrasts with the observation of quantum oscillations in magneto transport. Possible mechanisms of such unexpected behavior are discussed.

Work supported by DFG.