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TT: Fachverband Tiefe Temperaturen

TT 46: Superconductivity: Fe-based Superconductors - FeSe

TT 46.1: Talk

Wednesday, March 9, 2016, 10:00–10:15, H19

Superconductivity and electronic structure in single-layer FeSe on SrTiO₃ probed by scanning tunneling microscopy — •Jasmin Jandke¹, Jonas Dressner¹, Fang Yang², Chunlei Gao², and Wulf Wulfhekel¹ — ¹Physikalisches Institut, Karlsruhe Institut of Technology, Germany — ²Fudan Universität, Shanghai , China

We use high-resoluion scanning tunneling spectroscopy (STS) to study single-layer FeSe on Nb-doped SrTiO₃ (001). Features of bosonic excitations were observed in the measured quasiparticle density of states. Furthermore, using STS, quasiparticle interference (QPI) imaging was performed in order to map the multiband electronic structure of FeSe. Compared to previous measurements [1,2], an additional feature is visible in our measured QPI maps on a single-layer FeSe/SrTiO₃ . The origin of this feature will be discussed.

[1] D. Huang et al. PRL 115, 017002 (2015)

[2] Q. Fan et al. arXiv:1504.02185 [cond-mat.supr-con] (2015)