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TT: Fachverband Tiefe Temperaturen

TT 49: Poster Session: Superconductivity

TT 49.5: Poster

Mittwoch, 3. April 2019, 15:00–18:30, Poster D

Mapping the nematic axis of Cu_xBi₂Se₃ at high doping — •Mahasweta Bagchi, Jens Brede, Jeison Fischer, Thomas Michely, and Yoichi Ando — Physics Institute II, University of Cologne, Germany

Recently, NMR Knight-shift measurements[1] and measurements of angular dependent specific heat in a magnetic field[2] show spontaneous symmetry breaking in the superconducting state of bulk samples of Cu_xBi₂Se₃. Both observations firmly establish an odd parity nematic superconducting state in Cu_xBi₂Se₃. More recently, STM experiments[3] demonstrated mapping of the elongation of the vortex core in the vortex state of Cu_xBi₂Se₃ under an applied magnetic field. The orientation of the vortex core with respect to the crystallographic axis of the sample, as inferred from atomic-resolution images, gives the orientation of the nematic axis.

Here, we study Cu_xBi₂Se₃ with varying x. In particular, we study samples near optimum doping (x=0.3) and at higher doping levels (x=0.6) with an STM operated at 350 mK and under applied magnetic field and determine the nematic axis as a function of x.
K. Matano et al., Nat. Phys. 12(9) 852 (2016)
S. Yonezawa et al., Nat. Phys. 13(2) 123 (2017)
R. Tao et al., Phys. Rev. X 8(4) 041024 (2018)