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Regensburg 2019 – wissenschaftliches Programm

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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 CuxBi2Se3 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 CuxBi2Se3. Both observations firmly establish an odd parity nematic superconducting state in CuxBi2Se3. More recently, STM experiments[3] demonstrated mapping of the elongation of the vortex core in the vortex state of CuxBi2Se3 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 CuxBi2Se3 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)

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