Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 3: Complex Oxides: Bulk Properties (joint session TT/HL/MA)

TT 3.3: Vortrag

Montag, 16. März 2020, 10:00–10:15, HSZ 201

Spin Selective Quasi-Particle Interference in PdCoO2 — •Dibyashree Chakraborti1,2, Chi Ming Yim1, Luke Rhodes1, Seunghyun Khim2, Andrew Mackenzie1,2, and Peter Wahl11School of Physics and Astronomy, St. Andrews, Scotland, United Kingdom, KY169SS — 2Max Planck Institute of Chemical Physics of Solids, Noethnitzer Strasse, Dresden -01187

The metallic delafossite PdCoO2, which is among the most conductive oxides currently known (at 295 K) [1], has risen to prominence due to interesting physical effects, such as unusually long mean free paths, leading to hydrodynamic effects being observed in electron flow [2]. Further, recent Angle Resolved Photoemission Spectroscopy (ARPES) studies have reported exciting surface-physics on the CoO2-terminated surface. The CoO2 surface shows evidence of large Rashba spin-splitting, arising from the interplay of energy scales due to strong spin orbit coupling and inversion symmetry breaking at the surface. [3]. In this study, we have identified and investigated the CoO2 termination of PdCoO2 with low temperature Scanning Tunneling Microscopy (STM). We present and discuss the quasi-particle interference imaging of the Rashba spin-split surface state, and the implications for possible spintronics applications.

[1] C.W. Hicks et al., Phys. Rev. Lett. 109, 116401 (2012)

[2] P.J.W. Moll et al., Science 351, 1061 (2016)

[3] V. Sunko et al., Nature 549, 492 (2017)

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