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SFB1238 | Katharina Franke

On 18 March at 14:30 - 16:00 in Seminar Room of the Institute of Physics II

Katharina Franke, Freie Universität Berlin

 

Yu-Shiba-Rusinov states of individual magnetic atoms on 3D and quasi-2D superconductors

 

Magnetic impurities in conventional superconductors induce a pair-breaking potential, which leads

to bound states inside the superconducting energy gap. These states are called Yu-Shiba-Rusinov

states, or short: Shiba states, and can be probed by scanning tunneling spectroscopy at the atomic

scale.

Here, we explore the Shiba states of individual magnetic atoms on superconducting substrates. The

patterns of Shiba states of individual Mn atoms on a Pb(100) surface exhibit the shape of the

corresponding spin-carrying d-orbital [1]. When the adatoms are brought into sufficiently close

distance, they hybridize by forming symmetric and anti-symmetric linear combinations of the Shiba

wave functions [2].

NbSe2 is a van der Waals-layered material with quasi-2D character. In addition to its superconducting

properties it hosts a charge-density wave (CDW) at low temperatures. Magnetic atoms and

molecules have been shown to give rise to long-range oscillatory Shiba states [3,4]. Here, we show

that the CDW affects the energy and symmetry patterns of Shiba states around individual Fe atoms.

[1] M. Ruby, Y. Peng, F. von Oppen, B.W. Heinrich, K.J. Franke, Phys. Rev. Lett. 117, 186801 (2016)

[2] M. Ruby, B.W. Heinrich, Y. Peng, F. von Oppen, K.J. Franke, Phys. Rev. Lett. 120, 156803 (2018)

[3] G. Menard, et al, Nat. Phys. 11, 1013 (2015)

[4] S. Kezilebieke, M. Dvorak, T. Ojanen, P. Liljeroth, Nano Lett. 18, 2311 (2018)

 

Contact Person: Yoichi Ando