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Vertical position of Sr dopants in the SrxBi2Se3 superconductor

DOI: 10.1103/PhysRevB.104.054506 DOI Help

Authors: You-Ron Lin (Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich; ülich Aachen Research Alliance (JARA); RWTH Aachen University) , Mahasweta Bagchi (University of Cologne) , Serguei Soubatch (Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich; Jülich Aachen Research Alliance (JARA)) , Tien-Lin Lee (Diamond Light Source) , Jens Brede (University of Cologne) , Francois C. Bocquet (Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich; Jülich Aachen Research Alliance (JARA)) , Christian Kumpf (Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich; Jülich Aachen Research Alliance (JARA); RWTH Aachen University) , Yoichi Ando (University of Cologne) , F. Stefan Tautz (Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich; ülich Aachen Research Alliance (JARA); RWTH Aachen University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 104

State: Published (Approved)
Published: August 2021
Diamond Proposal Number(s): 23317

Abstract: The discovery of topological superconductivity in doped Bi 2 Se 3 made this class of materials highly important for the field of condensed matter physics. However, the structural origin of the superconducting state remained elusive, despite being investigated intensively in recent years. We use scanning tunneling microscopy and the normal incidence x-ray standing wave (NIXSW) technique in order to determine the vertical position of the dopants—one of the key parameters for understanding topological superconductivity in this material— for the case of Sr x Bi 2 Se 3 . In particular, we analyze the NIXSW data in consideration of the inelastic mean free path of the photoemitted electrons, which allows us to distinguish between symmetry-equivalent sites. We find that Sr atoms are not situated inside the van der Waals gap between the Bi 2 Se 3 quintuple layers but rather in the quintuple layer close to the outer Se planes.

Journal Keywords: Defects; Dopants; Superconductivity; Scanning tunneling microscopy; X-ray standing waves

Subject Areas: Materials, Physics


Instruments: I09-Surface and Interface Structural Analysis

Added On: 04/10/2021 11:32

Discipline Tags:

Materials Science Quantum Materials Superconductors Physics Hard condensed matter - structures

Technical Tags:

Diffraction Spectroscopy X-ray Standing Wave (XSW) X-ray Photoelectron Spectroscopy (XPS)