Universität zu Köln

Lin, You-Ron ORCID: 0000-0002-1759-7419, Bagchi, Mahasweta ORCID: 0000-0002-0031-0952, Soubatch, Serguei, Lee, Tien-Lin, Brede, Jens ORCID: 0000-0002-4946-8160, Bocquet, Francois C., Kumpf, Christian ORCID: 0000-0003-3567-5377, Ando, Yoichi ORCID: 0000-0002-3553-3355 and Tautz, F. Stefan (2021). Vertical position of Sr dopants in the SrxBi2Se3 superconductor. Phys. Rev. B, 104 (5). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

The discovery of topological superconductivity in doped Bi2Se3 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 SrxBi2Se3. 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 Bi2Se3 quintuple layers but rather in the quintuple layer close to the outer Se planes.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Lin, You-Ron UNSPECIFIED orcid.org/0000-0002-1759-7419 UNSPECIFIED Bagchi, Mahasweta UNSPECIFIED orcid.org/0000-0002-0031-0952 UNSPECIFIED Soubatch, Serguei UNSPECIFIED UNSPECIFIED UNSPECIFIED Lee, Tien-Lin UNSPECIFIED UNSPECIFIED UNSPECIFIED Brede, Jens UNSPECIFIED orcid.org/0000-0002-4946-8160 UNSPECIFIED Bocquet, Francois C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kumpf, Christian UNSPECIFIED orcid.org/0000-0003-3567-5377 UNSPECIFIED Ando, Yoichi UNSPECIFIED orcid.org/0000-0002-3553-3355 UNSPECIFIED Tautz, F. Stefan UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-590328
DOI:	10.1103/PhysRevB.104.054506
Journal or Publication Title:	Phys. Rev. B
Volume:	104
Number:	5
Date:	2021
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2469-9969
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SURFACE-STRUCTURE DETERMINATION; PHOTOELECTRON EMISSION; RAY Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/59032