Universität zu Köln

Verbitskiy, N. I., Fedorov, A. V., Tresca, C., Profeta, G., Petaccia, L., Senkovskiy, B. V., Usachov, D. Yu, Vyalikh, D. V., Yashina, L. V., Eliseev, A. A., Pichler, T. and Grueneis, A. (2016). Environmental control of electron-phonon coupling in barium doped graphene. 2D Mater., 3 (4). BRISTOL: IOP PUBLISHING LTD. ISSN 2053-1583

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Abstract

Two-dimensional superconductivity in alkali-and alkaline-Earth-metal doped monolayer graphene has been explained in the framework of electron-phonon coupling (EPC) and experiments yielded superconducting transition temperatures (TC) up to 6 K. In contrast to bulk graphite intercalation compounds, the interface of doped graphene with its environment affects its physical properties. Here we present a novel and well-defined BaC8 interface structure in Ba-doped single-layer graphene on Au and Ge substrates. We use angle-resolved photoemission spectroscopy in combination with ab initio modelling to extract the Eliashberg function and EPC for both substrates. This allows us to quantitatively assess the environmental effects for both Au and Ge substrates on superconductivity in graphene. We show that for semiconducting Ge substrates, the doping level and EPC are higher. Our study highlights that both dopant order and the metallicity of the substrate can be used to control EPC and hence superconductivity.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Verbitskiy, N. I. UNSPECIFIED UNSPECIFIED UNSPECIFIED Fedorov, A. V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Tresca, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Profeta, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Petaccia, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Senkovskiy, B. V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Usachov, D. Yu UNSPECIFIED UNSPECIFIED UNSPECIFIED Vyalikh, D. V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Yashina, L. V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Eliseev, A. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pichler, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Grueneis, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-255289
DOI:	10.1088/2053-1583/3/4/045003
Journal or Publication Title:	2D Mater.
Volume:	3
Number:	4
Date:	2016
Publisher:	IOP PUBLISHING LTD
Place of Publication:	BRISTOL
ISSN:	2053-1583
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language TOTAL-ENERGY CALCULATIONS; BILAYER GRAPHENE; SUPERCONDUCTIVITY; INTERCALATION Multiple languages Materials Science, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/25528