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(Hybrid) Seminar: 'Tailoring superconducting properties in intercalated layered chalcogenides' (Lecture)

Friday 26 November 2021Add to my calendar
from 13:30
HG00.616 or via zoom
dr. Machteld Kamminga (Niels Bohr Institute, University of Copenhagen, Denmark)

Machteld KammingaIntercalation/deintercalation chemistry (the reversible insertion of molecules and ions) is often possible in layered compounds. Intercalation is the essential ingredient to batteries and supercapacitors - key energy storage technologies. Furthermore, it is a powerful method for modifying a material’s properties, structure and behaviour. Layered chalcogenide materials often allow for intercalation as a way of tuning the chemistry and physics. Intercalation chemistry of layered chalcogenides such as FeSe is a way of modifying their superconducting properties. As demonstrated by earlier work, the superconducting transition temperature of layered FeSe is remarkably enhanced from ~8.5 K to ~46 K upon intercalation reactions with alkali metals dissolved in liquid ammonia [1]. It was found that the intercalated alkali metals remained solvated by the ammonia which was co-intercalated.

This presentation will consist of two parts: in the first part, the focus will be on the use of in-situ synchrotron X-ray diffraction measurements to provide insight into the intercalation mechanism [1,2,3] and the thermal stability of intercalate phases. This will be exemplified firstly by the complexity in composition and structure of the new superconductors obtained by the intercalation of potassium and ammonia into FeSe, and secondly by the discovery of additional phases obtained by metal/ammonia intercalation into the layered semiconductor Bi2Se3 [3]. The second part will focus on the origin of superconductivity in Bi2Se3 intercalated with Nb [4].

[1] M. Burrard-Lucas, D.G. Free, S.J. Sedlmaier, J.D. Wright, S.J. Cassidy, Y. Hara, A.J. Corkett, T. Lancaster, P.J. Baker, S.J. Blundell, S.J. Clarke, Nature Materials 12, 15-19, (2013).
[2] S.J. Sedlmaier, S.J. Cassidy, R.G. Morris, M. Drakopoulos, C. Reinhard, S.J. Moorhouse, D. O’Hare, P. Manuel, D. Khalyavin, S.J. Clarke, J. Am. Chem. Soc. 136, 630-633 (2014).
[3] M.E. Kamminga, S.J. Cassidy, P. Jana, M. Elgaml, N. Kelly, S.J. Clarke, Dalton Trans. 50, 11376-11379, (2021).
[4] M.E. Kamminga, M. Batuk, J. Haderman, S.J. Clarke, Comms. Mater. 1, 1-7, (2020).

prof. Elias Vlieg

you can find the zoom link in the invitation mail sent on 22-11-2021