Volume 122, Number 3, May 2018
|Number of page(s)||7|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||28 June 2018|
New perspectives onto the metal–to–non-metal transition in expanded liquid metals
1 Department of Chemistry, Physical Chemistry, Philipps-University of Marburg - D-35032 Marburg, Germany
2 ISIS Facility, Rutherford Appleton Laboratory - Didcot, OX11 0QX, UK
3 Physics and Geology Department, University of Perugia - Via Pascoli s.n.c., I-06123 Perugia, Italy
4 CNR- IOM, Unità di Perugia c/o Physics and Geology Department, University of Perugia Via Pascoli s.n.c., I-06123 Perugia, Italy
5 Institute Laue Langevin, ILL - 71 avenue des Martyrs - CS 20156 - F-38042 Grenoble Cedex 9, France
6 IOM- CNR, OGG, c/o Institute Laue Langevin, ILL - F-38042 Grenoble, France
Received: 14 February 2018
Accepted: 29 May 2018
The collective dynamics of liquid rubidium was measured by inelastic neutron scattering from melting up to 1673 K and 6.4 MPa to explore an electron gas instability, forecasted by theory at sufficient expansion. Pronounced variations are observed when the predicted conditions are approached. They comply with a scenario for the density-driven metal–to–non-metal transition suggested for fluid mercury where the liquid metal decomposes into a nanoemulsion of metallic and non-metallic domains and the metallic domains constantly disappear with ongoing expansion. Collective modes appear as an unambiguous signature of the metallic phase allowing to directly observe this process.
PACS: 61.05.F- – Neutron diffraction and scattering / 71.30.+h – Metal-insulator transitions and other electronic transitions
© EPLA, 2018
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