Role of vacancies in metal-insulator transitions of crystalline phase-change materials

Zhang, W.; Wuttig, M.; Zalden, P.; Dederichs, P.H.; Thiess, A.; Blügel, S.; Raty, J-Y.; Zeller, R.; Mazzarello, R.

doi:10.1038/nmat3456

Journal Article

Role of vacancies in metal-insulator transitions of crystalline phase-change materials

Zhang, W. ; Thiess, A.FZJ* ; Zalden, P. ; Zeller, R.FZJ* ; Dederichs, P. H.FZJ* ; Raty, J.-Y. ; Wuttig, M. ; Blügel, S.FZJ* ; Mazzarello, R.

2012
Nature Publishing Group Basingstoke

Nature materials 11, 952 - 956 (2012) [10.1038/nmat3456]

This record in other databases:

Please use a persistent id in citations: http://hdl.handle.net/2128/22941 doi:10.1038/NMAT3456

Abstract: The study of metal-insulator transitions (MITs) in crystalline solids is a subject of paramount importance, both from the fundamental point of view and for its relevance to the transport properties of materials. Recently, a MIT governed by disorder was observed in crystalline phase-change materials. Here we report on calculations employing density functional theory, which identify the microscopic mechanism that localizes the wavefunctions and is driving this transition. We show that, in the insulating phase, the electronic states responsible for charge transport are localized inside regions having large vacancy concentrations. The transition to the metallic state is driven by the dissolution of these vacancy clusters and the formation of ordered vacancy layers. These results provide important insights on controlling the wavefunction localization, which should help to develop conceptually new devices based on multiple resistance states.

Classification: