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Crystals 2018, 8(2), 81; doi:10.3390/cryst8020081

High Pressure Induced Insulator-to-Semimetal Transition through Intersite Charge Transfer in NaMn7O12

1
IMEM-CNR Parco Area delle Scienze 37/A, 43124 Parma, Italy
2
Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Parco Area delle Scienze 17/A, 43124 Parma, Italy
3
ISIS Facility, STFC Rutherford Appleton Laboratory, Oxon OX11 0QX, UK
4
School of Physics and Astronomy, Tel-Aviv University, Tel-Aviv 69978, Israel
*
Author to whom correspondence should be addressed.
Received: 11 January 2018 / Revised: 30 January 2018 / Accepted: 31 January 2018 / Published: 3 February 2018
(This article belongs to the Special Issue Non-Ambient Crystallography)
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Abstract

The pressure-dependent behaviour of NaMn7O12 (up to 40 GPa) is studied and discussed by means of single-crystal X-ray diffraction and resistance measurements carried out on powdered samples. A transition from thermally activated transport mechanism to semimetal takes place above 18 GPa, accompanied by a change in the compressibility of the system. On the other hand, the crystallographic determinations rule out a symmetry change to be at the origin of the transition, despite all the structural parameters pointing to a symmetrizing effect of pressure. Bond valence sum calculations indicate a charge transfer from the octahedrally coordinated manganese ions to the square planar ones, likely favouring the delocalization of the carriers. View Full-Text
Keywords: strongly correlated systems; high pressure; charge ordering; MIT strongly correlated systems; high pressure; charge ordering; MIT
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Delmonte, D.; Mezzadri, F.; Orlandi, F.; Calestani, G.; Amiel, Y.; Gilioli, E. High Pressure Induced Insulator-to-Semimetal Transition through Intersite Charge Transfer in NaMn7O12. Crystals 2018, 8, 81.

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