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Crystals 2018, 8(2), 81;

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

IMEM-CNR Parco Area delle Scienze 37/A, 43124 Parma, Italy
Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Parco Area delle Scienze 17/A, 43124 Parma, Italy
ISIS Facility, STFC Rutherford Appleton Laboratory, Oxon OX11 0QX, UK
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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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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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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