Pressure-Dependent Colossal Resistivity and Anomalous Optical Signatures in FeSbO4

Partha Pratim Das, Sudeshna Samanta, Sangita Das, Ratnadwip Singha, Thomas Vogt, Yongjae Lee

Research output: Contribution to journalArticlepeer-review

Abstract

FeSbO4exhibits an extraordinarily high electrical resistance of ∼650 Gω at pressures near 7 GPa at room temperature. Pressure-induced electrical transport measurements reveal a large resistance increase of 106compared to ambient pressure. This is the result of a very strong Coulomb repulsion between localized iron 3d-electrons caused by an abrupt shortening of the axial Fe(3d)/Sb(5s)-O(2p) σ-bonds in the Fe/SbO6octahedra as verified by in situ X-ray diffraction (XRD) study. Subsequent and concomitant strengthening of Sb-O and weakening of Fe-O bonds drive FeSbO4into a Mott insulating state. Upon increasing pressure to 13 GPa, XRD and optical absorption spectroscopy further confirm a first-order phase transition from a tetragonal insulator with Fe3+in a high spin state to an orthorhombic semiconductor with Fe3+in a low spin state without any metallization. Powder diffraction and transmission electron microscope images reveal that the recovered sample after pressure release preserves the high-pressure orthorhombic structure albeit with Fe3+in a high spin state and maintains its high resistance. The behavior at moderate pressures might be useful for potential applications in electronic switches, piezoresistive sensors, and other electronic devices.

Original languageEnglish
Pages (from-to)7630-7637
Number of pages8
JournalJournal of Physical Chemistry C
Volume126
Issue number17
DOIs
Publication statusPublished - 2022 May 5

Bibliographical note

Funding Information:
This work was supported by the Leader Researcher program (Grant NRF-2018R1A3B1052042) of the Korean Ministry of Science, ICT and Planning (MSIP).

Publisher Copyright:
© 2022 American Chemical Society. All rights reserved.

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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