Jump to main content
Jump to site search

Issue 20, 2017
Previous Article Next Article

Metal–insulator transition tuned by magnetic field in Bi1.7V8O16 hollandite

Author affiliations

Abstract

A metal–insulator transition tuned by application of an external magnetic field occurs in the quasi-one dimensional system Bi1.7V8O16, which contains a mix of S = 1 and S = 1/2 vanadium cations. Unlike all other known vanadates, the magnetic susceptibility of Bi1.7V8O16 diverges in its insulating state, although no long-range magnetic ordering is observed from neutron diffraction measurements, possibly due to the frustrated geometry of the triangular ladders. Magnetotransport measurements reveal that the transition temperature is suppressed upon application of an external magnetic field, from 62.5 K at zero field to 40 K at 8 T. This behavior is both hysteretic and anisotropic, suggesting t2g orbital ordering of the V3+ and V4+ cations drives a first-order structural transition. Single crystal X-ray diffraction reveals a charge density wave of Bi3+ cations with a propagation vector of 0.846c*, which runs parallel to the triangular chain direction. Neutron powder diffraction measurements show a first-order structural transition, characterized by the coexistence of two tetragonal phases near the metal–insulator transition. Finally, we discuss the likelihood that ferromagnetic V–V dimers coexist with a majority spin-singlet state below the transition in Bi1.7V8O16.

Graphical abstract: Metal–insulator transition tuned by magnetic field in Bi1.7V8O16 hollandite

Back to tab navigation
Please wait while Download options loads

Supplementary files

Publication details

The article was received on 30 Jan 2017, accepted on 07 May 2017 and first published on 08 May 2017


Article type: Paper
DOI: 10.1039/C7TC00487G
Citation: J. Mater. Chem. C, 2017,5, 4967-4976
  •   Request permissions

    Metal–insulator transition tuned by magnetic field in Bi1.7V8O16 hollandite

    A. M. Larson, B. Wilfong, P. Moetakef, C. M. Brown, P. Zavalij and E. E. Rodriguez, J. Mater. Chem. C, 2017, 5, 4967
    DOI: 10.1039/C7TC00487G

Search articles by author