Evolution of the electronic transport properties of V6O11 and V7O13 under pressure

S. K. Kim, E. Colombier, N. Ni, S. L. Bud'ko, and P. C. Canfield
Phys. Rev. B 87, 115140 – Published 27 March 2013

Abstract

V6O11 and V7O13 are two members of the VnO2n1 Magnéli series (n=39). At ambient pressure, V6O11 manifests a metal to insulator (MI) transition near TMI=170 K and V7O13 (the exception in the series that does not become insulating at ambient pressure) manifests an antiferromagnetic (AFM) transition with spin density wave character at TN=43 K. Temperature-dependent resistivity data for V6O11 and V7O13 were measured under pressures up to 7.52 and 6.40 GPa, respectively with critical pressures of PcMI=3.8 GPa for V6O11 and PcAFM=3.5 GPa for V7O13. As the MI transition for V6O11 is suppressed no features associated with an AFM transition in the resistivity are seen. Near the critical pressure for V6O11 where the first-order MI transition disappears, a T2 dependence of the low-temperature resistance can be found. On the other hand, in V7O13 as the second-order, antiferromagnetic transition is brought towards T=0, the resistivity shows a vanishing low-temperature region of Fermi-liquid-like behavior, consistent with proximity to a quantum critical point. Improved hydrostaticity of the pressurized sample space enhances the divergence of the T2 coefficient for V7O13 near the AFM critical pressure, 3.5 GPa.

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  • Received 17 December 2012

DOI:https://doi.org/10.1103/PhysRevB.87.115140

©2013 American Physical Society

Authors & Affiliations

S. K. Kim1,2, E. Colombier1,*, N. Ni1,2,†, S. L. Bud'ko1,2, and P. C. Canfield1,2

  • 1Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA
  • 2Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA

  • *Present address: Alstom Grid, 69100 Villeurbanne, France.
  • Present address: Los Alamos National Laboratory, Los Alamos, New Mexico 87544, USA.

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Vol. 87, Iss. 11 — 15 March 2013

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