Cubic lead perovskite PbMoO3 with anomalous metallic behavior

Hiroshi Takatsu, Olivier Hernandez, Wataru Yoshimune, Carmelo Prestipino, Takafumi Yamamoto, Cedric Tassel, Yoji Kobayashi, Dmitry Batuk, Yuki Shibata, Artem M. Abakumov, Craig M. Brown, and Hiroshi Kageyama
Phys. Rev. B 95, 155105 – Published 4 April 2017
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Abstract

A previously unreported Pb-based perovskite PbMoO3 is obtained by high-pressure and high-temperature synthesis. This material crystallizes in the Pm3¯m cubic structure at room temperature, making it distinct from typical Pb-based perovskite oxides with a structural distortion. PbMoO3 exhibits a metallic behavior down to 0.1 K with an unusual T-sublinear dependence of the electrical resistivity. Moreover, a large specific heat is observed at low temperatures accompanied by a peak in CP/T3 around 10 K, in marked contrast to the isostructural metallic system SrMoO3. These transport and thermal properties for PbMoO3, taking into account anomalously large Pb atomic displacements detected through diffraction experiments, are attributed to a low-energy vibrational mode, associated with incoherent off-centering of lone-pair Pb2+ cations. We discuss the unusual behavior of the electrical resistivity in terms of a polaronlike conduction, mediated by the strong coupling between conduction electrons and optical phonons of the local low-energy vibrational mode.

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  • Received 16 December 2016
  • Revised 2 March 2017

DOI:https://doi.org/10.1103/PhysRevB.95.155105

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Hiroshi Takatsu1, Olivier Hernandez2, Wataru Yoshimune1, Carmelo Prestipino2, Takafumi Yamamoto1, Cedric Tassel1, Yoji Kobayashi1, Dmitry Batuk3, Yuki Shibata1, Artem M. Abakumov3,4, Craig M. Brown5, and Hiroshi Kageyama1

  • 1Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
  • 2Institut des Sciences Chimiques de Rennes, UMR CNRS 6226, Université de Rennes 1, Bâtiment 10B, Campus de Beaulieu, Rennes F-35042, France
  • 3EMAT, University of Antwerp, 2020 Antwerpen, Belgium
  • 4Skolkovo Institute of Science and Technology, Nobel straße 3, 143026 Moscow, Russia
  • 5National Institute of Standards and Technology, Center for Neutron Research Gaithersburg, Maryland 20899-6102, USA

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Issue

Vol. 95, Iss. 15 — 15 April 2017

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