Cubic Lead Perovskite PbMoO3 with Anomalous Metallic Behavior

Published

April 1, 2017

Author(s)

Hiroshi Takatsu, Olivier Hernandez, Wataru Yoshimune, Carmelo Prestipino, Takafumi Yamamoto, Cedric Tassel, Yoji Kobayashi, Dmitry Batuk, Yuki Shibata, Artem M. Abakumov, Craig Brown, Hiroshi Kageyama

Abstract

A novel Pb-based perovskite PbMoO₃ is obtained by high-pressure and high-temperature synthesis. This material crystallizes in the Pm3m 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 Τ-sub linear dependence of the electrical resistivity. Moreover, a large specific heat is observed at low temperatures accompanied by a peak in C_P /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 phonon mode, associated with incoherent off-centering of lone pair Pb²⁺ cations. We discuss the unusual behavior of the electrical resistivity in terms of a polaron-like conduction, mediated by the strong coupling between conduction electrons and low-energy phonons.

Citation

Physical Review B

Volume

95

Issue

15

Pub Type

Journals

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Keywords

Crystal structure, local mode, anharmonic, metallic

Citation

Takatsu, H. , Hernandez, O. , Yoshimune, W. , Prestipino, C. , Yamamoto, T. , Tassel, C. , Kobayashi, Y. , Batuk, D. , Shibata, Y. , Abakumov, A. , Brown, C. and Kageyama, H. (2017), Cubic Lead Perovskite PbMoO₃ with Anomalous Metallic Behavior, Physical Review B, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=922528 (Accessed October 11, 2024)