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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 Brown, Hiroshi Kageyama


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 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 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.
Physical Review B


Crystal structure, local mode, anharmonic, metallic


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 PbMoO<sub>3</sub> with Anomalous Metallic Behavior, Physical Review B, [online], (Accessed July 16, 2024)


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Created March 31, 2017, Updated October 12, 2021