| Title: |
Cubic lead perovskite PbMoO3 with anomalous metallic behavior |
| Authors: |
Takatsu, Hiroshi, Hernandez, Olivier, Yoshimune, Wataru, Prestipino, Carmelo, Yamamoto, Takafumi, Tassel, Cedric, Kobayashi, Yoji, Batuk, Dmitry, Shibata, Yuki, Abakumov, Artem M., Brown, Craig M., Kageyama, Hiroshi |
| Source: |
Phys. Rev. B 95, 155105 (2017) |
| Publication Year: |
2017 |
| Collection: |
Condensed Matter |
| Subject Terms: |
Condensed Matter - Strongly Correlated Electrons, Condensed Matter - Materials Science |
| More Details: |
A previously unreported Pb-based perovskite PbMoO$_3$ is obtained by high-pressure and high-temperature synthesis. This material crystallizes in the $Pm\bar{3}m$ cubic structure at room temperature, making it distinct from typical Pb-based perovskite oxides with a structural distortion. PbMoO$_3$ exhibits a metallic behavior down to 0.1 K with an unusual $T$-sub linear dependence of the electrical resistivity. Moreover, a large specific heat is observed at low temperatures accompanied by a peak in $C_P/T^3$ around 10 K, in marked contrast to the isostructural metallic system SrMoO$_3$. These transport and thermal properties for PbMoO$_3$, 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 Pb$^{2+}$ 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 optical phonons of the local low-energy vibrational mode.
Comment: 5 pages, 5 figures |
| Document Type: |
Working Paper |
| DOI: |
10.1103/PhysRevB.95.155105 |
| Access URL: |
http://arxiv.org/abs/1704.01270 |
| Accession Number: |
edsarx.1704.01270 |
| Database: |
arXiv |
