| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Pressure-Induced Charge-Order Melting and Reentrant Charge Carrier Localization in the Mixed-Valent Pb$_{3}$Rh$_{7}$O$_{15}$ |
| Yan Li1, Zhao Sun1, Jia-Wei Cai1, Jian-Ping Sun2,6, Bo-Sen Wang2,6, Zhi-Ying Zhao3,4, Y. Uwatoko5, Jia-Qiang Yan3, Jin-Guang Cheng2,6** |
1College of Materials Science and Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617
2Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190
3Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
4Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996, USA
5The Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
6University of Chinese Academy of Sciences, Beijing 100049
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| Cite this article: |
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Yan Li, Zhao Sun, Jia-Wei Cai et al 2017 Chin. Phys. Lett. 34 087201 |
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Abstract The mixed-valent Pb$_{3}$Rh$_{7}$O$_{15}$ undergoes a Verwey-type transition at $T_{\rm v} \approx 180$ K, below which the development of Rh$^{3+}$/Rh$^{4+}$ charge order induces an abrupt conductor-to-insulator transition in resistivity. Here we investigate the effect of pressure on the Verwey-type transition of Pb$_{3}$Rh$_{7}$O$_{15}$ by measuring its electrical resistivity under hydrostatic pressures up to 8 GPa with a cubic anvil cell apparatus. We find that the application of high pressure can suppress the Verwey-type transition around 3 GPa, above which a metallic state is realized at temperatures below $\sim $70 K, suggesting the melting of charge order by pressure. Interestingly, the low-temperature metallic region shrinks gradually upon further increasing pressure and disappears completely at $P >7$ GPa, which indicates that the charge carriers in Pb$_{3}$Rh$_{7}$O$_{15}$ undergo a reentrant localization under higher pressures. We have constructed a temperature-pressure phase diagram for Pb$_{3}$Rh$_{7}$O$_{15}$ and compared to that of Fe$_{3}$O$_{4}$, showing an archetype Verwey transition.
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Received: 09 July 2017
Published: 10 July 2017
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| PACS: |
72.80.Ga
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(Transition-metal compounds)
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71.30.+h
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(Metal-insulator transitions and other electronic transitions)
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74.62.Fj
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(Effects of pressure)
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| Fund: Supported by the "Shi-Pei Ji Hua", the National Science Foundation of China under Grant Nos 51402019 and 11574377, the Beijing Natural Science Foundation under Grant No 2152011, the National Basic Research Program of China under Grants No 2014CB921500, the Strategic Priority Research Program and Key Research Program of Frontier Sciences of the Chinese Academy of Sciences under Grant Nos XDB07020100 and QYZDB-SSW-SLH013, the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division, and the CEM, and NSF MRSEC under Grant No DMR-1420451. |
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