Pressure-Induced Charge-Order Melting and Reentrant Charge Carrier Localization in the Mixed-Valent Pb_3Rh_7O_15

Yan Li; Zhao Sun; Jia-Wei Cai; Jian-Ping Sun; Bo-Sen Wang; Zhi-Ying Zhao; Y. Uwatoko; Jia-Qiang Yan; Jin-Guang Cheng

doi:10.1088/0256-307X/34/8/087201

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Pressure-Induced Charge-Order Melting and Reentrant Charge Carrier Localization in the Mixed-Valent Pb $_{3}$ Rh $_{7}$ O $_{15}$

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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Funds: 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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Received Date: July 08, 2017

Published Date: July 31, 2017

Abstract

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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Pressure-Induced Charge-Order Melting and Reentrant Charge Carrier Localization in the Mixed-Valent Pb $_{3}$ Rh $_{7}$ O $_{15}$

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Pressure-Induced Charge-Order Melting and Reentrant Charge Carrier Localization in the Mixed-Valent Pb $_{3}$ Rh $_{7}$ O $_{15}$