Pressure-Induced Charge-Order Melting and Reentrant Charge Carrier Localization in the Mixed-Valent Pb3Rh7O15

The mixed-valent Pb3Rh7O15 undergoes a Verwey-type transition at Tv≈180K, below which the development of Rh3＋3＋/Rh4＋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 Pb3Rh7O15 by measuring i...

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Published inChinese physics letters Vol. 34; no. 8; pp. 117 - 120
Main Author 李妍 孙朝 蔡嘉伟 孙建平 王铂森 赵志颖 Y. Uwatoko 闫加强 程金光
Format Journal Article
LanguageEnglish
Published United States IOP Publishing 01.07.2017
Subjects
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
体电阻率
压力诱导
定位
折返
混合价
熔化
电荷有序
电荷载体
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ISSN0256-307X
1741-3540
DOI10.1088/0256-307X/34/8/087201

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Summary:The mixed-valent Pb3Rh7O15 undergoes a Verwey-type transition at Tv≈180K, below which the development of Rh3＋3＋/Rh4＋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 Pb3Rh7O15 by measuring its electrical resistivity under hydrostatic pressures up to 8GPa with a cubic anvil cell apparatus. We find that the application of high pressure can suppress the Verwey-type transition around 3GPa, above which a metallic state is realized at temperatures below ～70K, 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〉7GPa, which indicates that the charge carriers in Pb3Rh7O15 undergo a reentrant localization under higher pressures. We have constructed a temperature-pressure phase diagram for Pb3Rh7O15 and compared to that of Fe3O4, showing an archetype Verwey transition.
Bibliography: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（1.College of Materials Science and Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617;2.Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190;3.Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA;4.Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996, USA;5.The Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan;6.University of Chinese Academy of Sciences, Beijing 100049）
11-1959/O4
The mixed-valent Pb3Rh7O15 undergoes a Verwey-type transition at Tv≈180K, below which the development of Rh3＋3＋/Rh4＋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 Pb3Rh7O15 by measuring its electrical resistivity under hydrostatic pressures up to 8GPa with a cubic anvil cell apparatus. We find that the application of high pressure can suppress the Verwey-type transition around 3GPa, above which a metallic state is realized at temperatures below ～70K, 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〉7GPa, which indicates that the charge carriers in Pb3Rh7O15 undergo a reentrant localization under higher pressures. We have constructed a temperature-pressure phase diagram for Pb3Rh7O15 and compared to that of Fe3O4, showing an archetype Verwey transition.
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
AC05-00OR22725
ISSN:0256-307X
1741-3540
DOI:10.1088/0256-307X/34/8/087201