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

Journal Article · Sat Jul 01 00:00:00 EDT 2017 · Chinese Physics Letters

DOI:https://doi.org/10.1088/0256-307X/34/8/087201· OSTI ID:1399944

Li, Yan ^[1]; Sun, Zhao ^[1]; Cai, Jia -Wei ^[1]; Sun, Jian -Ping ^[2]; Wang, Bo -Sen ^[2]; Zhao, Zhi -Ying ^[3]; Uwatoko, Y. ^[4]; Yan, Jia -Qiang  ^[5]; Cheng, Jin -Guang ^[2]

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1. Beijing Institute of Petrochemical Technology, Beijing (China)
2. Chinese Academy of Sciences (CAS), Beijing (China); Univ. of Chinese Academy of Sciences, Beijing (China)
3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
4. Univ. of Tokyo, Chiba (Japan)
5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Here, 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 ~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.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES)
• Grant/Contract Number: AC05-00OR22725
• OSTI ID: 1399944
• Journal Information: Chinese Physics Letters, Vol. 34, Issue 8; ISSN 0256-307X
• Publisher: IOP Publishing
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY