Abstract
The mixed-valent PbRhO undergoes a Verwey-type transition at K, below which the development of Rh/Rh charge order induces an abrupt conductor-to-insulator transition in resistivity. Here we investigate the effect of pressure on the Verwey-type transition of PbRhO 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 PbRhO undergo a reentrant localization under higher pressures. We have constructed a temperature-pressure phase diagram for PbRhO and compared to that of FeO, showing an archetype Verwey transition.
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