Temperature-Pressure Phase Diagram and Possible Pressure-Driven New Electronic Phase in the Polar Metal LiOsO₃

Abstract

LiOsO3 is a strongly correlated metal that undergoes a nonpolar to polar transition at the critical temperature (Ts) of 140 K. Complementary to previous studies of structure, Raman, and resistivity under high pressure (P), here we map out a complete pressure evolution of Ts(P) via high-pressure resistance measurements up to 18.5 GPa by using a low-temperature multianvil apparatus. Our results show that Ts(P) first increases linearly with pressure at a large slope as reported and then levels off gradually at pressures above 10 GPa when approaching room temperature (295 K). Interestingly, we find that the resistance R(T) of LiOsO3 at 18.5 GPa in the polar R3c phase exhibits a distinct temperature profile in comparison with those at lower pressures, signaling the possible occurrence of pressure-driven new electronic phase. The critical pressure for this transition is determined to be Pc = 16.8(1) GPa based on the pressure-dependent resistance measurement at room temperature.

A strain induced polar metal phase in a ferromagnetic Fe3GeTe2 monolayer

“…Other schemes have also been developed to introduce polarization in ferromagnetism such as forming an asymmetric Janus structure, 12 vacancy tailored electric polarization in a ferromagnet, 13 doping magnetic transition metals in ferroelectricity, 14 intercalation induced switchable polarization in a magnet, 15 etc. On the other hand, some polar metals which accommodate electric polarization and conductivity simultaneously are also evidenced in experiments, i.e., the displacive transition in LiOsO 3 16 and interlayer sliding in WTe 2 . 17,18 More interestingly, a novel design framework is obtained by the removal of inversion symmetry through the displacement of atoms whose electronic degrees of freedom are decoupled from the states at the Fermi level.…”

“…On the other hand, some polar metals which accommodate electric polarization and conductivity simultaneously are also evidenced in experiments, i.e. , the displacive transition in LiOsO 3 16 and interlayer sliding in WTe 2 . 17,18 More interestingly, a novel design framework is obtained by the removal of inversion symmetry through the displacement of atoms whose electronic degrees of freedom are decoupled from the states at the Fermi level.…”

From Fundamentals to Next-Generation Technology - JES/JSS Focus Issue In Honor of John Goodenough: A Centenarian Milestone

“…The second category of stabilization of unique electronic states and phases is represented by Hong et al 16 presentation of the novel NiFe 3 O 5 compound exhibiting multiple magnetic transitions that are influenced by frustration of exchange interactions and by Cheng et al 17 who describe the impact of pressure and temperature on electronic phase transitions in the polar metallic compound LiOsO 3 . In a more retrospective contribution, Coey, Givord, and Fruchart 18 review the interesting series of magnetic phase transformations and associated functional effects in the metallic nitride and carbide perovskites and suggest that a revisit of this class of materials may yield new types of phenomena and applications.…”