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Sequential Spin State Transition and Intermetallic Charge Transfer in PbCoO3.

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High pressure induces sequential spin state transitions and charge transfer in lead cobalt oxide (PbCoO3), altering its electrical and structural properties without chemical doping. This study reveals unique material behavior under extreme conditions.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Solid State Chemistry

Background:

  • Spin state transitions and intermetallic charge transfers are key mechanisms for tuning material properties.
  • These phenomena typically occur independently, making sequential observation rare.
  • Perovskite oxides offer a versatile platform for exploring such effects.

Purpose of the Study:

  • To investigate the sequential occurrence of spin state transitions and intermetallic charge transfer in PbCoO3 under high pressure.
  • To understand the impact of these coupled phenomena on the material's structural and electrical properties.
  • To explore novel material phase transitions driven by pressure-induced electronic changes.

Main Methods:

  • High-pressure experiments on PbCoO3.
  • Analysis of spin state changes in cobalt ions.
  • Observation of intermetallic charge transfer between lead and cobalt cations.
  • Measurement of electrical resistance and structural phase transitions.

Main Results:

  • PbCoO3 exhibits a pressure-induced high-spin to low-spin transition for Co2+ up to 15 GPa, increasing resistance.
  • Intermetallic charge transfer between Pb4+ and Co2+ occurs between 15 and 30 GPa.
  • A metal-insulator transition and structural phase transition to a Tetra.-I phase occur around 20 GPa.
  • Further compression above 30 GPa leads to a Tetra.-II phase and reentrant insulating behavior.

Conclusions:

  • Pressure can sequentially induce spin transitions and charge transfer in PbCoO3, demonstrating a novel pathway for property modulation.
  • These coupled electronic and structural changes offer insights into complex phase diagrams of perovskite oxides.
  • The findings highlight the potential for designing materials with tunable properties through external stimuli like high pressure.