J(eff)=1/2 Mott-insulating state in Rh and Ir fluorides

Area of Science:

• Condensed Matter Physics
• Materials Science
• Quantum Chemistry

Background:

• Understanding emergent phenomena in transition metal compounds requires exploring the interplay of large spin-orbit coupling and strong electron-electron correlation.
• Identifying new materials that host these competing interactions is crucial for advancing condensed matter physics.
• Previous research has synthesized fluoride compounds, but their electronic properties related to spin-orbit coupling and correlation remain underexplored.

Purpose of the Study:

• To predict a novel class of J_{eff}=1/2 Mott insulators within a family of fluoride compounds.
• To investigate the coexistence of large spin-orbit coupling and strong electron-electron correlation in these materials.
• To explore the potential of these compounds for realizing exotic quantum phenomena.

Main Methods:

• Employed first-principles calculations using all-electron density functional theory (DFT) combined with dynamical mean-field theory (DMFT).
• Calculated electronic structures and correlated properties of the target fluoride compounds.
• Assessed the magnitude of Mott gaps and proximity to the ideal J_{eff}=1/2 limit.

Main Results:

• Predicted a novel class of J_{eff}=1/2 Mott insulators in previously synthesized fluoride compounds.
• Calculations revealed large Mott gaps, indicating strong electron correlation effects.
• Several compounds demonstrated remarkable proximity to the ideal, SU(2) symmetric J_{eff}=1/2 state.

Conclusions:

• The identified fluoride compounds represent promising candidates for studying the physics of strong spin-orbit coupling and electron correlation.
• These materials offer a new platform for exploring emergent quantum phenomena driven by the interplay of these interactions.
• Further experimental characterization is warranted to confirm the predicted electronic properties and quantum behavior.