Eu-Mn Charge Transfer and the Strong Charge-Spin-Electronic Coupling Behavior in EuMnO₃

Area of Science:

• Condensed Matter Physics
• Materials Science
• Computational Materials Science

Background:

• EuMnO3 is a strongly correlated material exhibiting complex interplay between lattice, charge, spin, and electronic properties.
• Understanding the mechanisms of Eu-Mn charge transfer is key to tailoring its functional properties.

Purpose of the Study:

• To investigate the couplings of lattice, charge, spin, and electronic behaviors in EuMnO3.
• To explore the Eu-Mn charge transfer under pressure and its impact on material properties.

Main Methods:

• First-principles calculations using the Density Functional Theory (DFT) + U method.
• Analysis of structural, magnetic, and electronic properties under hydrostatic pressure and external strain.

Main Results:

• Observed a valence transition from Eu3+/Mn3+ to Eu2+/Mn4+ under lattice compression.
• Identified intraplane antiferromagnetism (AFM) of Mn as crucial for Eu2+ emergence.
• Discovered enhanced Mn-Mn ferromagnetic exchange in the Eu2+Mn4+O3 structure, leading to mixed states and versatile electronic structures, including a half-metallic ground state with specific magnetic ordering (CF ordering).

Conclusions:

• Eu-Mn charge transfer is feasible in compressed EuMnO3, driven by coupled charge, spin, and electronic behaviors.
• The Eu 4f states play a significant role in mediating charge and spin interactions, influencing electronic properties.
• The emergence of half-metallic characteristics in specific magnetic configurations highlights potential for novel electronic applications.