Magnetic and structural changes in LaCo_0.9Mn_0.1O₃ at high pressure

Area of Science:

• Materials Science
• Condensed Matter Physics
• Solid State Chemistry

Background:

• LaCo$_{0.9}$Mn$_{0.1}$O$_{3}$ is a perovskite oxide with potential applications in magnetic devices.
• Understanding its structural and magnetic behavior under external stimuli like pressure is crucial for material design.

Purpose of the Study:

• To investigate the effect of pressure on the structural and magnetic properties of LaCo$_{0.9}$Mn$_{0.1}$O$_{3}$.
• To determine the bulk modulus and the pressure dependence of the Curie temperature.

Main Methods:

• Neutron powder diffraction was employed to study structural changes under pressure.
• DC magnetometry was used to probe magnetic properties, including the Curie temperature.
• A second-order Birch-Murnaghan equation of state was applied to determine the bulk modulus.

Main Results:

• The material maintains rhombohedral R3c symmetry up to 6 GPa.
• The bulk modulus (B$_{0}$) was determined to be 140(9) GPa.
• A non-linear increase in the Curie temperature (T$_{C}$) was observed, from 224.7 K at ambient pressure to approximately 236 K at 4 GPa.
• The glassy-like nature of the magnetism was confirmed across the studied pressure range.

Conclusions:

• Pressure has a significant effect on the magnetic properties of LaCo$_{0.9}$Mn$_{0.1}$O$_{3}$, particularly its Curie temperature.
• The material's structural integrity and glassy magnetic behavior are robust under applied pressure.
• These findings provide valuable insights for the development of pressure-resilient magnetic materials.