Doping effects in single-layered La0.5Sr1.5MnO4 manganite

Area of Science:

• Condensed Matter Physics
• Materials Science
• Solid State Chemistry

Background:

• La(0.5)Sr(1.5)MnO(4) exhibits a charge ordering/orbital ordering ground state.
• Understanding the impact of doping on this ground state is crucial for materials design.

Purpose of the Study:

• To synthesize and characterize pure and B-site doped La(0.5)Sr(1.5)MnO(4) (B = Ru, Co, Ni).
• To investigate the effect of light cation doping on the charge, orbital, and magnetic properties of monolayered manganites.

Main Methods:

• Synthesis of La(0.5)Sr(1.5)Mn(0.95)B(0.05)O(4) samples.
• Structural, transport, and magnetic characterization techniques were employed.
• Analysis of lattice constants, tetragonal distortion, and magnetic ordering.

Main Results:

• Light doping successfully suppressed the charge and orbital order present in pure La(0.5)Sr(1.5)MnO(4).
• No long-range magnetic order was observed in doped samples; instead, a spin-glass state emerged with a freezing temperature around 22 K.
• Structural analysis revealed anisotropy in lattice constants and increasing tetragonal distortion with reduced cell volume.

Conclusions:

• Cation doping is an effective strategy to tune the electronic and magnetic properties of La(0.5)Sr(1.5)MnO(4).
• The observed changes suggest a variation in the orbital character of e(g) electrons due to doping and reduced cell volume.