Evolution of orbital phases with particle size in nanoscale stoichiometric LaMnO3

Details Evolution of orbital phases with particle size in nanoscale stoichiometric LaMnO3 Evolution of orbital phases with particle size in nanoscale stoichiometric LaMnO3

2009-04-24

arxiv.org/abs/0904.3878v3

J. Appl. Phys. 109, 084327 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

revised following referees' comments, accepted for publicaton in J. Appl. Phys

Scientific paper

10.1063/1.3561365

The thermodynamically stable long-range orbital order in bulk LaMnO3 becomes metastable at nanoscale around a critical particle size d_C~20 nm. The orbital order-disorder transition switches from reversible to irreversible at d_C while the resistance in the orbital ordered state decays by 2-4% over a time scale of ~3000s. At well below d_C, of course, a stable orbital disordered phase emerges. The orthorhombic distortion of the underlying crystallographic structure (space group Pbnm) decreases systematically with the decrease in particle size and at far below d_C (e.g., at ~10 nm), the structure becomes cubic (space group Pm-3m). Using the crystallographic and electrical resistance data, a phase diagram has been constructed showing the evolution of different orbital phases as a function of particle size across ~10 nm to bulk for stoichiometric LaMnO3.

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