Mondal, Parthasarathi and Bhattacharya, Dipten and Maity, Anwesha and Chakrabarti, Omprakash and Islam, A K M Maidul and Mukherjee, Manabendra (2011) Evolution of orbital phases with particle size in nanoscale stoichiometric LaMnO(3). Journal of Applied Physics, 109 (8). Article No:- 084327 . ISSN 0021-8979

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The thermodynamically stable long-range orbital order in bulk LaMnO(3) becomes metastable at nanoscale around a critical particle size d(C) similar to 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 similar to 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 similar to 10 nm), the structure becomes cubic (space group Pm (3) over barm). 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 similar to 10 nm to bulk for stoichiometric LaMnO(3). (C) 2011 American Institute of Physics. [doi:10.1063/1.3561365]

Item Type: Article
Subjects: Electronics
Divisions: Nano-Structured Materials
Depositing User: Bidhan Chaudhuri
Date Deposited: 16 Jan 2012 12:09
Last Modified: 01 Nov 2013 11:59

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