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Nano-magnetic droplets and implications to orbital ordering in La1-xSrxCoO3

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arxiv cond-mat/0512030 v1 pith:ONMLNGZN submitted 2005-12-01 cond-mat.str-el

D. Phelan , Despina Louca , S. Rosenkranz , S.-H. Lee , Y. Qiu , P. J. Chupas , R. Osborn , H. Zheng
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J. F. Mitchell J. R. D. Copley J. L. Sarrao Y. Moritomo
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classification cond-mat.str-el
keywords dropletscorrelationsla1-xsrxcoo3magneticorbitalorderingactivationantiferromagnetic
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Inelastic cold neutron scattering on LaCoO3 provided evidence for a distinct low energy excitation at 0.6 meV coincident with the thermally induced magnetic transition. Coexisting strong ferromagnetic (FM) and weaker antiferromagnetic (AFM) correlations that are dynamic follow the activation to the excited state, identified as the intermediate S=1 spin triplet. This is indicative of dynamical orbital ordering favoring the observed magnetic interactions. With hole doping as in La1-xSrxCoO3, the FM correlations between Co spins become static and isotropically distributed due to the formation of FM droplets. The correlation length and condensation temperature of these droplets increase rapidly with metallicity due to the double exchange mechanism.

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