Istituto dei materiali per l'elettronica ed il magnetismo     
De Renzi R., Allodi G., Fanesi S., Guidi G., Licci F., Hennion M., Pinsard L. Influence of charge carriers on magnetic order in lightly doped manganites, detected by μSR: Evidence for a superparamagnetic transition to the antiferromagnetic state. In: Applied Magnetic Resonance, vol. 19 (3-4) pp. 421 - 430. Springer-Verlag, 2000.
We detected two spontaneous precession frequencies in antiferromagnetic pure LaMnO3, the end member of different families of charge-doped manganites. The muon site and local field orientation are identified for one frequency, which provides a measure of the staggered magnetization. We present additional zero and longitudinal field muon relaxation data on an LaMnO3.045 sample in which a new regime appears above an intermediate temperature T*, where regions of magnetic order coexist with domains of fluctuating moments. These results are discussed in terms of nucleation of the ordered phase in a superparamagnetic matrix.
URL: http://www.springerlink.com/content/0937-9347
DOI: 401TK
Subject Physics, Atomic, Molecular & Chemical; Spectroscopy

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