Journal
PHYSICAL REVIEW B
Volume 78, Issue 21, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.78.212301
Keywords
barium compounds; colossal magnetoresistance; ferromagnetic materials; ferromagnetic-paramagnetic transitions; lanthanum compounds; magnetic polarons; neutron diffraction; strontium compounds
Funding
- BRFFI [F-08R-177]
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The nature of the polarons in the optimally doped colossal magnetoresistive materials La0.7Ba0.3MnO3 (LBMO) and La0.7Sr0.3MnO3 (LSMO) is studied by elastic and inelastic neutron scattering. In both materials, dynamic nanoscale polaron correlations develop abruptly in the ferromagnetic state. However, the polarons are not able to lock-in to the lattice and order, in contrast to the behavior of La0.7Ca0.3MnO3. Therefore ferromagnetic order in LBMO and LSMO survives their formation, explaining the conventional second-order nature of the ferromagnetic-paramagnetic transition. Nevertheless, the results demonstrate that the fundamental mechanism of polaron formation is a universal feature of these ferromagnetic perovskite manganites.
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