ISSN:
1434-6036
Keywords:
PACS. 72.80.-r Conductivity of specific materials - 75.80.+q Magnetomechanical and magnetoelectric effects, magnetostriction - 76.50.+g Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract: We report an investigation of magnetic resonance by ESR in oxygen-doped La2NiO emphasizing extensively for the first time the role of oxygen stoichiometry. The work is performed at room temperature and on powders with . At low field an hysteresis is detected between increasing and decreasing fields, it depends upon . The resonance lines have characteristic features of ferromagnetic resonance. The intensity ( ) is used as an experimental parameter for investigating the effect of . It allows to built a diagram closely connected to the phase diagram . It suggests a ferromagnetic coupling depending upon . When the (average) structure is tetragonal the low intensity is due to a magnetic polaron of low resistivity. In ranges where a phase separation is detected, the ferromagnetic coupling has a structural origin (DM or local anisotropy) with apparently a strong influence on the electrical resistivity.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s100510050269
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