ISSN:
1434-6036
Keywords:
PACS. 76.30.-v Electron paramagnetic resonance and relaxation - 76.50.+g Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance - 75.30.Et Exchange and superexchange interactions
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract: In this work, results of X-band ESR spectroscopy, ac-magnetic susceptibility and X-ray powder diffraction measurements on Li1-xNi 1+x O2 (x = 0.02 and x = 0.07) are presented and discussed. While the susceptibility of the compound with x = 0.02 is shown to follow a Curie-Weiss law, with a Weiss temperature of the order of 30 K, the compound with x = 0.07 is found to order ferromagnetically below K. However, an additional anomaly is observed in the magnetic properties of this latter compound at around 240 K. We attribute this anomaly to the presence of macroscopic Ni-rich regions which order ferrimagnetically below this temperature. This phenomenon is different from the bulk ferromagnetism that occurs at much lower temperatures, and allows us to discard earlier suggestions proposed in the literature in which the 240 K anomaly has been considered as denoting an intrinsic phenomenon.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s100510050109
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