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Title: Critical behavior and the absence of glass state in ferromagnetic La0.7Ca0.3CoO3 nanowires
Authors: Wang, Yang
Fan, Hong Jin
Issue Date: 2011
Source: Wang, Y., & Fan, H. J. (2012). Critical behavior and the absence of glass state in ferromagnetic La0.7Ca0.3CoO3 nanowires. Acta Materialia, 60(3), 1238-1245.
Series/Report no.: Acta materialia
Abstract: We report a systematic study of the magnetic and thermodynamic properties of uniform La0.7Ca0.3CoO3 nanowires prepared by a hydrothermal method, and compare them with the bulk counterpart. The nanowires, ∼59 nm in diameter, are single crystalline as revealed by electron microscopy. With decreasing temperature, the bulk La0.7Ca0.3CoO3 shows a ferromagnetism followed by a reentrant glass state, whereas the nanowires show only a purely ferromagnetic ground state. The thermopower and specific heat results indicate that there exist enhanced spin and/or orbital fluctuations in the nanowires that could be responsible for the absence of the glass state. Critical behavior analysis shows that the nanowires fall into a three-dimensional Heisenberg ferromagnet class.
ISSN: 1359-6454
DOI: 10.1016/j.actamat.2011.11.036
Rights: © 2011 Acta Materialia Inc.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:SPMS Journal Articles

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