Mössbauer study of impurity effect on ferrimagnet Ca3Co2O6 with 1-D ferromagnetic chains

Mössbauer and magnetization have been measured for the samples Ca3(Co1−xMx)2O6, M=57Fe and Zn, with triangular lattice consisting of 1-D ferromagnetic chains. For the sample of x=0.01 (M=Fe), a broad splitting Mössbauer spectrum appears around 40K and changes to the one consisting of three sextets b...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2004-05, Vol.272-276, p.809-810
Main Authors: Arai, Juichiro, Shinmen, Hiroshi, Takeshita, Soshi, Goko, Tatsuo
Format: Article
Language:English
Subjects:
Ising ferromagnet
Magnetic frustration
Mössbauer effect
Triangular lattice
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Summary:Mössbauer and magnetization have been measured for the samples Ca3(Co1−xMx)2O6, M=57Fe and Zn, with triangular lattice consisting of 1-D ferromagnetic chains. For the sample of x=0.01 (M=Fe), a broad splitting Mössbauer spectrum appears around 40K and changes to the one consisting of three sextets below 30K, which can be attributable to the slow relaxation of 57Fe3+ spins embedded in the 1-D chains of Co with strong anisotropy. A comparison of the spectra between x=0.01 (M=Fe) and 0.05 (Fe) samples reveals that increase of Fe-impurity enhances Fe3+ spin fluctuation. It is concluded that the substitution of Fe-impurity cuts the ferromagnetically ordered linear chains and, consequently, the Ising nature of Co3+ spins is much weakened, which provides a new relaxation path for Fe-spin fluctuation.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2003.11.321