Specific Heat of Stage-2 MnCl sub( 2) Graphite Intercalation Compound: Co-Existence of Spin Glass Phase and Incommensurate Short-Range Spin Order

Stage-2 MnCl2 GIC magnetically behaves like a quasi 2D XY antiferromagnet on the triangular lattice with the spin freezing temperature TSG (=1.1 K). We have undertaken an extensive study on the T dependence of specific heat in the absence of an external field H and in the presence of H along the c-p...

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Bibliographic Details
Published in:Journal of the Physical Society of Japan 2013-12, Vol.82 (12), p.1-1
Main Authors: Suzuki, Masatsugu, Suzuki, Itsuko S, Adachi, Tadashi, Koike, Yoji
Format: Article
Language:English
Subjects:
Anomalies
Electron spin resonance
Entropy
Graphite
Intercalation compounds
Neutron scattering
Specific heat
Spin glass
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Summary:Stage-2 MnCl2 GIC magnetically behaves like a quasi 2D XY antiferromagnet on the triangular lattice with the spin freezing temperature TSG (=1.1 K). We have undertaken an extensive study on the T dependence of specific heat in the absence of an external field H and in the presence of H along the c-plane. The magnetic specific heat Cmag at H=0 shows no anomaly at TSG, but exhibits double broad peaks around 5 and 41 K. The anomaly at 41 K is the onset of short range spin correlation. The magnetic specific heat Cmag at H=0 is described by Cmag ... with ..., while Cmag at H=10 kOe is proportional to T. The entropy due to the broad peak around 5 K is 1/3 of the total entropy. The residual entropy is 63% of the total entropy because of highly frustrated nature of the system. These results are consistent with the previous DC susceptibility, neutron scattering, and electron spin resonance (ESR) experiments. (ProQuest: ... denotes formulae/symbols omitted.)
ISSN:0031-9015
1347-4073