Specific heat of stage-2 mncl2 graphite intercalation compound: Co-Existence of spin glass phase and incommensurate short-Range spin order

Masatsugu Suzuki, Itsuko S. Suzuki, Tadashi Adachi, Yoji Koike

Research output: Contribution to journalArticlepeer-review

Abstract

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 41K is the onset of short range spin correlation. The magnetic specific heat C mag at H = 0 is described by Cmag / α(1/T 2) exp(- ΔT ) with Δ = 1.41 ± 0.03 K, while C mag at H = 10 kOe is proportional to T. The entropy due to the broad peak around 5K 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.

Original languageEnglish
Article number124710
Journaljournal of the physical society of japan
Volume82
Issue number12
DOIs
Publication statusPublished - 2013 Dec

Keywords

  • Antiferromagnet
  • Incommensurate spin structure
  • Short-Range spin order
  • Spin frustration
  • Triangular lattice

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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