Thermal Analysis of Freedom of Spin in Partially Disordered State of the Antiferromagnetic Triangular Lattice in CuFeO<SUB>2</SUB>

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  • Takeda Kazuyoshi
    Department of Applied Science, Faculty of Engineering, Kyushu University, Fukuoka 812
  • Miyake Keita
    Department of Applied Science, Faculty of Engineering, Kyushu University, Fukuoka 812
  • Hitaka Masako
    Department of Applied Science, Faculty of Engineering, Kyushu University, Fukuoka 812
  • Kawae Tatsuya
    Department of Applied Science, Faculty of Engineering, Kyushu University, Fukuoka 812
  • Yaguchi Nariyasu
    Department of Applied Physics, Fukui University, 3–9–1, Fukui 910
  • Mekata Mamoru
    Department of Applied Physics, Fukui University, 3–9–1, Fukui 910

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  • Thermal Analysis of Freedom of Spin in Partially Disordered State of the Antiferromagnetic Triangular Lattice in CuFeO2
  • Thermal Analysis of Freedom of Spin in

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Abstract

The partially disordered spins in the triangular antiferromagnetic lattice in CuFeO2 have been studied by heat capacity measurements. A cusp and a sharp peak in the heat capacity curve were observed at TN1=14.0± 0.5, K and TN2=11.0± 0.5, K, respectively.The analysis of heat capacity revealed that the magnetic entropy associated with the anomaly in the heat capacity around TN2 is attributable to the disordering of one-fifth of Fe3+ spins. The present result is discussed in comparison with partially disordered states of CeSb and PrCo2Si2, anisotropic spin systems with frustration. The heat capacity cusp around TN1 is compared with the characteristic thermal behavior for frustrated spin systems.

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