Magnetic Phase Boundary for a Quasi-Two-Dimensional Isotropic Antiferromagnet Mn(HCOO)<SUB>2</SUB>·2H<SUB>2</SUB>O

  • Takeda Kazuyoshi
    Department of Material Physics, Faculty of Engineering Science, Osaka University
  • Koyama Kuniyuki
    Department of Material Physics, Faculty of Engineering Science, Osaka University

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  • Magnetic Phase Boundary for a Quasi-Two-Dimensional Isotropic Antiferromagnet Mn(HCOO)2・2H2O
  • Magnetic Phase Boundary for a Quasi Two
  • Magnitic Phase Boundary for a Quasi-Two-Dimensional Isotropic Antiferromagnet Mn(HCOO)<sub>2</sub>·2H<sub>2</sub>O

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The fully mapped T-H (temperature-magnetic field) phase diagram of a quasi-two-dimensional (2d) antiferromagnet Mn(HCOO)2·2H2O (TN=3.69 K) has been determined by the measurements of magnetic heat capacity and susceptibility. The critical field has been estimated to be 105±5 kOe at T=0 K, which gives the intra-layer exchange constant |J|⁄kB=0.35±0.02 K. By applying external field, an anomalous increase of the Néel temperature TN(H) has been found (TN(H)≈1.10TN(0) at H=35 kOe) for the first time in this 2d compound as in the case of quasi-1d compounds.

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