Heat Capacity of Two Dimensional Heisenberg Antiferromagnet with s=5/2

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  • Yamamoto Yuji
    Department of Material Physics, Faculty of Engineering Science, Osaka University
  • Matsuura Motohiro
    Department of Material Physics, Faculty of Engineering Science, Osaka University
  • Haseda Taiichiro
    Department of Material Physics, Faculty of Engineering Science, Osaka University

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  • Heat Capacity of Two Dimensional Heisen

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The heat capacities of a quasi two dimensional Heisenberg antiferromagnet Mn(HCOO)2·2H2O and its isomorphous and nonmagnetic salts Mg(HCOO)2·2H2O and Zn(HCOO)2·2H2O have been measured between 2 and 50 K. The lattice heat capacities of these salts are examined and found to be reproduced by a sum of both Debye and Einstein type heat capacities. By subtracting the lattice heat capacity thus obtained, the magnetic heat capacity of Mn(HCOO)2·2H2O is obtained unambiguously. This is compared with the calculated one by high temperature series expansion. Agreement is excellent with J⁄k=−0.34±0.01 K in the temperature range above 6 K where the convergence of the series is good. The present result above TN is suggested to give a probable estimate for the ideal s=5⁄2 two dimensional Heisenberg antiferromagnet.

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