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- B. E. Myers
- Carnegie-Mellon University, Pittsburgh, Pennsylvania 15213
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- L. Berger
- Carnegie-Mellon University, Pittsburgh, Pennsylvania 15213
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- S. A. Friedberg
- Carnegie-Mellon University, Pittsburgh, Pennsylvania 15213
抄録
<jats:p>We have measured magnetization isotherms for single crystals of monoclinic Cu(NO3)2·2.5H2O between 1.2° and 4.2°K by a ballistic method. Fields up to 43 kOe were applied along the b axis, i.e., the long axis of the needlelike specimens. The character of the M vs H curves changes rapidly in this temperature interval. They are described in first approximation by a model of this salt in which Cu+ + ions are coupled by isotropic antiferromagnetic exchange, −JS1·S2, in isolated pairs. The best fit of the data with the isolated cluster model yields J = −5.23k and g = 2.23, in reasonable agreement with earlier susceptibility, specific heat, and proton resonance results. Several modifications of the model were considered in order to remove small systematic discrepancies. The addition of a very weak intercluster coupling in a molecular field approximation yields a quantitative fit of all the data. If H = H0+nM, we find n = −1.2 mole/cgs while J = −5.14k and g = 2.35, in even closer agreement with other observations. This weak antiferromagnetic coupling is large enough to explain the absence of hyperfine structure on paramagnetic resonances seen in the excited pair triplet state.</jats:p>
収録刊行物
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- Journal of Applied Physics
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Journal of Applied Physics 40 (3), 1149-1151, 1969-03-01
AIP Publishing
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詳細情報 詳細情報について
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- CRID
- 1360292618521878400
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- NII論文ID
- 30015888764
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- ISSN
- 10897550
- 00218979
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- データソース種別
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