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題 名 | Specific Heat Anomaly for a Layer Antiferromagnet |
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作 者 | Nie,Y. M.; Hsiao,P. Y.; Chiang,Y. F.; Lee,T. K.; | 書刊名 | Chinese Journal of Physics |
卷 期 | 39:6 2001.12[民90.12] |
頁 次 | 頁606-618 |
分類號 | 336.9 |
關鍵詞 | |
語 文 | 英文(English) |
英文摘要 | The pronounced specific heat anomaly observed in cuprate oxide superconductors with Gd layers below the Néel temperature TN is studied by using the modified spin-wave theory for an anisotropic layer antiferromagnetic system. The present work elucidates that the anomaly feature is mainly due to the large spin effect of the Gd³⁺-ion. Our result agrees well with the experiments. In addition, the observed disappearance of the specific heat anomaly in the presence of a magnetic field is also obtained. The specific heat above TN is calculated by using a high temperature expansion. The breakdown of the generalized modified spin-wave theory for the large-spin layer antiferromagnetic systems is explicitly demonstrated in the evaluation of the sublattice magnetization and correlation function. |
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