| 題名: | Kinetic energy driven superconductivity in the electron doped cobaltate NaxCoO2 · yH2O |
| 作者: | Liu, Bin;Liang, Ying;Feng, Shi-ping;陳惟堯;Chen, Wei-yeu |
| 貢獻者: | 淡江大學物理學系 |
| 關鍵詞: | Superconducting mechanism;Electron doped cobaltate;Cooper pairs |
| 日期: | 2005-06-15 |
| 上傳時間: | 2009-12-31 10:09:51 (UTC+8) |
| 出版者: | Chinese Physical Society/Institute of Theoretical Physics. |
| 摘要: | Within the charge-spin separation fermion-spin theory, we show that the mechanism of superconductivity in the electron doped cobaltate NaxCoO2centerdotyH2O is ascribed to its kinetic energy. The dressed fermions interact occurring directly through the kinetic energy by exchanging magnetic excitations. This interaction leads to a net attractive force between dressed fermions, then the electron Cooper pairs originating from the dressed fermion pairing state are due to the charge-spin recombination, and their condensation reveals the superconducting ground state. The superconducting transition temperature is identical to the dressed fermion pair transition temperature, and is suppressed to a lower temperature due to the strong magnetic frustration. The optimal superconducting transition temperature occurs in the electron doping concentration δ≈0.29, and then decreases for both underdoped and overdoped regimes, in qualitative agreement with the experimental results. |
| 關聯: | Communications in Theoretical Physics 43(6), pp.1127-1132 |
| DOI: | 10.1088/0253-6102/43/6/034 |
| 顯示於類別: | [物理學系暨研究所] 期刊論文
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