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| 題名: | Thermoelectric Power and Resistivity of Lal.8Sr0.2CaCu2O6-δ and the Effects of O2 Hot-isostatic-press Annealing |
| 作者: | Liu, Chia-Jyi;Yamauchi, H. |
| 貢獻者: | 物理學系 |
| 日期: | 1995-05
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| 上傳時間: | 2012-09-10T06:12:51Z
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| 出版者: | The American Physical Society |
| 摘要: | We have measured the resistivity and thermoelectric power of La1.8Sr0.2CaCu2O6-δ for 15≤T≤340 K. For the as-sintered sample heated under one atmosphere of oxygen, a minimum resistivity occurs at ca. 100 K, and the conductivity can be fitted to the form exp(T-1/2) or exp(T-1/4) for 30.3≤T≤86.8 K. The thermoelectric power varies as T1/2 for 20≤T≤200 K and exhibits a saturated value of ca. 100 μV/K for T≥230 K. Upon O2 HIP (hot isostatic press) treatment, the upturn of resistivity (metal- nonmetal transition) is suppressed and superconductivity ensues, and the thermoelectric power decreases in magnitude and displays a broad maximum at ca. 190 K in a manner similar to La2-xSrxCuO4-δ. It is conceivable that the O2 HIP treatment suppresses the metal-nonmetal transition as a result of increasing carrier concentration and possibly enhancing cation ordering. The possible origin of the metal-nonmetal transition is discussed. |
| 關聯: | Phys. Rev. B, 51(17): 11826-11829 |
| 顯示於類別: | [物理學系] 期刊論文
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