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Title: Thermoelectric Power and Resistivity of Lal.8Sr0.2CaCu2O6-δ and the Effects of O2 Hot-isostatic-press Annealing
Authors: Liu, Chia-Jyi;Yamauchi, H.
Contributors: 物理學系
Date: 1995-05
Issue Date: 2012-09-10T06:12:51Z
Publisher: The American Physical Society
Abstract: 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.
Relation: Phys. Rev. B, 51(17): 11826-11829
Appears in Collections:[物理學系] 期刊論文

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