National Changhua University of Education Institutional Repository : Item 987654321/14127

English | 正體中文 | 简体中文 | Items with full text/Total items : 6507/11669
Visitors : 30084306 Online Users : 877

RC Version 3.2 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.

Scope Adv. Search

Login ‧ Upload ‧ Help ‧ About ‧ Administer

NCUEIR > College of Science > Department of Physics > Periodical Articles > Item 987654321/14127

Please use this identifier to cite or link to this item: http://ir.ncue.edu.tw/ir/handle/987654321/14127

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:	[Department of Physics] Periodical Articles

Files in This Item:

File	Size	Format
index.html	0Kb	HTML	588	View/Open