Increase of Tc in the 1:2:3 superconductors YBCO and (CaxLa1−x)(LauBa1−u)2Cu3Oy after slow cooling or low temperature annealing期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Increase of T_c in the 1:2:3 superconductors YBCO and (Ca_xLa_1−x)(La_uBa_1−u)₂Cu₃O_y after slow cooling or low temperature annealing

Authors:	A. Knizhnik G.M. Reisner

Affiliation:	^a Crown Centre for Superconductivity, Department of Physics, Technion-Israel Institute of Technology, Haifa 32000, Israel ^b Department of Physics, Northwestern University, Evanston, IL 60208, USA

Abstract:	The well known phenomenon of the increase of T_c of YBCO after slow cooling or low temperature annealing without change of the oxygen content, was found also for the YBCO like tetragonal superconductors of (Ca_xLa_1−x)(La_uBa_1−u)₂Cu₃O_y (this compound has been previously denoted as CLBLCO, CLBCO or CaLaBaCuO). It has been observed at 150 and 100 °C for oxygen underdoped, optimally- and overdoped ceramics. The products retain their tetragonal unit cells. The possible reasons of this phenomenon are discussed.

Keywords:	A. Superconductors A. Ceramics A. Oxides D. Superconductivity D. Electrical properties
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