Abstract
Although it is well known that LaBa 2Cu 3O y (La123) superconductor has a possibility for the highest T c among REBa 2Cu 3O y (RE123) materials, it is hard to obtain a high T c since solid solutions with low- T c are easily formed. In this work, we prepared La123 thin films by conventional pulsed laser deposition (PLD) method and novel low temperature growth (LTG) technique and we compared T c of the La123 thin films. As a result, La123 thin films grown at a relative low temperature by using LTG technique showed higher T c than those of films grown by PLD method. From an evaluation of orthorhombicity by using in-plane X-ray diffraction system, the orthorhombicity became larger with decreasing the substrate temperature and T c of LTG-La123 thin films also increased up to 83 K. Those facts indicate that the formation of low- T c solid solutions is suppressed by low temperature growth.
Published Version
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