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首页> 外文期刊>Chinese science bulletin >Phases in YBa_2Cu_3O_(7-δ) system doped by V_2O_5
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Phases in YBa_2Cu_3O_(7-δ) system doped by V_2O_5

机译：V_2O_5掺杂的YBa_2Cu_3O_（7-δ）系统中的相

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摘要

Since the discovery of high-T_c superconductors, additions of proper elements to YBa_2Cu_3O_(7-δ) system have been proved to be quite effective in both mechanism researches and improvements of sample preparation technique. Recently, an interesting phenomenon in YBa_2Cu_3O_(7-δ) was reported by Feng Yong et al., i.e. when being doped with appropriate amounts of V_2O_5, samples which have been quenched in air from 900°C to room temperature could show superconducting transition above 88 K, while theundoped one prepared under similar conditions are not superconductors. To become supercondcuting, the samples must be annealed or cooled slowly in the oxygen atmosphere so that the nonsuperconducting tetragonal phase formed at high temperature can absorboxygen enough to transform to superconducting orthorhombic phase during 600--800 °C. Although they have been widely used in the sample preparations, the above heat-treatment methods appear not to be very suitable for the fabrication of thin film with high quality since there always exist mutual element diffusions between the film and the substrate, which sometimes makes T_c lower. However, work of Feng Yong et al. has pointed out that such heat-treatment might be avoided through proper element additions. Therefore, it would be of great significance to identify all the phases in the V_2O_5-doped YBa_2Cu_3O_(7-δ) system. Experiments and results of this respect will be contributed in this note.
机译：自从发现高T_c超导体以来，已证明向YBa_2Cu_3O_（7-δ）体系中添加适当的元素在机理研究和样品制备技术改进方面都非常有效。最近，冯勇等人报道了YBa_2Cu_3O_（7-δ）的一个有趣现象，即当掺入适量的V_2O_5时，在空气中从900°C淬火到室温的样品可能显示出超导转变。 88 K，而在相似条件下制备的未掺杂的不是超导体。要进行超导电，必须在氧气气氛中将样品缓慢退火或冷却，以使在高温下形成的非超导四方相可以吸收足够的氧气，从而在600--800°C的温度下转变为超正交相。尽管它们已被广泛用于样品制备中，但上述热处理方法似乎并不非常适合于高质量薄膜的制造，因为在薄膜和基底之间总是存在相互的元素扩散，这有时使T_c降低。然而，冯勇等人的工作。已经指出，可以通过适当添加元素来避免这种热处理。因此，确定V_2O_5掺杂的YBa_2Cu_3O_（7-δ）系统中的所有相具有重要意义。这方面的实验和结果将在本说明中提供。

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