非晶La80Al20晶化相的超导电性

黄新明; 何寿安; 王文魁

doi:10.11858/gywlxb.1987.02.005

非晶La80Al20晶化相的超导电性

doi: 10.11858/gywlxb.1987.02.005

1.
中国科学院物理研究所，北京 100080；
2.
中国高等科学技术中心（世界实验室），凝聚态和辐射物理分中心，北京 100080

详细信息

通讯作者:
黄新明

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出版历程
- 收稿日期: 1987-07-08
- 修回日期: 1987-07-08
- 发布日期: 1987-12-05

Superconductivity of Crystallized Phases from Amorphous La80Al20

1.
Institute of Physics, Academia Sinica, Beijing 100080, China;
2.
Center for Condensed Matter and Radiation Physics, CCAST (World Laboratory), Beijing 100080, China

More Information

Corresponding author: HUANG Xin-Ming

摘要

摘要: 本文把非晶La80Al20在真空中、不同温度及其时间条件下进行退火，以及在6 GPa不同温度退火40 min，并对退火样品的相结构及超导性进行了研究。发现真空中，250 ℃退火的样品晶化成了T4.2 K、不超导的单相四方La4Al；300 ℃及450 ℃退火的样品晶化成La3Al、-La、-La及一些未知杂相，这些多相混合物的TC6.0 K。在6 GPa 300 ℃及以下温度退火的样品，晶化成单相六角La4Al，其晶格常数与六角La3Al的完全相同，这些样品的TC5.1 K；6 GPa、350 ℃及以上温度退火的样品，晶化成La3Al相及新未知相H，新相H的TC约为6.3 K。
- 非晶合金 /
- 亚稳相 /
- 超导电性
Abstract: In this paper, we studied the structures and superconductivity of the samples annealed from a morphous La80Al20 alloy under different treatments. It was found that when annealed in vacuum at 250 ℃, the a morphous alloy crystallized into the sample of a tetragonal single phase La4Al for which where is no TC as T4.2 K. When annealed in vacuum at 300 ℃, or 450 ℃, the amorphous samples crystallized into the samples of hexagonal La3Al, -La, -La and some unknown phases, the TC ofthese multiphase samples is lower than 6.0 K. When annealed under 6 GPa, if annealing temperature Ta300 ℃, the amorphous alloy crystallized into the sample of hexagonal La4Al, the parameters of which are exactly the same as hexagonal La3Al and TC of which is lower than 5.7 K; if Ta350 ℃, the amorphous alloy crystallized into the sample of hexagonal La3Al and a unknown phase H, the TC of new phase H is 6.3 K.
- amorpous alloy /
- metastable phase /
- superconductivity