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非晶La80Al20晶化相的超导电性

SUPERCONDUCTIVITY OF CRYSTALLIZED PHASES FROM AMORPHOUS La80Al20

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【作者】 黄新明何寿安王文魁

【Author】 Huang Xinming He Shouan(institute of Physics. Chinese Academy of Sciences)W.K.Wang (Center of Condensed Matter and Radiation, CCAST (World Laboratory)and Institute of Physics .Chinese Academy of Soienses, Beijing, China)

【机构】 中国科学院物理研究所凝聚态和辐射物理分中心 中国高等科学技术中心 北京中国科学院物理研究所

【摘要】 本文把非晶La80Al20在真空中、不同温度及时间条件下进行退火,以及在6GPa不同温度退火40min,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T>4.2K,不超导的单相四方La4Al;300℃及450℃退火的样品晶化成La3Al,α-La、β-La及一些未知杂相,这些多相混合物的Tc<6.0K。在6GPa 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Tc>5.1K;6GPa、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为6.3K。

【Abstract】 In this paper, we studied the structures and superconductivity of the samples annealed from amorphous La80Al20 alloy under different treatments. It was found that when annealed in vacuum at 250℃, the amorphous alloy crystallized into the sampleof a tetragonal single phase La4Al for which there is no Tc as T>4. 2 K . When annealed in vacuum at 300℃, or 450℃, the amorphous samples crystallized into the samples of hexagonal La3Al, α-La, β-La and some unknown phases, the Tc of these multiphase samples is lower than 6.OK. When annealed under 6GPa, if annealing temperature Ta≤300℃, 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 5.7K; if Ta≥350℃, the amorphous alloy crystallized into the sample of hexagonal La3Al and a unknown phase H, the Tc of new phase H is 6.3K.

【关键词】 非晶合金亚稳相超导电性
【Key words】 amorpous alloymetastable phasesuperconductivity.
  • 【文献出处】 高压物理学报 ,Chinese Journal of High Pressure Physics , 编辑部邮箱 ,1987年02期
  • 【被引频次】1
  • 【下载频次】25
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