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arXiv 1907.04731cond-mat.supr-concond-mat.str-el
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LuB$_{12}$ 和 Lu$_{1-x}$Zr$_x$B$_{12}$($x \le 0.45$)低至 50 mK 的超导相图

Superconducting phase diagrams of LuB$_{12}$ and Lu$_{1-x}$Zr$_x$B$_{12}$ ($x \le 0.45$) down to 50 mK

Julius Backai, Slavomir Gabani, Karol Flachbart, Emil Gazo, Jan Kusnir, Matus Orendac, Gabriel Pristas, Nikolay Sluchanko, Anna Dukhnenko, Volodymyr Filipov, Natalya Shitsevalova

AI总结:

本文通过自研低温磁化率计测量 Lu(1-x)Zr(x)B12 单晶在 50 mK 至 1 K 的磁交流磁化率,揭示了锆替代镥引起的弱耦合到强耦合超导转变及 Tc、Hc 随 x 增加的相图演化。

摘要:

十二硼化镥 LuB12 是一种简单的弱耦合 BCS 超导体,其临界温度 Tc = 0.42 K,而 ZrB12 是一种强耦合 BCS 超导体,在该类材料中具有最高的临界温度 Tc = 6.0 K。在 LuB12 中用锆离子替代镥的情况下,可以研究从弱耦合到强耦合超导体的转变。我们通过测量 1 K 至 50 mK 之间的磁交流磁化率,研究了高质量单晶超导样品 Lu(1-x)Zr(x)B12(0 =< x =< 0.45)中临界温度 Tc 和临界场 Hc 的演化。为了获得这类实验数据,我们设计、构建并测试了一种新型磁化率计,它可以在 3He-4He 稀释制冷机中于 0.05 K - 3 K 的宽温度范围内工作。使用这种新型磁化率计进行的测量揭示了 Tc(x) 和 Hc(x) 如何随着 Lu(1-x)Zr(x)B12 固溶体中锆浓度的增加而升高,以及它们的超导相图如何发展。

英文摘要:

Lutetium dodecaboride LuB12 is a simple weak-coupling BCS superconductor with critical temperature Tc = 0.42 K, whilst ZrB12 is a strong-coupling BCS superconductor with the highest critical temperature Tc = 6.0 K among this group of materials. In case of lutetium substitution by zirconium ions in LuB12 the crossover from weak- to strong-coupling superconductor can be studied. We have investigated the evolution of critical temperature Tc and critical field Hc in high-quality single crystalline superconducting samples of Lu(1-x)Zr(x)B12 (0 =< x =< 0.45) by measuring magnetic ac susceptibility between 1 K and 50 mK. To obtain this kind of experimental data, a new susceptometer was designed, constructed and tested, which can work in a wide temperature range of 0.05 K - 3 K in 3He-4He dilution refrigerator. The measurements with this new susceptometer revealed how Tc(x) and Hc(x) increases with increasing concentration of zirconium in Lu(1-x)Zr(x)B12 solid solutions as well as how their superconducting phase diagram develops.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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