Superconducting phase diagrams of LuB$_{12}$ and Lu$_{1-x}$Zr$_x$B$_{12}$ ($x \le 0.45$) down to 50 mK
| Autor: | Backai, Julius, Gabani, Slavomir, Flachbart, Karol, Gazo, Emil, Kusnir, Jan, Orendac, Matus, Pristas, Gabriel, Sluchanko, Nikolay, Dukhnenko, Anna, Filipov, Volodymyr, Shitsevalova, Natalya |
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| Rok vydání: | 2019 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.12693/APhysPolA.137.791 |
| Popis: | 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. Comment: 6 pages, 4 figures, CSMAG conference contribution |
| Databáze: | arXiv |
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