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Lutetium dodecaboride LuB12 is a simple weak-coupling BCS superconductor withcritical temperature Tc = 0.42 K, whilst ZrB12 is a strong-coupling BCSsuperconductor with the highest critical temperature Tc = 6.0 K among thisgroup of materials. In case of lutetium substitution by zirconium ions in LuB12the crossover from weak- to strong-coupling superconductor can be studied. Wehave investigated the evolution of critical temperature Tc and critical fieldHc in high-quality single crystalline superconducting samples ofLu(1-x)Zr(x)B12 (0 =< x =< 0.45) by measuring magnetic ac susceptibilitybetween 1 K and 50 mK. To obtain this kind of experimental data, a newsusceptometer was designed, constructed and tested, which can work in a widetemperature range of 0.05 K - 3 K in 3He-4He dilution refrigerator. Themeasurements with this new susceptometer revealed how Tc(x) and Hc(x) increaseswith increasing concentration of zirconium in Lu(1-x)Zr(x)B12 solid solutionsas well as how their superconducting phase diagram develops.

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