Abstract
The complex way and the importance of solving the problem of coexistence of cooperative magnetism and superconductivity are emphasized by the example of a large group of borides of rare-earth and platinum metals with the general formula RE(Rh1 − xRux)4B4 and cluster structure of the LuRu4B4 type. To analyze the influence of the magnetic subsystem on Bc2(T), the Werthamer, Gelfand, and Hohenberg (WGH) theory is used, based on which, calculated dependences χ(T), which agree with the experimental results, are found. It is shown that by purposefully varying the magnetic subsystem a superconducting one can be formed and the dependence Bc2(T) required for it can obtained. Such approach is also recommended for strong-field superconductors—complex arsenides of iron and lanthanum with fluorine additives.
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