Publication Date:
2016-01-30
Description:
The electronic structure and a number of thermodynamic characteristics of the ternary R Rh 4 B 4 ( R = Y, Lu) systems of superconductors in the normal phase are calculated from first principles. The electronic states and interactions responsible for the superconducting and magnetic properties of these systems are analyzed. It is found that the Fermi level in the compounds YRh 4 B 4 and LuRh 4 B 4 is immediately adjacent to a peak in the density of electronic states and about 1 eV above a pseudogap in the electronic spectrum. The existence of a number of groups of quasi-degenerate electronic states with low effective masses near the Fermi level is revealed. These states may be the cause of a significant diamagnetic contribution of the conduction electrons to the magnetic susceptibility and may be responsible for the strong temperature dependence of the susceptibility in the rhodium borides.
Print ISSN:
1063-777X
Electronic ISSN:
1090-6517
Topics:
Physics
