Superconducting and magnetic properties changes of complex rhodium borides RERh3.8Ru0.2B4 in the series of RE = (Gd, Dy, Ho, Er, Y)

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Abstract

Magnetic properties and superconducting characteristics of borides RERh3.8Ru0.2B4 with LuRu4B4 type structure (RE = Y, Er, Ho, Dy), as well as compounds GdRh3.8Ru0.2B4 have been investigated in order to establish formation patterns of superconducting and magnetic subsystems in presented compounds, and their mutual influence. The analysis showed that there is no direct relationship between the critical temperature (Tc) of RERh3.8Ru0.2B4 compounds and their magnetic subsystem. However, a monotonic decrease in the RERh3.8Ru0.2B4 borides critical temperature at successive replacement of RE with Y by Er, Ho, Dy has been established. In this case, the Tc depends linearly on S(S+1), where S is the spin quantum number of the RE+3 ion. Such critical temperature behavior can be associated with the exchange interaction of the conduction electrons spins with the magnetic moments of the RE+3 ions, which increases as the spin quantum number S of the ion increases. The absence of superconductivity in the GdRh3.8Ru0.2B4 compound is also within the established pattern.

About the authors

S. A. Lachenkov

Baikov Institute of Metallurgy and Materials Science

Lenin Ave, 49, Moscow, 119334 Russia

V. A. Vlasenko

P.N. Lebedev Physical Institute

Email: vlasenkovlad@gmail.com
Lenin Ave, 53, Moscow, 119334 Russia

A. Y. Tsvetkov

P.N. Lebedev Physical Institute

Lenin Ave, 53, Moscow, 119334 Russia

L. F. Kulikova

Institute for High Pressure Physics

Kaluga Highway, bld. 14, Troitsk, 108840 Russia

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