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.

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About the authors

S. A. Lachenkov

Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences

Email: vlasenkovlad@gmail.com
Russian Federation, Moscow

V. A. Vlasenko

P.N. Lebedev Physical Institute, Russian Academy of Sciences

Author for correspondence.
Email: vlasenkovlad@gmail.com
Russian Federation, Moscow

A. Yu. Tsvetkov

P.N. Lebedev Physical Institute, Russian Academy of Sciences

Email: vlasenkovlad@gmail.com
Russian Federation, Moscow

L. F. Kulikova

Institute for High Pressure Physics, Russian Academy of Sciences

Email: vlasenkovlad@gmail.com
Russian Federation, Troitsk, Moscow, 108840

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Supplementary files

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2. Fig. 1. RERh4B4 is a primitive tetragonal structure of the CeCo4B4 type (a); RERh4B4 is a body-centered tetragonal structure of the LuRu4B4 type compound (b).

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3. Fig. 2. Dependence of the critical temperature (Tc) of lanthanum alloys containing ~ 1 at.% of impurities of various RE on the value of S(S+1) of the RE ion according to the data of the authors of [19].

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4. Fig. 3. Dependence of the magnetic moment M(T) of the GdRh3.8Ru0.2B4 compound in FC and ZFC modes in fields of 20, 100, 1000 Oe. The inset shows data on the HoRh3.8Ru0.2B4 compound [23].

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5. Fig. 4. Temperature dependences of the specific electrical resistance of the GdRh3.8Ru0.2B4 sample in fields up to 1000 Oe. The inset shows data in the temperature range of 2–25 K.

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6. Fig. 5. Dependence of the inverse susceptibility (1/χv) on temperature for GdRh3.8Ru0.2B4.

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7. Fig. 6. Dependences of the magnetic moment on the applied external magnetic field M(H) for GdRh3.8Ru0.2B4: (a) at T = 2, 4, 10, 20, 40 K and (b) T = 80, 90, 100, 120 K.

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8. Fig. 7. Dependence of Tc for a series of rhodium borides RERh3.8Ru0.2B4 (RE = Y, Er, Ho, Dy, Gd) with the LuRu4B4 type structure on the de Gennes factor — (g–1)2J(J+1) (a) and S(S+1) of the RE ion (b).

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