Critical Current Density in Magnetic Dy1 –xErxRh3.8Ru0.2B4 (x = 0.2, 0.4) Superconductors

• Published in: Russian metallurgy Metally 2023-03, Vol.2023 (3), p.297-302
• Main Authors: Lachenkov, S. A., Vlasenko, V. A., Kirillova, V. M., Dement’ev, V. A., Sdobyrev, V. V.
• Format: Article
• Language: English
• Subjects: Antiferromagnetism; Borides; Chemistry and Materials Science; Critical current density; Dysprosium; Erbium compounds; Magnetic moments; Materials Science; Metallic Materials; Rhodium; Scaling laws; Subsystems; Superconductors
• ISSN: 0036-0295; 1555-6255; 1531-8648
• DOI: 10.1134/S0036029523030084

The Dy 0.8 Er 0.2 Rh 3.8 Ru 0.2 B 4 and Dy 0.6 Er 0.4 Rh 3.8 Ru 0.2 B 4 rhodium borides with the LuRu 4 B 4 -type structure are synthesized using the DyRh 3.8 Ru 0.2 B 4 compound via partial substitution of erbium (Er) for dysprosium (Dy). The dependences χ –1 ( T ), M ( B ), and B c2 ( T ) of the compounds are studied. The Dy 0.8 Er 0.2 Rh 3.8 Ru 0.2 B 4 and Dy 0.6 Er 0.4 Rh 3.8 Ru 0.2 B 4 compounds are found to be magnetic superconductors with critical temperatures T c ≈ 5.1 and 5.8, respectively; at T ≈ 3 K, the magnetic subsystem of the compound transfers into an antiferromagnetic state. Based on the measured field dependences of the magnetic moment ( M ( B )) of the Dy 0.8 Er 0.2 Rh 3.8 Ru 0.2 B 4 and Dy 0.6 Er 0.4 Rh 3.8 Ru 0.2 B 4 compounds, the field dependences of the critical current density j c ( B ) and reduced pinning force f ( h ) are obtained using the Bean model. The critical current density of the samples does not exceed 400 A/cm 2 at T ≈ 2 K. In the case of magnetic superconductors with an antiferromagnetic order (Dy 0.8 Er 0.2 Rh 3.8 Ru 0.2 B 4 , Dy 0.6 Er 0.4 Rh 3.8 Ru 0.2 B 4 ), a substantial deviation from a scaling law is observed at h > 0.4.