Publication Date:
2016-04-07
Description:
Specific heat C M ( T ) of polycrystalline Dy 0.6 Y 0.4 Rh 4 B 4 and Dy 0.6 Y 0.4 Rh 3.85 Ru 0.15 B 4 was studied in the temperature range of 0.5–9 K and magnetic fields 0–10 kOe for the first time. It was found that the λ-anomaly in the specific heat exists at T c ≈ 6 K for Dy 0.6 Y 0.4 Rh 4 B 4 and at T c ≈ 6.6 K for Dy 0.6 Y 0.4 Rh 3.85 Ru 0.15 B 4. It is suppressed in a magnetic field and shifted to lower temperatures. Partial substitution of Rh by Ru enhances superconductivity, presumably, due to stronger inner magnetism of the dysprosium sublattice in Dy 0.6 Y 0.4 Rh 4 B 4 as compared with Dy 0.6 Y 0.4 Rh 3.85 Ru 0.15 B 4 . Furthermore, it was observed that the molar heat capacity C M ( T ) of Dy 0.6 Y 0.4 Rh 3.85 Ru 0.15 B 4 increases with decreasing temperature for T 〈 4 K. In Dy 0.6 Y 0.4 Rh 4 B 4 , an increase in C M ( T ) with decreasing temperature is accompanied by the appearance of a maximum at T max = 1.5 K, which might be a manifestation of the magnetic phase transition in the dysprosium subsystem at this temperature.
Print ISSN:
1063-777X
Electronic ISSN:
1090-6517
Topics:
Physics
