The magnetostriction of the intermetallic compound ErCo2 near the magnetic phase transition paramagnetism-ferrimagnetism

• Main Authors: Nikitin, S A, Karpenkov, D Yu, Karpenkov, A Yu, Nizhankovskii, N I, Palewski, T, Skokov, K P
• Format: Conference Proceeding
• Language: English
• Subjects: Electrons; Ferrimagnetism; Intermetallic compounds; Magnetic fields; Magnetostriction; Paramagnetism; Phase transitions; Physics; Subsystems; Thermal expansion
• ISSN: 1742-6596; 1742-6588; 1742-6596
• DOI: 10.1088/1742-6596/303/1/012032

The purpose of this work was the investigation of magnetostriction near magnetic phase transition paramagnetism-ferrimagnetism in ferrimagnetic intermetallic compound ErCo2. It is known that 3d-electrons are delocalized and form a 3d-zone in it, whereas 4f-electrons localized and create an effective exchange field which acts on the Co sublattice. It leads to magnetic ordering of the last. We have found there is a sharp jump in the curve of thermal expansion near T 37K, which indicates the presence of first order phase transition. Volume magnetostriction ω reach huge values (3.103 in the field μ0H 4T near TC). At temperatures T > TC λ|| and λ⊥ have small values in the absence of an external magnetic field. However, in fields H>Hcrit λ || and λ⊥ rapidly increase and get the values that have the same order of magnitude as at T≈TC. This indicates that the external magnetic field can restore the magnetism of 3d-subsystem at T>TC.