Magnetism in RCo2 (R = Dy, Ho, Er, Tm) Under Hydrostatic Pressure
J. Prchal, J. Šebesta, J. Valenta, M. Míšek, D. Turčinková, L. Lapčák, J. Prokleška, M. Kratochvílová and V. Sechovský
Charles University in Prague, Faculty of Mathematics and Physics, DCMP, Ke Karlovu 5, 121 16 Prague 2, Czech Republic
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The short-range parimagnetic configurations, observed in the heavy rare-earth RCo2 compounds in paramagnetic range far above the Curie temperature TC, consist in formation of ferromagnetic cobalt clusters antiferromagnetically coupled to the neighboring R magnetic moments. The characteristic temperature of the onset of parimagnetism Tf is very sensitive to changes of external conditions like pressure or composition. The pressure coefficients ∂Tf/∂p and ∂TC/∂p are comparable, indicating a close connection of underlying mechanisms. Our recent measurements indicate systematic evolution of the pressure coefficients with spanning the rare-earth series from Dy through Tm in RCo2 with a specific case TmCo2.

DOI: 10.12693/APhysPolA.126.288
PACS numbers: 75.20.En, 75.50.Gg