Magnetocaloric effects Metamagnetic transition Rare earth-transition metal compounds
Issue Date:
2002
Publisher:
Journal of Magnetism and Magnetic Materials
Citation:
Volume 242-245, Issue PART II, Page 873-875
Abstract:
Magnetisation isotherms were measured for a number of (R, R?)Co2 and (R, Y)Co2 (R, R? = rare
earths) compounds. A metamagnetic transition is observed just above the Curie temperature (TC) of
compounds having a first-order phase transition, i.e. ErCo2, HoCo2 and (Dy, Y)Co2. The magnetic entropy
change ??Sm shows a largest value of -11.8 J/mol K at 35 K for ErCo2 and it decreases exponentially with
increasing temperature. The obtained thermal variation of ??Sm is compared to that of RAl2 and other
intermetallic compounds. Giant magnetocaloric effects observed in RCo2-based compounds are discussed in
terms of the 4f(R)-localised spin, 3d(Co)-spin fluctuations as well as nature of the phase transition. ?? 2002
Elsevier Science B.V. All rights reserved.
