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(Color online) Rietveld refined powder XRD patterns of Ho3Ni2 and Er3Ni2 at room temperature. The observed data are indicated by crosses, and the calculated profile is the continuous line overlying them. The short vertical lines indicate the angular positions of the Bragg peaks of Ho3Ni2 and Er3Ni2. The lower curve shows the difference between the observed and calculated intensity.
(Color online) Temperature dependences of ZFC and FC magnetizations of Ho3Ni2 (a) and Er3Ni2 (b) under 0.01 T. The insets of (a) and (b) show the temperature variations of the ZFC inverse susceptibility fitted to the Curie-Weiss law under 2 T for Ho3Ni2 and Er3Ni2, respectively.
(Color online) Typical magnetic isothermals of Ho3Ni2 (a) and Er3Ni2 (b) measured during field increasing. The insets of (a) and (b) show the Arrott-plots of Ho3Ni2 and Er3Ni2 around T C, respectively.
(Color online) (a) Magnetic entropy change as a function of temperature for Ho3Ni2 and Er3Ni2 for magnetic field changes of 0-2 T and 0-5 T, where the inset shows the temperature dependence of magnetic entropy change for the composite material for a field change of 0-5 T. (b) Temperature dependences of the specific capacities for Ho3Ni2 and Er3Ni2 under zero field, where the inset shows the adiabatic temperature change curves for field changes of 0-2 T and 0-5 T.
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