Figure 4
(a) Specific heat
Cp (solid circles) of Gd4Ga2O9 under zero field in the temperature range from 0.40 to 30 K. The dash–dotted line represents the phonon contribution by the Debye function fit (see the text for details). (b) (left axis) and the magnetic entropy (right axis) calculated from curves of Gd4Ga2O9 versus temperature. The theoretical Gd3+ magnetic ion contribution to the magnetic entropy is indicated by the dotted line positioned at R ln8. |