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(Color online) M(H) isothermal magnetization of: (a) Tb5Si2Ge2 in the temperature range of 77–300 K and (b) Gd5Si2Ge2 in the temperature range of 77–340 K, for applied fields H up to 31 T. Arrott plots for: (c) Tb5Si2Ge2 (Inset: T = 124 K) and (d) Gd5Si2Ge2 (Inset: T = 314 K).
(Color online) (a) Temperature dependence of the spontaneous magnetization (blue dots) and reciprocal susceptibility (red triangle) curves of Tb5Si2Ge2 obtained from Arrot representation. The dashed lines (dash lines) are the spontaneous magnetization Brillouin curves assuming and . (b) Temperature dependence of the HC (T). (c) Magnetic and crystallographic phases diagram of Tb5(Si x Ge1− x )4 taken from Ref. 8 including the determined value of (star). The square represents the temperature of the order-disorder transition (for x > 0.45: PM →FM and for x < 0.45 from PM to AFM state). The circle symbols represent the order-order transition also called spin reorientation transition.
(Color online) Change in the magnetic free energy as a function of temperature of both structures (M and O(I)) for Tb5Si2Ge2 using Eq. (1).
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