Abstract
Structure, critical behavior and magnetic properties of Mn5Ge3−xAgx compounds with x = 0 and 0.1 have been investigated. With the substitution of Ge by Ag, the Curie temperature decreases from 299.8 to 295.1 K. Investigations for isothermal magnetization curves by Arrott curves, the Landau theory and phenomenological universal curves reveal that this system undergoes a second-order phase transition. To investigate the nature of magnetic transition, a detailed critical parameter study obtained by modified Arrott plots, Kouvel-Fisher method, and critical isothermal analysis has been performed. In comparison with the values given by standard models, these obtained critical parameters suggest a 3D long-range magnetic coupling with the exchange distance decaying as J(r) ≈ r−4.57 and J(r) ≈ r−4.67 for Mn5Ge3 and Mn5Ge2.9Ag0.1.
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