Abstract
The magnetic structure of mixed valence-Kondo-heavy fermion series Ce(Mn1−xCux)2Si2 (0⩽x⩽1) is reported. The magnetic susceptibility results indicate that for 0⩽x⩽0.3, Mn moments are antiferromagnetically (AFM) ordered and the Neel temperature TN decreases rapidly with decreasing x. For 0.4⩽x⩽0.7, ferromagnetic (FM) phase is observed below 140K and both the ordering temperature Tc and Curie–Weiss temperature θp decrease with increasing x, showing the weakening of in-plane FM magnetic coupling between Mn moments due to the substitution of Mn by nonmagnetic Cu. For 0.8⩽x⩽1, samples exhibit only paramagnetic behavior. The types of magnetic order in this series are basically consistent with the criterion that FM (AFM) phase is favored when intralayer Mn–Mn spacing RMn–Mna is greater (smaller) than a critical value of 2.865Å. A magnetic phase diagram is constructed for this compound series.
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