Dilution Effect Of Ce Ion In Ceru2al10
26TH INTERNATIONAL CONFERENCE ON LOW TEMPERATURE PHYSICS (LT26), PTS 1-5(2012)
摘要
CeRu2Al10 causes a mysterious phase transition at T-0 similar to 27 K. In order to examine the feature of this transition, we have measured the magnetic susceptibility and electrical resistivity of Ce1-xRxRu2Al10 (R=La, La0.63Y0.37, Y) system in which Ce ions in CeRu2Al10 are replaced by non-magnetic rare earth ions with different ionic radii, where the relationship among the ionic radii is La3+ > (La0.63Y0.37)(3+) similar to Ce3+ > Y3+. The magnitude of the magnetic susceptibility becomes smaller with decreasing ionic radii, indicating Kondo temperature increases due to the chemical pressure effect. In the La- and La0.63Y0.37-substituted system, T-0 decreases monotonically and disappears smoothly at x similar to 0.7, while in the Y-substituted system, T-0 decreases more slowly and disappears suddenly between x=0.4 and 0.5. These behaviors cannot be understood by a simple magnetic phase transition, suggesting that the change in valence of Ce ion plays an important role in the mysterious phase transition.
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