Crystal Structure, Magnetic Properties and Bonding Analysis of M3Pt23Ge11 (M=Ca, Sr, Ba and Eu)
Xin Gui, Robert J. Cava
TL;DR
This study reports four new M3Pt23Ge11 phases, analyzing their structures and magnetic properties, revealing ferromagnetic ordering in Eu3Pt23Ge11 and insights into structural stability factors.
Contribution
It introduces four new M3Pt23Ge11 phases with detailed structural and magnetic analysis, highlighting the role of Eu-Eu distance and bonding in stability.
Findings
Eu3Pt23Ge11 exhibits ferromagnetic ordering at ~3 K.
None of the phases are superconducting above 1.8 K.
Structural stability is influenced by Eu-Eu distance and bonding interactions.
Abstract
The properties of Pt-based materials can be intriguing due to the importance of spin-orbit coupling for Pt. Herein, we report four new phases with formulas M3Pt23Ge11 (M = Ca, Sr, Ba and Eu), which adopt the same structure type as Ce3Pt23Si11. Magnetic susceptibility measurements indicate that none of the phases is superconducting above 1.8 K, while for Eu3Pt23Ge11 ferromagnetic ordering is observed at ~ 3 K. The low Curie temperature for that material compared to that of Eu3Pt23Si11 may be due to its larger Eu-Eu distance. One potential factor that destabilizes the structure of other rare-earth based M3Pt23Ge11 is demonstrated through COHP calculations.
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