We report specific heat (C) and magnetization (M) of single crystalline Ce4 Pt12 Sn25 at temperature down to ∼50 mK and in fields up to 3 T. C/T exhibits a sharp anomaly at 180 mK, with a large ΔC/T∼30 J/molCe K2, which, together with the corresponding cusplike magnetization anomaly, indicates an antiferromagnetic (AFM) ground state with a Néel temperature TN =180 mK. Numerical calculations based on a Heisenberg model reproduce both zero-field C and M data, thus placing Ce 4 Pt12 Sn25 in the weak exchange coupling J< Jc limit of the Doniach diagram, with a very small Kondo scale TK TN. Magnetic field suppresses the AFM state at H⊃ ≈0.7 T, much more effectively than expected from the Heisenberg model, indicating additional effects possibly due to frustration or residual Kondo screening. © 2010 The American Physical Society.
Publication Source (Journal or Book title)
Physical Review B - Condensed Matter and Materials Physics
Kurita, N., Lee, H., Tokiwa, Y., Miclea, C., Bauer, E., Ronning, F., Thompson, J., Fisk, Z., Ho, P., Maple, M., Sengupta, P., Vekhter, I., & Movshovich, R. (2010). Thermal and magnetic properties of the low-temperature antiferromagnet Ce4 Pt12 Sn25. Physical Review B - Condensed Matter and Materials Physics, 82 (17) https://doi.org/10.1103/PhysRevB.82.174426