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arXiv · 1009.0201

Thermal and magnetic properties of a low-temperature antiferromagnet Ce$_4$Pt$_{12}$Sn$_{25}$

Nobuyuki Kurita·Han-Oh Lee·Yoshi Tokiwa·Corneliu F. Miclea·Eric D. Bauer·Filip Ronning·J. D. Thompson·Zachary Fisk·Pei-Chun Ho·M. Brian Maple·Pinaki Sengupta·Ilya Vekhter·Roman Movshovich
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Abstract

We report specific heat ($C$) and magnetization ($M$) of single crystalline Ce$_4$Pt$_{12}$Sn$_{25}$ at temperature down to $\sim$50mK and in fields up to 3T. $C/T$ exhibits a sharp anomaly at 180mK, with a large $ΔC/T\sim$30J/molK$^2$-Ce, which, together with the corresponding cusp-like magnetization anomaly, indicates an antiferromagnetic (AFM) ground state with a Néel temperature $T_N$=180mK. Numerical calculations based on a Heisenberg model reproduce both zero-field $C$ and $M$ data, thus placing Ce$_4$Pt$_{12}$Sn$_{25}$ in the weak exchange coupling $J<J_c$ limit of the Doniach diagram, with a very small Kondo scale $T_K\ll T_N$. Magnetic field suppresses the AFM state at $H^*\approx$0.7T, much more effectively than expected from the Heisenberg model, indicating additional effects possibly due to frustration or residual Kondo screening.

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Nobuyuki Kurita, Han-Oh Lee, Yoshi Tokiwa, Corneliu F. Miclea, Eric D. Bauer, Filip Ronning, J. D. Thompson, Zachary Fisk, Pei-Chun Ho, M. Brian Maple, Pinaki Sengupta, Ilya Vekhter, Roman Movshovich. 2010-10-31. Thermal and magnetic properties of a low-temperature antiferromagnet Ce$_4$Pt$_{12}$Sn$_{25}$. https://doi.org/10.1103/physrevb.82.174426

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