Magnetic properties of the heavy fermion antiferromagnet CeMg$_3$

Details Magnetic properties of the heavy fermion antiferromagnet CeMg$_3$ Magnetic properties of the heavy fermion antiferromagnet CeMg$_3$

2010-11-24

arxiv.org/abs/1011.5414v2

Phys. Rev. B 83, 134416 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 8 figures. Accepted in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.83.134416

We have grown the single crystals of CeMg$_3$ and its non-magnetic analogue LaMg$_3$, which crystallize in the cubic crystal structure with the space group \textit{Fm\rm{\={3}}m}, and studied their magnetic properties on well oriented single crystals by measuring the magnetic susceptibility, magnetization and heat capacity. CeMg$_3$ orders antiferromagnetically with a N\'{e}el temperature $T_{\rm N}$ of 2.6 K. The specific heat capacity at low temperature exhibits an enhanced Sommerfeld coefficient of 370 mJ/K$^2$$...$ mol indicating the heavy fermion nature of CeMg$_3$. An estimation of Kondo temperature $T_{\rm K}$ was made and found that it is of similar magnitude as that of $T_{\rm N}$. The reduced value of the magnetization below the ordering temperature, together with the reduced entropy at the magnetic ordering temperature and the enhanced low temperature heat capacity indicates that Kondo effect plays a significant role in this compound. We have performed the crystalline electric field (CEF) analysis on the magnetic susceptibility and the heat capacity data and found that the ground state is a $\Gamma_7$ doublet with an overall splitting of 191 K.

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