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Abstract:
High precision measurements of the thermal expansion coefficient, α(T), of the Kondo lattice systems CeAl2 and CeB6 reveal the coexistence of two second-order phase transitions at the Néel temperaturesT N =3.9 K and 2.35 K, respectively. These results are discussed with regard to the complex antiferromagnetic order known from neutron diffraction experiments on both compounds. For CeIn3, a Kondo lattice with simpler magnetic structure, only one discontinuity in α(T) occurs atT N ≃10 K.
