1995 Volume 64 Issue 10 Pages 3941-3945
We have studied the magnetic phase diagrams of the dense Kondo compounds CeB6 and Ce0.5La0.5B6 by use of low temperature ultrasonic measurements. A transition associated with a quadrupolar reorientation has clearly been observed around 1, kOe in the antiferroquadrupolar phase II of CeB6. In the paramagnetic phase I of Ce0.5La0.5 B6 a crossover from the ordinaly Γ8 ground state to the Kondo singlet state has been found. The field induced transition from the Kondo singlet state to the antiferromagnetic phase III or the phase II has been found at a critical field 17, kOe. The field angle dependence of the phase diagram of Ce0.5La0.5B6 is also presented.
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