Abstract
Ce 3Al 11 is a Kondo compound with two magnetic phases below 6.2 K: a ferromagnetic one and at lower temperatures a modulated and incommensurate one. The stability of the modulated structure at T = 1.5 K, compared to the ferromagnetic one, is quite unusual. A competition between magnetic interactions and Kondo effects can explain the moment reduction. It is important to check whether the modulation persists at lower temperatures. New experiments have been performed on D10 (ILL) with a dilution cryostat designed for a 4-circle apparatus: at 300 mK the modulation of moments is still present and the structure remains incommensurate.
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