R6sume.-Des experiences de refroidissement par dgsaimentation nucleaire renforc6e sur un monocristal de HoV04 sont d6crites. La temperature minimum atteinte est d'environ I mK. L'ordre anti-ferromagnetique du systSme des spEns nucleaires renforces a et6 obser-v6 avec une tempdrature de NLel TN = 4 , s mK. Nous avons observe une transition spin-flip dans un champ magn6tique applique de 140 gauss. Abstract.-Enhanced nuclear cooling experiments on a single crystal of HoVOL, are reported. The minimum temperature reached was about I mK. Antiferromagnetic ordering of the enhanced nuclear spin was observed with a Ndel temperature T = 4.5 mK. A spin-flip transition was observed in an applied magnetic induction of about r40 gauss.
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