NUCLEAR-MAGNETIC-RESONANCE ON IN-115 IN AUIN2 AT VERY-LOW TEMPERATURES

To investigate possible nuclear magnetic ordering phenomena we have pe rformed pulsed NMR measurements on In-115 in AuIn2 in magnetic fields of 7 mT < B < 114 mT and in the temperature range between 0.03 mK < T < 5 mK. With decreasing temperature we notice a dramatic shortening of the effective spin-spin relaxation time tau2+ by more than one order of magnitude, which depends exponentially on nuclear polarization. We observe a Curie-Weiss law for the nuclear magnetization with theta > 0 . However below a certain temperature, depending on the external magne tic field the magnetization remains constant.