Abstract
The cubic intermetallic compound PrPb 3 is considered to exhibit an antiferro-quadrupolar (AFQ) ordering at T Q = 0.4 K . We have performed neutron diffraction experiments on PrPb 3 in order to detect a possible induced antiferromagnetic (AFM) moment in the AFQ phase. At T = 40 mK , a small magnetic reflection q = ( 1 2 δ δ ) with δ = 0.062 is observed above 3 T. The emergence of the magnetic reflection is accompanied by a large hysteresis, implying the transition to be of first order. The direction of the AFM component ( | | [ 1 1 0 ] ) suggests an underlying AFQ order of O 2 2 type.
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