Abstract
Magnetic and neutron diffraction measurements have been performed onTbPtGe2 at low temperatures. The compound crystallizes in theorthorhombic YIrGe2-type structure (space group Immm);crystal structure parameters have been refined on the basis of theneutron diffraction pattern collected at T = 30.7 K (paramagneticregion). TbPtGe2 is antiferromagnetic below TN = 24.2 K.Below this temperature only one of the two Tb sublattices is ordered;the Tb magnetic moments localized at the 4(i) sites order with thesimple propagation vector k = 0. Below Tt1 = 11.4 K themagnetic moments at the other Tb sites, 4(h), show an ordering withthe propagation vector k1 = [0.2677(8),0.1312(24),0.6989(27)]. At Tt2 = 7 K a further phase transition to a newmodulated phase described by the propagation vector k2 = [0.2584(5),0,0.5895(6)] is observed.
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