Physical properties and magnetic structure of a layered antiferromagnet PrPd 0.82 Bi 2

We report the physical properties, crystalline and magnetic structures of singe crystals of a new layered antiferromagnetic (AFM) material PrPd0.82Bi2. The measurements of magnetic properties and heat capacity indicate an AFM phase transition atT(N)similar to 7 K. A large Sommerfeld coefficient of 329.23 mJ.mol(-1).K(-2)is estimated based on the heat capacity data, implying a possible heavy-fermion behavior. The magnetic structure of this compound is investigated by a combined study of neutron powder and single-crystal diffraction. It is found that an A-type AFM structure with magnetic propagation wavevectork= (0 0 0) is formed belowT(N). The Pr(3+)magnetic moment is aligned along the crystallographicc-axis with an ordered moment of 1.694(3)mu(B)at 4 K, which is smaller than the effective moment of the free Pr(3+)ion of 3.58 mu(B). PrPd(0.82)Bi(2)can be grown as large as 1 mmx1 cm in area with a layered shape, and is very easy to be cleaved, providing a unique opportunity to study the interplay between magnetism, possible heavy fermions, and superconductivity.