论文信息 - Crystal structures and magnetic properties of cobalt chalcogenides BaLa2Co(S1 − xSex)5 (0.0 ≤ x ≤ 0.4)

Crystal structures and magnetic properties of cobalt chalcogenides BaLa2Co(S1 − xSex)5 (0.0 ≤ x ≤ 0.4)

We have investigated crystal structures and magnetic properties of cobalt chalcogenides BaLa2Co(S1 − xSex)5 (0.0 ≤ x ≤ 0.4). This system has a tetragonal crystal structure with the space group I4/mcm. The lattice constants a and c increase linearly with Se content x. The temperature dependence of the magnetic susceptibilities of BaLa2Co(S1 − xSex)5 shows that the antiferromagnetic transition temperature (63–65 K) increases and the magnetic moment of Co2+ decreases with increasing x. Their specific heat shows the decrease of the Debye temperatures with increasing x. The neutron diffraction data collected at 10 K for BaLa2CoS5 indicate that the Co2+ ions have a collinear antiferromagnetic structure with an ordered moment of 3.56 μB. The magnetic moments lie in a parallel direction with the c-axis.

Y. Morii | Y. Ishii | Y. Hinatsu | M. Wakeshima | Y. Shimojo

[1] Y. Hinatsu,et al. Synthesis and crystal structure of new quaternary sulfides BaLn2FeS5(Ln = La, Ce, Pr, Nd, Sm) , 2001 .

[2] Y. Hinatsu,et al. Magnetic properties of a quaternary iron sulfide BaLa2FeS5 , 2001 .

[3] H. Mollymoto,et al. Magnetization of Co(SxSe1-x)2 under High Magnetic Field Up to 500 kOe , 1979 .

[4] K. Adachi,et al. Further Investigations on Magnetic Properties of Co(SxSe1-x)2, (0≤x≤1) , 1979 .

[5] Y. Morii,et al. Crystal and magnetic structures of the antiferromagnetic manganese sulfide BaLa2MnS5 by powder neutron diffraction measurements , 2000 .