CeAgAs₂ — A New Derivative of the HfCuSi₂ Type of Structure: Synthesis, Crystal Structure and Magnetic Properties.

Abstract

Type of Structure: Synthesis, Crystal Structure and Magnetic Properties. -CeAgAs 2 is prepared by solid state reaction of the elements (evacuated silica tube, 600-1000°C, 500 h) and single crystals are grown by chemical vapor transport using I 2 as transport agent (600→800°C, 150 h). CeAgAs 2 crystallizes in space group Pmca with Z = 8 and represents a new distorted and ordered variant of the HfCuSi 2 type structure. The compound is paramagnetic and orders antiferromagnetically at 5.5. K. There is a metamagnetic transition starting at 1.8 K and 4.6 kOe. -(DEMCHYNA, R.; JEMETIO, J. P. F.; PROTS*, Y.; DOERT, T.; AKSELRUD, L. G.; SCHNELLE, W.; KUZ'MA, Y.; GRIN, Y.; Z. Anorg. Allg. Chem. 630 (2004) 5, 635-641; MPI Chem. Phys. fester Stoffe,

Various Arsenic Network Structures in 112-Type Ca1–xLaxFe1–yPdyAs2 Revealed by Synchrotron X-ray Diffraction Experiments

“…From this point of view, utilizing arsenic cis-trans chains may make it possible to produce novel 112-type high T c superconductivity. Cis-trans chains tend to prefer slightly longer lattice parameters than do the zigzag chain in LnTAs 2 30,31 (Ln: lanthanoide elements, T: 4d transition metals), suggesting that an as yet undescribed 112-type iron arsenide with cis-trans chains would require only a slight substitution of proper ions to produce superconductivity.…”