Open AccessCrystal structure and physical properties of new transition metal based pnictide compounds: LaTM2AsN (TM = Fe, Co, and Ni)
Author(s) -
Sehoon Jeong,
Satoru Matsuishi,
Joonho Bang,
Hideo Hosono
Publication year - 2015
Publication title -
apl materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.571
H-Index - 60
ISSN - 2166-532X
DOI - 10.1063/1.4913395
Subject(s) - pnictogen , materials science , orthorhombic crystal system , crystal structure , crystallography , superconductivity , condensed matter physics , ferromagnetism , electrical resistivity and conductivity , transition metal , lattice (music) , anisotropy , tetrahedron , metal , space group , x ray crystallography , diffraction , chemistry , biochemistry , physics , engineering , quantum mechanics , acoustics , electrical engineering , metallurgy , catalysis , optics
New 3d transition metal-based mixed-pnictide compounds, LaTM2AsN (TM = Fe, Co, and Ni) are synthesized by solid state reactions under a high pressure of 2.5 GPa. These compounds crystallize with an orthorhombic structure (space group Cmcm) containing four formula units per unit cell. The crystal structure consists of an anisotropic network of TMAs3N tetrahedra sharing As-As edges along the in-plane ac direction and N corners along the b-direction, forming a TM honeycomb lattice with a boat-shape conformation bridged by TM-N-TM linear bonds. The temperature dependences of the electrical resistivity and magnetic susceptibility indicate that these crystals are itinerant antiferromagnets exhibiting parasitic ferromagnetism with transition temperatures of 560, 260, and 410 K for TM = Fe, Co, and Ni, respectively. These compounds are expected to be parent materials for new superconductors
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