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Quaternary Heusler Compounds without Inversion Symmetry: CoFe 1+ x Ti 1– x Al and CoMn 1+ x V 1– x Al
Author(s) -
Basit Lubna,
Fecher Gerhard H.,
Chadov Stanislav,
Balke Benjamin,
Felser Claudia
Publication year - 2011
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201100002
Subject(s) - valence electron , chemistry , crystallography , ferrimagnetism , valence (chemistry) , magnetic moment , ferromagnetism , transition metal , main group element , ground state , heusler compound , electron , condensed matter physics , electronic structure , metal , crystal structure , magnetization , physics , atomic physics , computational chemistry , magnetic field , quantum mechanics , biochemistry , organic chemistry , catalysis
Abstract We report the quaternary Heusler compound derivatives CoFe 1+ x Ti 1– x Al and CoMn 1+ x V 1– x Al, which do not have centers of inversion. Classical T 2 T′M (T, T′ = transition metal, M = main group element) Heusler compounds (prototype: Cu 2 MnAl) crystallize in the L 2 1 structure, space group Fm $\bar {3}$ m (225) that exhibits a center of inversion. Replacing one of the T 2 atoms by another transition element (T″) results in a quaternary TT′T″M compound with F $\bar {4}$ 3 m symmetry (Y; structure type LiMgPdSn) without center of inversion. In the case of “quasi closed shell” compounds with 24 valence electrons in the primitive cell, one expects the absence of ferromagnetism according to the Slater–Pauling rule. Increasing the number of valence electrons will allow a study of the onset of the magnetic ground state. In this work, CoFeTiAl and isovalent CoMnVAl as well as the accompanying solid solutions CoFe 1+ x Ti 1– x Al and CoMn 1+ x V 1– x Al were synthesized and their structure and magnetic properties investigated. CoMn 1+ x V 1– x Al ( x > 0) is a half‐metallic ferrimagnet in which the magnetic ground state is controlled by the strong localized moment at the Mn atoms replacing V.