Role of the dimensionality of the [GaX]2 network in the Zintl phases EuGa2X2
KAUST DepartmentPhysical Sciences and Engineering (PSE) Division
Computational Physics and Materials Science (CPMS)
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AbstractThe structural, electronic, magnetic, optical, and thermoelectric properties of EuGa2X2 (X = P, As, and Sb) are investigated using first principles calculations (taking into account the onsite Coulomb interaction) and the semi-classical Boltzmanntheory. The divalent nature of Eu fulfils the Zintl principle as is confirmed by the calculated total magnetic moments of ∼7 μB. A metallic behavior is obtained for all compounds. The optical spectra originate mainly from the transitions between occupied Eu 4f states and unoccupied Eu 5d states. It is demonstrated that the two-dimensional [Ga(P/As)]2 network in EuGa2P2 and EuGa2As2 is favorable for thermoelectric applications as compared to the three-dimensional [GaSb]2 network in EuGa2Sb2.
CitationSingh N, Pöttgen R, Schwingenschlögl U (2012) Role of the dimensionality of the [GaX]2 network in the Zintl phases EuGa[sub 2]X[sub 2]. Journal of Applied Physics 112: 103714. doi:10.1063/1.4767363.
JournalJournal of Applied Physics