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Bulk and surface sp half-metallic ferromagnetism in alkali metal pnictides with rocksalt structure: a first-principles calculation

机译:具有岩盐结构的碱金属Pnictides中的体表sp半金属铁磁性:第一性原理计算

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Recently, sp half-metallic ferromagnetism in alkali metal/alkaline earth pnictides (I/II-V) with zinc blende structure was predicted by first-principles calculations (Sieberer et al 2006 Phys. Rev. B 73 024404). To search for half-metallic ferromagnets with a more stable structure in alkali metal pnictides MX ( M = Li, Na, K; X = N, P, As), we apply here first-principles all-electron and pseudopotential-method-based density functional theory to investigate the electronic and magnetic properties of these compounds with rocksalt structure. Five rocksalt compounds are found to be half-metallic ferromagnets with a magnetic moment of 2.00 mu(B)/f.u., and they are more stable energetically than the ones with zinc blende structure, which makes them more promising candidates for the possible growth of half-metallic films or ultrathin films on suitable semiconductor substrates. Furthermore, we show that both lithium- and nitrogen- terminated ( 111) surfaces of rocksalt lithium nitride retain the bulk half-metallic characteristic, and the surface atomic magnetic moments are enhanced compared to the bulk values.
机译:近来,通过第一性原理计算预测了具有锌共混物结构的碱金属/碱土金属离子化物(I / II-V)中的sp半金属铁磁性(Sieberer等人2006 Phys.Rev.B 73 024404)。为了在碱金属金属氧化物MX(M = Li,Na,K; X = N,P,As)中寻找结构更稳定的半金属铁磁体,我们在此应用基于第一原理的全电子和伪势方法密度泛函理论研究这些具有岩石盐结构的化合物的电子和磁性。发现有五种岩盐化合物是半金属铁磁体,磁矩为2.00μ(B)/ fu,与具有锌混合结构的化合物相比,它们在能量上更稳定,这使它们成为可能生长半峰的候选材料。 -在合适的半导体衬底上的金属膜或超薄膜。此外,我们表明,岩盐氮化锂的锂和氮封端的(111)表面都保留了整体半金属特性,并且与整体值相比,表面原子磁矩得到了增强。

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