arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1301.6367cond-mat.mtrl-scicond-mat.mes-hall
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半Heusler合金LiMnZ(Z=N,P,Si)的自旋性质和稳定性

Spintronic properties and stability of the half-Heusler alloys LiMnZ (Z=N, P, Si)

L. Damewood, B. Busemeyer, M. Shaughnessy, C. Y. Fong, L. H. Yang, C. Felser

摘要:

锂基半Heusler合金由于其在光电子学中的潜在应用以及在自旋电子学应用中表现出大磁矩的可能性而引起了人们的广泛关注。由于半Heusler合金$β$ -LiMnZ(Z = N、P和Si)与亚稳态锌锰半金属的相似性,系统地研究了半Heusler合金在优化晶格常数和应变晶格常数下的电、磁和稳定性,显示出半金属性质。半赫斯勒结构的其他相($α$和$γ$)也在这里报道,但它们不太可能生长。当Z = Si时,这些稳定的Li基合金的磁矩预计高达每晶胞4 $μ_{\mathrm{B}}$,当Z = N和P时,每晶胞5 $μ_{\mathrm{B}}$,然而,当Z是氮族元素时,反铁磁自旋构型在能量上是有利的。$β$ -LiMnSi的晶格常数比其平衡晶格常数大14%,由于其大的磁矩和振动稳定性,是一种有前途的自旋电子学应用半金属。确定了这些合金的修正斯莱特-鲍林规则。最后,一个合理的方法,用于开发半金属锂$_x$ MnZ在平衡状态下,通过调整$x$,进行了研究,但是,不同于四方化,这种类型的合金化引入局部结构的变化,破坏了半金属性。

英文摘要:

Li-based half-Heusler alloys have attracted much attention due to their potential applications in optoelectronics and because they carry the possibility of exhibiting large magnetic moments for spintronic applications. Due to their similarities to metastable zinc blende half-metals, the half-Heusler alloys $β$-LiMnZ (Z = N, P and Si) were systematically examined for their electric, magnetic and stability properties at optimized lattice constants and strained lattice constants that exhibit half-metallic properties. Other phases of the half-Heusler structure ($α$ and $γ$) are also reported here, but they are unlikely to be grown. The magnetic moments of these stable Li-based alloys are expected to reach as high as 4 $μ_{\mathrm{B}}$ per unit cell when Z = Si and 5 $μ_{\mathrm{B}}$ per unit cell when Z = N and P, however the antiferromagnetic spin configuration is energetically favored when Z is a pnictogen. $β$-LiMnSi at a lattice constant 14\% larger than its equilibrium lattice constant is a promising half-metal for spintronic applications due to its large magnetic moment and vibrational stability. The modified Slater--Pauling rule for these alloys is determined. Finally, a plausible method for developing half-metallic Li$_x$MnZ at equilibrium, by tuning $x$, is investigated, but, unlike tetragonalization, this type of alloying introduces local structural changes that destroy the half-metallicity.

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