Stability and half-metallicity of the (001) and (111) surfaces of CrTe with rocksalt structure

Stability and half-metallicity of the (001) and (111) surfaces of CrTe with rocksalt structure
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岩盐结构CrTe(001)和(111)表面的稳定性和半金属性

DOI:
10.1063/1.4767232
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发表时间:
2012-11
影响因子:
3.2
通讯作者:
Yao, K.L.
Yao, K.L.
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Gao, G.Y.;Yao, Wei;Han, H.P.;Al-zyadi, J. M. Khalaf;Yao, K.L.

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本文扩展了近年来块状岩盐CrTe [Y]室温以上半金属铁磁性的研究。Liu, S. K. Bose, and J. J. Kudrnovský,物理学。Rev. B 82, 094435(2010)]用第一性原理计算得到(001)和(111)曲面。结果表明,te端(111)表面在整个有效Cr化学势上比(001)和Cr端(111)表面能量更稳定,岩盐CrTe的te端(111)表面的表面稳定性与实验锌-闪锌矿CrTe的te端(001)表面的表面稳定性相当。此外,岩盐CrTe的(001)和(111)表面都保留了大块半金属丰度。由于(111)表面的Cr-Te键被击破,(111)表面的原子磁矩与块状岩盐CrTe表面的原子磁矩差异很大,而(001)表面的原子磁矩差异很小,因为(001)表面存在Cr-Te键。这些结果表明,制备除混锌结构外具有岩盐结构的半金属CrTe薄膜是可行的。
We extend the recent study on above-room-temperature half-metallic ferromagnetism in bulk rocksalt CrTe [Y. Liu, S. K. Bose, and J. J. Kudrnovský, Phys. Rev. B 82, 094435 (2010)] to the (001) and (111) surfaces by using the first-principles calculations. We show that the Te-terminated (111) surface is energetically more stable than both the (001) and the Cr-terminated (111) surfaces over the whole effective Cr chemical potential, and the surface stability of the Te-terminated (111) surface of rocksalt CrTe is comparable with that of the Te-terminated (001) surface of experimental zinc-blende CrTe. In addition, both the (001) and (111) surfaces of rocksalt CrTe retain the bulk half-metallicity. The atomic magnetic moments at the (111) surfaces are greatly different from those in the bulk rocksalt CrTe due to the breakdown of Cr-Te bond at the (111) surface, but the differences are very small for the case of the (001) surface due to the existence of Cr-Te bond at the (001) surface. These results indicate that it is feasible to fabricate the half-metallic CrTe thin films with rocksalt structure other than zinc-blende one.
五种过渡金属硫属化物中半金属铁磁性的第一性原理预测:以岩盐结构为例
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