Sun Z, Wang Q, Douglas J F, Lin H, Sahrakorpi S, Barbiellini B, Markiewicz R S, Bansil A, Fedorov A V, Rotenberg E, Zheng H, Mitchell J F, Dessau D S
1] Department of Physics, University of Colorado, Boulder, CO 80309, USA [2] National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, P. R. China.
Sci Rep. 2013 Nov 7;3:3167. doi: 10.1038/srep03167.
A half-metal is a material with conductive electrons of one spin orientation. This type of substance has been extensively searched for due to the fascinating physics as well as the potential applications for spintronics. Ferromagnetic manganites are considered to be good candidates, though there is no conclusive evidence for this notion. Here we show that the ferromagnet La2-2xSr1+2xMn2O7 (x = 0.38) possesses minority-spin states, challenging whether any of the manganites may be true half-metals. However, when electron transport properties are taken into account on the basis of the electronic band structure, we found that the La2-2xSr1+2xMn2O7 (x = 0.38) can essentially behave like a complete half metal.
半金属是一种具有单一自旋取向导电电子的材料。由于其迷人的物理特性以及在自旋电子学方面的潜在应用，这种类型的物质已被广泛研究。铁磁锰氧化物被认为是很好的候选材料，尽管尚无确凿证据支持这一观点。在此我们表明，铁磁体La2-2xSr1+2xMn2O7（x = 0.38）具有少数自旋态，这对是否存在任何真正的半金属锰氧化物提出了质疑。然而，当基于电子能带结构考虑电子输运性质时，我们发现La2-2xSr1+2xMn2O7（x = 0.38）基本上可以表现得像一个完整的半金属。
