Chemical Bonding And Electronic And Magnetic Structure In Laofeas

摘要

The recent work by Kamihara et al. reporting a superconducting transition at 26 K in the Fe-based La[O_(1-x)F_x]FeAs (x = 0.12, electron doping), which increases up to 43 K under 4 GPa pressure, has renewed the interest in high critical temperature (T_c, HTC) superconductivity. Almost immediately after this discovery, Wen et al. reported superconductivity at 25 K in the [La_(1-x)Sr_x]OFeAs material (x = 0.13, hole doping). The reported phase diagrams show similarities to the cuprate materials and potentially provide an interesting link between HTC in both classes of materials. Higher and higher T_c values are rapidly emerging reaching T_c = 52 K in PrO_(1-x)F_xFeAs.