微量Se取代对FeS热电性和电子关联的增强
Thermoelectricity and electronic correlations enhancement in FeS by slight Se substitution
摘要：
我们报道了FeS $_{1-x}$ Se $_x$（$x$ = 0，0.06）超导单晶的热电研究，该超导单晶具有高的不可逆场和临界电流密度$J_c$，可与具有高得多的超导临界温度的材料（$T_c$ 's）相媲美。$T_c$与费米温度$T_F$的比值非常小，表明电子关联很弱。在FeS中的硫位上有少量的硒取代，$T_c$ / $T_F$和有效质量$m^*$都显著增加，这意味着体导电态的电子相关性增加。第一性原理计算表明，与FeS相比，FeS $_{0.94}$ Se $_{0.06}$的费米能级上的态密度增加，这不仅与Fe有关，而且与硫属元素衍生的电子态有关.
英文摘要：
We report thermoelectric studies of FeS$_{1-x}$Se$_x$ ($x$ = 0, 0.06) superconducting single crystals that feature high irreversibility fields and critical current density $J_c$ comparable to materials with much higher superconducting critical temperatures ($T_c$'s). The ratio of $T_c$ to the Fermi temperature $T_F$ is very small indicating weak electronic correlations. With a slight selenium substitution on sulfur site in FeS both $T_c$/$T_F$ and the effective mass $m^*$ rise considerably, implying increase in electronic correlation of the bulk conducting states. The first-principle calculations show rise of the density of states at the Fermi level in FeS$_{0.94}$Se$_{0.06}$ when compared to FeS which is related not only to Fe but also to chalcogen-derived electronic states.
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