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Superconductivity at 25.5 K in electron-doped layered hafnium nitride

机译：电子掺杂层状氮化ha在25.5 K处的超导性

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The electronic properties of crystals with a layered structure can be radically altered by the intercalation, between the layers, of guest species that act as electron donors or acceptors. Such studies have been performed extensively on graphite, transition-metal dichalcogenides and oxide bronzes. Interest in redox intercalation reactions has increased recently because the high-transition-temperature (high-T_c) superconductors based on copper oxide also have layered structures, the superconductivity occurring within two-dimensional CuO_2 planes separated by charge-reservoir oxide layers. Similarly, in metal-doped fullerenes, which show relatively high transition temperatures, the electron donor atoms sit in the interstitial sites between adjacent fullerene balls. In a previous study, we described a layered nitride, β-ZrNCl, consisting of Zr-N double layers sandwiched between two close-packed chlorine layers. On lithium intercalation, the crystal changed from a semiconductor to a metal, and became a superconductor at 13 K. Here we report the properties of the isostruc-tural compound β-HfNCl. After electron-doping the crystal by lithium intercalation, we observe superconductivity with a T_c of up to 25.5 K. This transition temperature is higher than that observed in any intermetallic compound, and suggests that layered nitride structures may offer transition temperatures comparable to those observed in layered copper oxide structures.
机译：具有层状结构的晶体的电子性质可以通过充当电子给体或受体的客体在层之间的插入而从根本上改变。这类研究已在石墨，过渡金属二卤化物和氧化青铜上进行了广泛的研究。最近，由于基于氧化铜的高转变温度（high-T_c）超导体也具有层状结构，因此在氧化还原层间插入反应中的兴趣增加了，超导电性发生在由电荷储层氧化物层隔开的二维CuO_2平面内。类似地，在显示相对较高的转变温度的金属掺杂的富勒烯中，电子给体原子位于相邻的富勒烯球之间的间隙位置。在先前的研究中，我们描述了一种层状氮化物β-ZrNCl，它由夹在两个密排氯层之间的Zr-N双层组成。嵌入锂后，晶体从半导体变为金属，并在13 K下变成超导体。在这里，我们报道了同构-结构化合物β-HfNCl的性质。在通过锂嵌入电子掺杂晶体后，我们观察到超导性，T_c高达25.5K。该转变温度高于任何金属间化合物中观察到的转变温度，并表明层状氮化物结构可能提供的转变温度可与在C中观察到的转变温度相媲美。层状氧化铜结构。

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