Electron doping in the honeycomb bilayer superconductors (Zr, Hf)NCl
Electron doping in the honeycomb bilayer superconductors (Zr, Hf)NCl
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DOI：
10.1209/epl/i1999-00484-4
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发表时间：
1999-11-01
期刊：
影响因子：
--
通讯作者：
Pickett, WE
中科院分区：
文献类型：
--
作者：
Weht, R;Filippetti, A;Pickett, WE
基于虚拟晶体处理，我们表明碱掺杂将电子载流子引入到 LixZrNCl 和 NaxHfNCl（其超导 T-c 高达 25 K）中的单个轻质量（m* = 0.6）、低态密度带中，这是 d(xy)、d(x2-y2) 特征的对称层间组合。掺杂导致简单的 K 中心三重对称圆柱形费米表面，将低能散射集中到不同的动量区域。缺乏任何观察到的磁倾向。结合我们对小电子声子强度的计算，提出了一种与已知超导体不同的配对机制。
Based on a virtual crystal treatment, we show that alkali doping introduces electron carriers into a single light mass (m* = 0.6), low density of states band in LixZrNCl and NaxHfNCl (which have superconducting T-c up to 25 K) that is a symmetric interlayer combination of d(xy),d(x2-y2) character. Doping leads to simple K-centered three-fold symmetrical cylindrical Fermi surfaces that concentrate low-energy scattering into distinct regions of momentum. The lack of any observed magnetic tendencies. together with our calculation of small electron-phonon strength, suggests a pairing mechanism that is distinct from known superconductors.