High temperature superconductivity in distinct phases of amorphous B-doped Q-carbon
High temperature superconductivity in distinct phases of amorphous B-doped Q-carbon
复制标题
非晶B掺杂Q-碳不同相的高温超导
DOI：
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
R. Sachan
中科院分区：
文献类型：
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作者：
J. Narayan;A. Bhaumik;R. Sachan
在对碳进行纳秒激光熔化和淬火后，当掺硼和未掺硼的金刚石四面体随机堆积时，会形成不同相的掺硼Q - 碳。通过改变掺杂与未掺杂四面体的比例，可以产生浓度从5.0%到50.0%的不同相的掺硼Q - 碳。我们已经合成了三种不同相的非晶态掺硼Q - 碳，它们按照巴丁 - 库珀 - 施里弗机制呈现出高温超导性。第一相（QB1）的硼浓度约为17原子%（临界温度Tc = 37 K），第二相（QB2）的硼浓度约为27原子%（临界温度Tc = 55 K），第三相（QB3）的硼浓度约为45原子%（预期临界温度Tc超过100 K）。通过几何建模，我们推导出QB1由随机堆积的四面体组成，其中每三个四面体中有一个在中心含有一个硼原子，该硼原子以sp3杂化方式与四个碳原子键合，浓度为16.6原子%。QB2由随机堆积的四面体组成，其中每两个四面体中有一个……
Distinct phases of B-doped Q-carbon are formed when B-doped and undoped diamond tetrahedra are packed randomly after nanosecond laser melting and quenching of carbon. By changing the ratio of doped to undoped tetrahedra, distinct phases of B-doped Q-carbon with concentration varying from 5.0% to 50.0% can be created. We have synthesized three distinct phases of amorphous B-doped Q-carbon, which exhibit high-temperature superconductivity following the Bardeen-Cooper-Schrieffer mechanism. The first phase (QB1) has a B-concentration ∼17 at. % (Tc = 37 K), the second phase (QB2) has a B-concentration ∼27 at. % (Tc = 55 K), and the third phase (QB3) has a B-concentration ∼45 at. % (Tc expected over 100 K). From geometrical modeling, we derive that QB1 consists of randomly packed tetrahedra, where one out of every three tetrahedra contains a B atom in the center which is sp3 bonded to four carbon atoms with a concentration of 16.6 at. %. QB2 consists of randomly packed tetrahedra, where one out of every two tet...
影响因子：
5.9
作者：
Bhaumik, Anagh;Nori, Sudhakar;Narayan, Jagdish
通讯作者：
Narayan, Jagdish
影响因子：
8.6
作者：
Valla, T.;Camacho, J.;Ellerby, M.
通讯作者：
Ellerby, M.