Metallic phase in stoichiometric CeOBiS(2) revealed by space-resolved ARPES.

Metallic phase in stoichiometric CeOBiS(2) revealed by space-resolved ARPES.
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DOI:
10.1038/s41598-018-20351-y
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发表时间:
2018-01-31
期刊:
影响因子:
4.6
通讯作者:
Saini NL
Saini NL
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Sugimoto T;Paris E;Wakita T;Terashima K;Yokoya T;Barinov A;Kajitani J;Higashinaka R;Matsuda TD;Aoki Y;Mizokawa T;Saini NL

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最近发现没有任何氟掺杂的CeOBiS_2体系表现出超导电性,对其起源提出了质疑。使用空间分辨ARPES,我们发现了一个金属相嵌入在形态缺陷和化学计量比CeOBiS2的样品边缘。虽然大部分样品是半导体的,但嵌入的金属相的特征在于在X点处的通常的电子袋,类似于掺杂的BiS2基超导体的费米表面。所观察到的金属域的典型尺寸大于超导相关长度的系统表明,所观察到的超导性在未掺杂的CeOBiS2可能是由于这种嵌入的金属相的缺陷。研究结果还提出了一种可能的方法来开发新的系统,通过操纵这些硫属化合物的结构不稳定性的缺陷。
Recently CeOBiS2 system without any fluorine doping is found to show superconductivity posing question on its origin. Using space resolved ARPES we have found a metallic phase embedded in the morphological defects and at the sample edges of stoichiometric CeOBiS2. While bulk of the sample is semiconducting, the embedded metallic phase is characterized by the usual electron pocket at X point, similar to the Fermi surface of doped BiS2-based superconductors. Typical size of the observed metallic domain is larger than the superconducting correlation length of the system suggesting that the observed superconductivity in undoped CeOBiS2 might be due to this embedded metallic phase at the defects. The results also suggest a possible way to develop new systems by manipulation of the defects in these chalcogenides with structural instability.
DOI: 10.1038/srep05592
发表时间: 2014-07-07
期刊: Scientific reports
影响因子: 4.6
作者:
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