Superconducting Sweet-Spot in Microcrystalline Graphite Revealed by Point-Contact Spectroscopy

被引：24
|
作者：
Arnold, F. [1 ]
Nyeki, J. [1 ]
Saunders, J. [1 ]
机构：
[1] Royal Holloway Univ London, Egham Hill, Egham TW20 0EX, Surrey, England
来源：
JETP LETTERS | 2018年 / 107卷 / 09期
基金：
英国工程与自然科学研究理事会;
关键词：
MAGNETIC-FIELD DEPENDENCE; ENERGY-GAP; GRAPHENE; FILMS;
D O I：
10.1134/S0021364018090023
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
In this letter, we describe the observation of a magnetic field dependent electronic gap, suggestive of local superconductivity, in the point-contact spectrum of microcrystalline graphite. Magnetic field dependent point-contact spectroscopy has been carried out at a temperature of 1.8 K using an etched aluminum tip. At zero field, a gap structure in the differential conductance is observed, showing a gap of Delta = 4.2 meV. On applying magnetic fields of up to 500 mT, this gap gradually closes, following the theoretical prediction by Ginzburg and Landau for a fully flux-penetrated superconductor. By applying BCS-theory, we infer a critical superconducting temperature of 14 K.
引用
收藏
页码：577 / 578
页数：2
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