Revisiting the vortex-core tunnelling spectroscopy in YBa2Cu3O7-δ

被引：18

作者：

Bruer, Jens ^{[1
]}

Maggio-Aprile, Ivan ^{[1
]}

Jenkins, Nathan ^{[1
]}

Ristic, Zoran ^{[1
]}

Erb, Andreas ^{[2
]}

Berthod, Christophe ^{[1
]}

Fischer, Oystein ^{[1
]}

Renner, Christoph ^{[1
]}

机构：

[1] Univ Geneva, Dept Quantum Matter Phys, 24 Quai Ernest Ansermet, CH-1211 Geneva 4, Switzerland

[2] Bayer Akad Wissensch, Walther Meissner Inst, Walther Meissner Str 8, D-85748 Garching, Germany

来源：

NATURE COMMUNICATIONS | 2016年 / 7卷

基金：

瑞士国家科学基金会;

关键词：

QUASI-PARTICLE STATES; T-C SUPERCONDUCTORS; DENSITY-WAVE ORDER; ELECTRONIC-STRUCTURE; TEMPERATURE; PSEUDOGAP; EXCITATIONS; SPECTRA;

D O I：

10.1038/ncomms11139

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The observation by scanning tunnelling spectroscopy of Abrikosov vortex cores in the high-temperature superconductor YBa2Cu3O7-delta (Y123) has revealed a robust pair of electron-hole symmetric states at finite subgap energy. Their interpretation remains an open question because theory predicts a different signature in the vortex cores, characterized by a strong zero-bias conductance peak. Here, we present scanning tunnelling spectroscopy data on very homogeneous Y123 at 0.4 K revealing that the subgap features do not belong to vortices: they are actually observed everywhere along the surface with high spatial and energy reproducibility, even in the absence of magnetic field. Detailed analysis and modelling show that these states remain unpaired in the superconducting phase and belong to an incoherent channel, which contributes to the tunnelling signal in parallel with the superconducting density of states.

引用

页数：6

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