Details
| Original language | English |
|---|---|
| Article number | 044711 |
| Journal | Review of scientific instruments |
| Volume | 94 |
| Issue number | 4 |
| Early online date | 26 Apr 2023 |
| Publication status | Published - Apr 2023 |
Abstract
Vortex dynamics has attracted tremendous attention for both fundamental physics and applications of type-II superconductors. However, methods to detect local vortex motion or vortex jump with high sensitivity are still scarce. Here, we fabricated soft point contacts on the clean layered superconductor 2H-NbSe2, which are demonstrated to contain multiple parallel micro-constrictions by scanning electronic microscopy. Andreev reflection spectroscopy was then studied in detail for the contacts. Differential conductance taken at fixed bias voltages was discovered to vary spontaneously over time in various magnetic fields perpendicular to the sample surface. The conductance variations become invisible when the field is zero or large enough, or parallel to the sample surface, which can be identified as the immediate consequence of vortex motion across a finite number of micro-constrictions. These results demonstrate point contact Andreev reflection spectroscopy to be a new potential way with a high time resolution to study the vortex dynamics in type-II superconductors.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Instrumentation
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In: Review of scientific instruments, Vol. 94, No. 4, 044711, 04.2023.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - A new methodology for studying vortex dynamics based on point-contact spectroscopy
AU - Hu, Xiaomei
AU - Zhang, Fan
AU - Hou, Xingyuan
AU - Dong, Qingsong
AU - Wang, Suofu
AU - Han, Tao
AU - Cheng, Lixun
AU - Cheng, Feng
AU - Ge, Binghui
AU - Long, Mingsheng
AU - Ding, Fei
AU - Zhu, Xiangde
AU - Shan, Lei
N1 - Funding Information: We thank Professor C. Ren for the fruitful discussions. This work was financially supported by the National Key R&D Program of China (Grant Nos. 2022YFA1403203, 2018YFA0305602, and 2017YFA0302904), the National Natural Science Foundation of China (Grant Nos. 12074002 and 11804379), and the Major Basic Program of the Natural Science Foundation of Shandong Province (Grant No. ZR2021ZD01).
PY - 2023/4
Y1 - 2023/4
N2 - Vortex dynamics has attracted tremendous attention for both fundamental physics and applications of type-II superconductors. However, methods to detect local vortex motion or vortex jump with high sensitivity are still scarce. Here, we fabricated soft point contacts on the clean layered superconductor 2H-NbSe2, which are demonstrated to contain multiple parallel micro-constrictions by scanning electronic microscopy. Andreev reflection spectroscopy was then studied in detail for the contacts. Differential conductance taken at fixed bias voltages was discovered to vary spontaneously over time in various magnetic fields perpendicular to the sample surface. The conductance variations become invisible when the field is zero or large enough, or parallel to the sample surface, which can be identified as the immediate consequence of vortex motion across a finite number of micro-constrictions. These results demonstrate point contact Andreev reflection spectroscopy to be a new potential way with a high time resolution to study the vortex dynamics in type-II superconductors.
AB - Vortex dynamics has attracted tremendous attention for both fundamental physics and applications of type-II superconductors. However, methods to detect local vortex motion or vortex jump with high sensitivity are still scarce. Here, we fabricated soft point contacts on the clean layered superconductor 2H-NbSe2, which are demonstrated to contain multiple parallel micro-constrictions by scanning electronic microscopy. Andreev reflection spectroscopy was then studied in detail for the contacts. Differential conductance taken at fixed bias voltages was discovered to vary spontaneously over time in various magnetic fields perpendicular to the sample surface. The conductance variations become invisible when the field is zero or large enough, or parallel to the sample surface, which can be identified as the immediate consequence of vortex motion across a finite number of micro-constrictions. These results demonstrate point contact Andreev reflection spectroscopy to be a new potential way with a high time resolution to study the vortex dynamics in type-II superconductors.
UR - http://www.scopus.com/inward/record.url?scp=85158169756&partnerID=8YFLogxK
U2 - 10.1063/5.0138882
DO - 10.1063/5.0138882
M3 - Article
AN - SCOPUS:85158169756
VL - 94
JO - Review of scientific instruments
JF - Review of scientific instruments
SN - 0034-6748
IS - 4
M1 - 044711
ER -