Abstract
Superconductor thin films with full or partial regular triangular hole arrays have been fabricated to explore the vortex pinning behavior. Electron beam lithography and reaction dry etching techniques have been used. The area of the regular square hole arrays is changed from 50umx50um for sample Ato 50umx5um for samples B and C, and the area of the superconducting film remains the same. Magnetotransport measurements were carried out by a four-probe technique. Periodic critical current matching peaks are observed for all three samples. The small area hole arrays and their neighboring normal superconducting film without holes form heterostructure and novel pinning phenomena are observed. At certain temperatures, sample A has five matching peaks. However, samples B and C have two and one matching peaks, respectively. A strange phenomenon is observed that a negative resistance appears for the heterostructure films at zero field.
| Original language | English |
|---|---|
| Article number | 052030 |
| Journal | Journal of Physics: Conference Series |
| Volume | 150 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 2009 Jan 1 |
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All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
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Novel pinning phenomena in Nb thin films with the heterostructure pinning arrays. / Cao, R.; Yang, T. J.; Wu, T. C.; Horng, Lance.
In: Journal of Physics: Conference Series, Vol. 150, No. 5, 052030, 01.01.2009.Research output: Contribution to journal › Article
TY - JOUR
T1 - Novel pinning phenomena in Nb thin films with the heterostructure pinning arrays
AU - Cao, R.
AU - Yang, T. J.
AU - Wu, T. C.
AU - Horng, Lance
PY - 2009/1/1
Y1 - 2009/1/1
N2 - Superconductor thin films with full or partial regular triangular hole arrays have been fabricated to explore the vortex pinning behavior. Electron beam lithography and reaction dry etching techniques have been used. The area of the regular square hole arrays is changed from 50umx50um for sample Ato 50umx5um for samples B and C, and the area of the superconducting film remains the same. Magnetotransport measurements were carried out by a four-probe technique. Periodic critical current matching peaks are observed for all three samples. The small area hole arrays and their neighboring normal superconducting film without holes form heterostructure and novel pinning phenomena are observed. At certain temperatures, sample A has five matching peaks. However, samples B and C have two and one matching peaks, respectively. A strange phenomenon is observed that a negative resistance appears for the heterostructure films at zero field.
AB - Superconductor thin films with full or partial regular triangular hole arrays have been fabricated to explore the vortex pinning behavior. Electron beam lithography and reaction dry etching techniques have been used. The area of the regular square hole arrays is changed from 50umx50um for sample Ato 50umx5um for samples B and C, and the area of the superconducting film remains the same. Magnetotransport measurements were carried out by a four-probe technique. Periodic critical current matching peaks are observed for all three samples. The small area hole arrays and their neighboring normal superconducting film without holes form heterostructure and novel pinning phenomena are observed. At certain temperatures, sample A has five matching peaks. However, samples B and C have two and one matching peaks, respectively. A strange phenomenon is observed that a negative resistance appears for the heterostructure films at zero field.
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U2 - 10.1088/1742-6596/150/5/052030
DO - 10.1088/1742-6596/150/5/052030
M3 - Article
AN - SCOPUS:77952481312
VL - 150
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
SN - 1742-6588
IS - 5
M1 - 052030
ER -