Current–voltage characteristics of Nb–carbon–Nb junctions
We report on properties of Nb(/Ti)–carbon–(Ti/)Nb junctions fabricated on graphite flakes using e-beam lithography. The devices were characterized at temperatures above 1.8 K where a Josephson current was not observed, but the differential conductivity revealed features below the critical temperatur...
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| Published in: | Физика низких температур |
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| Date: | 2014 |
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Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2014
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| Online Access: | https://nasplib.isofts.kiev.ua/handle/123456789/119426 |
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| Journal Title: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Cite this: | Current–voltage characteristics of Nb–carbon–Nb junctions / I.P. Nevirkovets, S.E. Shafranjuk, O. Chernyashevskyy, N. Masilamani, J.B. Ketterson // Физика низких температур. — 2014. — Т. 40, № 3. — С. 250-258. — Бібліогр.: 18 назв. — англ. |
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Nevirkovets, I.P. Shafranjuk, S.E. Chernyashevskyy, O. Masilamani, N. Ketterson, J.B. 2017-06-06T19:11:30Z 2017-06-06T19:11:30Z 2014 Current–voltage characteristics of Nb–carbon–Nb junctions / I.P. Nevirkovets, S.E. Shafranjuk, O. Chernyashevskyy, N. Masilamani, J.B. Ketterson // Физика низких температур. — 2014. — Т. 40, № 3. — С. 250-258. — Бібліогр.: 18 назв. — англ. 0132-6414 PACS 72.80.Vp, 74.45.+c, 74.50.+r, 74.78.Na https://nasplib.isofts.kiev.ua/handle/123456789/119426 We report on properties of Nb(/Ti)–carbon–(Ti/)Nb junctions fabricated on graphite flakes using e-beam lithography. The devices were characterized at temperatures above 1.8 K where a Josephson current was not observed, but the differential conductivity revealed features below the critical temperature of Nb, and overall metallic conductivity, in spite of a high-junctions resistance. Since the conductivity of graphite along the planes is essentially two-dimensional (2D), we use a theoretical model developed for metal/graphene junctions for interpretation of the results. The model involves two very different graphene “access” lengths. The shorter length characterizes ordinary tunneling between the three-dimensional Nb(/Ti) electrode and 2D graphene, while the second, much longer length, is associated with the Andreev reflections (AR) inside the junction and involves also “reflectionless” AR processes. The relevant transmission factors are small in the first case and much larger in the second, which explains the apparent contradiction of the observed behaviors en Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України Физика низких температур Свеpхпpоводимость, в том числе высокотемпеpатуpная Current–voltage characteristics of Nb–carbon–Nb junctions Article published earlier |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine |
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| title |
Current–voltage characteristics of Nb–carbon–Nb junctions |
| spellingShingle |
Current–voltage characteristics of Nb–carbon–Nb junctions Nevirkovets, I.P. Shafranjuk, S.E. Chernyashevskyy, O. Masilamani, N. Ketterson, J.B. Свеpхпpоводимость, в том числе высокотемпеpатуpная |
| title_short |
Current–voltage characteristics of Nb–carbon–Nb junctions |
| title_full |
Current–voltage characteristics of Nb–carbon–Nb junctions |
| title_fullStr |
Current–voltage characteristics of Nb–carbon–Nb junctions |
| title_full_unstemmed |
Current–voltage characteristics of Nb–carbon–Nb junctions |
| title_sort |
current–voltage characteristics of nb–carbon–nb junctions |
| author |
Nevirkovets, I.P. Shafranjuk, S.E. Chernyashevskyy, O. Masilamani, N. Ketterson, J.B. |
| author_facet |
Nevirkovets, I.P. Shafranjuk, S.E. Chernyashevskyy, O. Masilamani, N. Ketterson, J.B. |
| topic |
Свеpхпpоводимость, в том числе высокотемпеpатуpная |
| topic_facet |
Свеpхпpоводимость, в том числе высокотемпеpатуpная |
| publishDate |
2014 |
| language |
English |
| container_title |
Физика низких температур |
| publisher |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| format |
Article |
| description |
We report on properties of Nb(/Ti)–carbon–(Ti/)Nb junctions fabricated on graphite flakes using e-beam lithography. The devices were characterized at temperatures above 1.8 K where a Josephson current was not observed, but the differential conductivity revealed features below the critical temperature of Nb, and overall metallic conductivity, in spite of a high-junctions resistance. Since the conductivity of graphite along the planes is
essentially two-dimensional (2D), we use a theoretical model developed for metal/graphene junctions for interpretation of the results. The model involves two very different graphene “access” lengths. The shorter length
characterizes ordinary tunneling between the three-dimensional Nb(/Ti) electrode and 2D graphene, while
the second, much longer length, is associated with the Andreev reflections (AR) inside the junction and involves
also “reflectionless” AR processes. The relevant transmission factors are small in the first case and much larger
in the second, which explains the apparent contradiction of the observed behaviors
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| issn |
0132-6414 |
| url |
https://nasplib.isofts.kiev.ua/handle/123456789/119426 |
| fulltext |
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| citation_txt |
Current–voltage characteristics of Nb–carbon–Nb junctions / I.P. Nevirkovets, S.E. Shafranjuk, O. Chernyashevskyy, N. Masilamani, J.B. Ketterson // Физика низких температур. — 2014. — Т. 40, № 3. — С. 250-258. — Бібліогр.: 18 назв. — англ. |
| work_keys_str_mv |
AT nevirkovetsip currentvoltagecharacteristicsofnbcarbonnbjunctions AT shafranjukse currentvoltagecharacteristicsofnbcarbonnbjunctions AT chernyashevskyyo currentvoltagecharacteristicsofnbcarbonnbjunctions AT masilamanin currentvoltagecharacteristicsofnbcarbonnbjunctions AT kettersonjb currentvoltagecharacteristicsofnbcarbonnbjunctions |
| first_indexed |
2025-11-24T04:21:00Z |
| last_indexed |
2025-11-24T04:21:00Z |
| _version_ |
1850842071912415232 |