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 |
| Main Authors: | , , , , |
| Format: | Article |
| Language: | English |
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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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Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1862532339243941888 |
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| 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. |
| 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. |
| collection | DSpace DC |
| container_title | Физика низких температур |
| 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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| first_indexed | 2025-11-24T04:21:00Z |
| format | Article |
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| id | nasplib_isofts_kiev_ua-123456789-119426 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 0132-6414 |
| language | English |
| last_indexed | 2025-11-24T04:21:00Z |
| publishDate | 2014 |
| publisher | Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| record_format | dspace |
| spelling | 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 |
| 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 | 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_short | Current–voltage characteristics of Nb–carbon–Nb junctions |
| title_sort | current–voltage characteristics of nb–carbon–nb junctions |
| topic | Свеpхпpоводимость, в том числе высокотемпеpатуpная |
| topic_facet | Свеpхпpоводимость, в том числе высокотемпеpатуpная |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/119426 |
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