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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| Дата: | 2014 |
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| Автори: | , , , , |
| Формат: | Стаття |
| Мова: | English |
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Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2014
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| Назва видання: | Физика низких температур |
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| Онлайн доступ: | http://dspace.nbuv.gov.ua/handle/123456789/119426 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | 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| id |
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irk-123456789-1194262017-06-07T03:04:35Z 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 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 2014 Article 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 http://dspace.nbuv.gov.ua/handle/123456789/119426 en Физика низких температур Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| language |
English |
| topic |
Свеpхпpоводимость, в том числе высокотемпеpатуpная Свеpхпpоводимость, в том числе высокотемпеpатуpная |
| spellingShingle |
Свеpхпpоводимость, в том числе высокотемпеpатуpная Свеpхпpоводимость, в том числе высокотемпеpатуpная Nevirkovets, I.P. Shafranjuk, S.E. Chernyashevskyy, O. Masilamani, N. Ketterson, J.B. Current–voltage characteristics of Nb–carbon–Nb junctions 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 |
| format |
Article |
| 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. |
| author_sort |
Nevirkovets, I.P. |
| title |
Current–voltage characteristics of Nb–carbon–Nb junctions |
| 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 |
| publisher |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| publishDate |
2014 |
| topic_facet |
Свеpхпpоводимость, в том числе высокотемпеpатуpная |
| url |
http://dspace.nbuv.gov.ua/handle/123456789/119426 |
| 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. |
| series |
Физика низких температур |
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2025-07-08T15:51:11Z |
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