Josephson effect and Andreev reflection in Ba₁₋xNaxFe₂As₂ (x = 0.25 and 0.35) point contacts
I(V) characteristics and their first derivatives of ScS and ScN-type (S is superconductor, c is constriction, N is normal metal) point contacts (PCs) based on Ba₁₋xNaxFe₂As₂ (x = 0.25 and 0.35) were studied. ScS-type PCs with S = Nb,Ta, and Pb show Josephson-like resistively shunted I(V) curves wi...
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| Опубліковано в: : | Физика низких температур |
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| Дата: | 2014 |
| 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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| Онлайн доступ: | https://nasplib.isofts.kiev.ua/handle/123456789/119675 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | Josephson effect and Andreev reflection in Ba₁₋xNaxFe₂As₂ (x = 0.25 and 0.35) point contacts / V.V. Fisun, O.P. Balkashin, O.E. Kvitnitskaya, I.A. Korovkin, N.V. Gamayunova, S. Aswartham, S. Wurmehl, Yu.G. Naidyuk // Физика низких температур. — 2014. — Т. 40, № 10. — С. 1175-1181. — Бібліогр.: 24 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| id |
nasplib_isofts_kiev_ua-123456789-119675 |
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Fisun, V.V. Balkashin, O.P. Kvitnitskaya, O.E. Korovkin, I.A. Gamayunova, N.V. Aswartham, S. Wurmehl, S. Naidyuk, Yu.G 2017-06-08T04:41:19Z 2017-06-08T04:41:19Z 2014 Josephson effect and Andreev reflection in Ba₁₋xNaxFe₂As₂ (x = 0.25 and 0.35) point contacts / V.V. Fisun, O.P. Balkashin, O.E. Kvitnitskaya, I.A. Korovkin, N.V. Gamayunova, S. Aswartham, S. Wurmehl, Yu.G. Naidyuk // Физика низких температур. — 2014. — Т. 40, № 10. — С. 1175-1181. — Бібліогр.: 24 назв. — англ. 0132-6414 PACS 74.50.+r, 74.70.Dd, 74.45.+c https://nasplib.isofts.kiev.ua/handle/123456789/119675 I(V) characteristics and their first derivatives of ScS and ScN-type (S is superconductor, c is constriction, N is normal metal) point contacts (PCs) based on Ba₁₋xNaxFe₂As₂ (x = 0.25 and 0.35) were studied. ScS-type PCs with S = Nb,Ta, and Pb show Josephson-like resistively shunted I(V) curves with microwave induced Shapiro steps which satisfy relation 2eV = ω. The IcRN product (Ic is critical current, RN is normal state PC resistance) in these PCs is found to be up to 1.2 mV. All this data with the observed dependence of the Ic on the microwave power of ScS PCs with Pb counterelectrode indicates the presence of the singlet s-wave type pairing in Ba₁₋xNaxFe₂As₂. From the dV/dI(V) curves of ScN-type PCs demonstrating Andreev-reflection like features, the superconducting gap ∆ ratio 2∆/kBTc = 3.6 ± 1 for the compound with x = 0.35 was evaluated. Analysis of these dV/dI(V) at high biases V, that is well above ∆, testifies transition to the thermal regime in PCs with a voltage increase. Funding by the National Academy of Sciences of Ukraine under project Ф3-19 is gratefully acknowledged. Yu.G.N. and O.E.K. would like to trank the IFW Dresden for hospitality and the Alexander von Humboldt Foundation for the financial support in the frame of a research group linkage program. S.W. acknowledges the Deutsche Forschungsgemeinshaft DFG (priority program SPP 1485 and Emmy Nother program: projects Bu887/15-1 and WU595/3-2) for support. We thank B. Büchner for valuable discussions. en Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України Физика низких температур III Международный семинар по микроконтактной спектроскопии Josephson effect and Andreev reflection in Ba₁₋xNaxFe₂As₂ (x = 0.25 and 0.35) point contacts Article published earlier |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| title |
Josephson effect and Andreev reflection in Ba₁₋xNaxFe₂As₂ (x = 0.25 and 0.35) point contacts |
| spellingShingle |
Josephson effect and Andreev reflection in Ba₁₋xNaxFe₂As₂ (x = 0.25 and 0.35) point contacts Fisun, V.V. Balkashin, O.P. Kvitnitskaya, O.E. Korovkin, I.A. Gamayunova, N.V. Aswartham, S. Wurmehl, S. Naidyuk, Yu.G III Международный семинар по микроконтактной спектроскопии |
| title_short |
Josephson effect and Andreev reflection in Ba₁₋xNaxFe₂As₂ (x = 0.25 and 0.35) point contacts |
| title_full |
Josephson effect and Andreev reflection in Ba₁₋xNaxFe₂As₂ (x = 0.25 and 0.35) point contacts |
| title_fullStr |
Josephson effect and Andreev reflection in Ba₁₋xNaxFe₂As₂ (x = 0.25 and 0.35) point contacts |
| title_full_unstemmed |
Josephson effect and Andreev reflection in Ba₁₋xNaxFe₂As₂ (x = 0.25 and 0.35) point contacts |
| title_sort |
josephson effect and andreev reflection in ba₁₋xnaxfe₂as₂ (x = 0.25 and 0.35) point contacts |
| author |
Fisun, V.V. Balkashin, O.P. Kvitnitskaya, O.E. Korovkin, I.A. Gamayunova, N.V. Aswartham, S. Wurmehl, S. Naidyuk, Yu.G |
| author_facet |
Fisun, V.V. Balkashin, O.P. Kvitnitskaya, O.E. Korovkin, I.A. Gamayunova, N.V. Aswartham, S. Wurmehl, S. Naidyuk, Yu.G |
| topic |
III Международный семинар по микроконтактной спектроскопии |
| topic_facet |
III Международный семинар по микроконтактной спектроскопии |
| publishDate |
2014 |
| language |
English |
| container_title |
Физика низких температур |
| publisher |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| format |
Article |
| description |
I(V) characteristics and their first derivatives of ScS and ScN-type (S is superconductor, c is constriction, N is
normal metal) point contacts (PCs) based on Ba₁₋xNaxFe₂As₂ (x = 0.25 and 0.35) were studied. ScS-type PCs with
S = Nb,Ta, and Pb show Josephson-like resistively shunted I(V) curves with microwave induced Shapiro steps
which satisfy relation 2eV = ω. The IcRN product (Ic is critical current, RN is normal state PC resistance) in these
PCs is found to be up to 1.2 mV. All this data with the observed dependence of the Ic on the microwave power of
ScS PCs with Pb counterelectrode indicates the presence of the singlet s-wave type pairing in Ba₁₋xNaxFe₂As₂.
From the dV/dI(V) curves of ScN-type PCs demonstrating Andreev-reflection like features, the superconducting gap
∆ ratio 2∆/kBTc = 3.6 ± 1 for the compound with x = 0.35 was evaluated. Analysis of these dV/dI(V) at high biases
V, that is well above ∆, testifies transition to the thermal regime in PCs with a voltage increase.
|
| issn |
0132-6414 |
| url |
https://nasplib.isofts.kiev.ua/handle/123456789/119675 |
| citation_txt |
Josephson effect and Andreev reflection in Ba₁₋xNaxFe₂As₂ (x = 0.25 and 0.35) point contacts / V.V. Fisun, O.P. Balkashin, O.E. Kvitnitskaya, I.A. Korovkin, N.V. Gamayunova, S. Aswartham, S. Wurmehl, Yu.G. Naidyuk // Физика низких температур. — 2014. — Т. 40, № 10. — С. 1175-1181. — Бібліогр.: 24 назв. — англ. |
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