Impurity effects of hydrogen and deuterium in vanadium nanoconstrictions

M. S. Islam, Y. Ueno, H. Takata, Y. Inagaki, K. Hashizume, T. Kawae

Research output: Contribution to journalConference article

Abstract

To study non-magnetic and magnetic impurity effects at the superconductor-normal metal interfaces, we have measured the differential conductance dI/dV for Josephson contacts made by vanadium (V) nanoconstrictions with a different amount of hydrogen (H) and deuterium (D) impurities, which are prepared by a mechanically controllable break junction (MCBJ) technique at low temperature. Below the superconducting transition temperature T C, we have found distinct peaks within and outside the gap, known as the sub-gap structure and an over-The-gap structure respectively, due to 5% concentration of atomic H and D on V nanocontact. Moreover, the temperature dependence of dI/dV spectra represents that both structures are survived until the critical temperature T C, which is consistent with the prediction of BCS energy gap. On the other hand, a very high concentrating phase (30atom%) behaves as a normal metal.

Original languageEnglish
Article number012046
JournalJournal of Physics: Conference Series
Volume969
Issue number1
DOIs
Publication statusPublished - Apr 19 2018
Event28th International Conference on Low Temperature Physics, LT 2018 - Gothenburg, Sweden
Duration: Aug 9 2017Aug 16 2017

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vanadium
deuterium
impurities
hydrogen
concentrating
metals
critical temperature
transition temperature
temperature dependence
predictions

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Impurity effects of hydrogen and deuterium in vanadium nanoconstrictions. / Islam, M. S.; Ueno, Y.; Takata, H.; Inagaki, Y.; Hashizume, K.; Kawae, T.

In: Journal of Physics: Conference Series, Vol. 969, No. 1, 012046, 19.04.2018.

Research output: Contribution to journalConference article

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AU - Kawae, T.

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AB - To study non-magnetic and magnetic impurity effects at the superconductor-normal metal interfaces, we have measured the differential conductance dI/dV for Josephson contacts made by vanadium (V) nanoconstrictions with a different amount of hydrogen (H) and deuterium (D) impurities, which are prepared by a mechanically controllable break junction (MCBJ) technique at low temperature. Below the superconducting transition temperature T C, we have found distinct peaks within and outside the gap, known as the sub-gap structure and an over-The-gap structure respectively, due to 5% concentration of atomic H and D on V nanocontact. Moreover, the temperature dependence of dI/dV spectra represents that both structures are survived until the critical temperature T C, which is consistent with the prediction of BCS energy gap. On the other hand, a very high concentrating phase (30atom%) behaves as a normal metal.

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