Tunneling studies on Ba1-xKxBiO3 single crystals with Tc = 15-30 K

M. Kosugi; J. Akimitsu; T. Uchida; M. Furuya; Y. Nagata; T. Ekino

doi:10.1016/0921-4534(94)90522-3

Tunneling studies on Ba_1-xK_xBiO₃ single crystals with T_c = 15-30 K

M. Kosugi, J. Akimitsu, T. Uchida, M. Furuya, Y. Nagata, T. Ekino

Research output: Contribution to journal › Article › peer-review

14 Citations (Scopus)

Abstract

Tunneling measurements have been performed on high-quality Ba_1-xK_xBiO₃ single crystals with T_c's between 15 and 30 K. The junctions are Ba_1-xK_xBiO₃/natural barrier/Au sandwich type, which exhibit very low leakage currents at zero bias and sharp conductance peaks at the gap-edges. The average ratio of 2Δ/k_BT_c = 3.5±0.1 is obtained using more than 20 different junctions (different samples) with T_C's determined from tunnel junctions. Temperature dependence of the energy gap is consistent with the BCS prediction. Second derivative measurements of current-voltage characteristics have also been carried out. Observed strengths and peak positions of the superconducting phonon structures in d²I/dV² strongly support phonon-mediated superconductivity in Ba_1-xK_xBiO₃.

Original language	English
Pages (from-to)	389-395
Number of pages	7
Journal	Physica C: Superconductivity and its applications
Volume	229
Issue number	3-4
DOIs	https://doi.org/10.1016/0921-4534(94)90522-3
Publication status	Published - Aug 15 1994
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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10.1016/0921-4534(94)90522-3

Cite this

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title = "Tunneling studies on Ba1-xKxBiO3 single crystals with Tc = 15-30 K",

abstract = "Tunneling measurements have been performed on high-quality Ba1-xKxBiO3 single crystals with Tc's between 15 and 30 K. The junctions are Ba1-xKxBiO3/natural barrier/Au sandwich type, which exhibit very low leakage currents at zero bias and sharp conductance peaks at the gap-edges. The average ratio of 2Δ/kBTc = 3.5±0.1 is obtained using more than 20 different junctions (different samples) with TC's determined from tunnel junctions. Temperature dependence of the energy gap is consistent with the BCS prediction. Second derivative measurements of current-voltage characteristics have also been carried out. Observed strengths and peak positions of the superconducting phonon structures in d2I/dV2 strongly support phonon-mediated superconductivity in Ba1-xKxBiO3.",

author = "M. Kosugi and J. Akimitsu and T. Uchida and M. Furuya and Y. Nagata and T. Ekino",

year = "1994",

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T1 - Tunneling studies on Ba1-xKxBiO3 single crystals with Tc = 15-30 K

AU - Kosugi, M.

AU - Akimitsu, J.

AU - Uchida, T.

AU - Furuya, M.

AU - Nagata, Y.

AU - Ekino, T.

PY - 1994/8/15

Y1 - 1994/8/15

N2 - Tunneling measurements have been performed on high-quality Ba1-xKxBiO3 single crystals with Tc's between 15 and 30 K. The junctions are Ba1-xKxBiO3/natural barrier/Au sandwich type, which exhibit very low leakage currents at zero bias and sharp conductance peaks at the gap-edges. The average ratio of 2Δ/kBTc = 3.5±0.1 is obtained using more than 20 different junctions (different samples) with TC's determined from tunnel junctions. Temperature dependence of the energy gap is consistent with the BCS prediction. Second derivative measurements of current-voltage characteristics have also been carried out. Observed strengths and peak positions of the superconducting phonon structures in d2I/dV2 strongly support phonon-mediated superconductivity in Ba1-xKxBiO3.

AB - Tunneling measurements have been performed on high-quality Ba1-xKxBiO3 single crystals with Tc's between 15 and 30 K. The junctions are Ba1-xKxBiO3/natural barrier/Au sandwich type, which exhibit very low leakage currents at zero bias and sharp conductance peaks at the gap-edges. The average ratio of 2Δ/kBTc = 3.5±0.1 is obtained using more than 20 different junctions (different samples) with TC's determined from tunnel junctions. Temperature dependence of the energy gap is consistent with the BCS prediction. Second derivative measurements of current-voltage characteristics have also been carried out. Observed strengths and peak positions of the superconducting phonon structures in d2I/dV2 strongly support phonon-mediated superconductivity in Ba1-xKxBiO3.

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Tunneling studies on Ba_1-xK_xBiO₃ single crystals with T_c = 15-30 K

Abstract

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