Superconducting gap in polycrystalline MgB2 studied by electron tunneling

T. Takasaki; T. Ekino; T. Muranaka; H. Fujii; J. Akimitsu

doi:10.1016/S0921-4534(02)01418-1

Superconducting gap in polycrystalline MgB₂ studied by electron tunneling

T. Takasaki, T. Ekino, T. Muranaka, H. Fujii, J. Akimitsu

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

9 Citations (Scopus)

Abstract

Electron-tunneling measurements on the new superconductor MgB₂ with T_c = 39 K have been carried out using a break-junction technique. The measurements reveal the largest gap value of 2Δ = 17-19 meV at 4.2 K. This value leads to the ratio 2Δ/k_BT_c = 5-5.6, indicating the strong-coupling superconductivity. We have also observed the reproducible gap values of 2Δ ≅ 4-4.5 meV and 7-9 meV. The smallest gap exists even beyond 30 K. We will discuss the implication of the data.

Original language	English
Pages (from-to)	229-233
Number of pages	5
Journal	Physica C: Superconductivity and its applications
Volume	378-381
Issue number	PART 1
DOIs	https://doi.org/10.1016/S0921-4534(02)01418-1
Publication status	Published - Oct 1 2002
Externally published	Yes

Keywords

Break junction
MgB
Tunneling spectroscopy

ASJC Scopus subject areas

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

Access to Document

10.1016/S0921-4534(02)01418-1

Cite this

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title = "Superconducting gap in polycrystalline MgB2 studied by electron tunneling",

abstract = "Electron-tunneling measurements on the new superconductor MgB2 with Tc = 39 K have been carried out using a break-junction technique. The measurements reveal the largest gap value of 2Δ = 17-19 meV at 4.2 K. This value leads to the ratio 2Δ/kBTc = 5-5.6, indicating the strong-coupling superconductivity. We have also observed the reproducible gap values of 2Δ ≅ 4-4.5 meV and 7-9 meV. The smallest gap exists even beyond 30 K. We will discuss the implication of the data.",

keywords = "Break junction, MgB, Tunneling spectroscopy",

author = "T. Takasaki and T. Ekino and T. Muranaka and H. Fujii and J. Akimitsu",

note = "Funding Information: This work is supported in part by a Grant-in-Aid for COE research (no. 13CE2002) of the Ministry of Education, Culture, Sports Science and Technology of Japan.",

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T1 - Superconducting gap in polycrystalline MgB2 studied by electron tunneling

AU - Takasaki, T.

AU - Ekino, T.

AU - Muranaka, T.

AU - Fujii, H.

AU - Akimitsu, J.

N1 - Funding Information: This work is supported in part by a Grant-in-Aid for COE research (no. 13CE2002) of the Ministry of Education, Culture, Sports Science and Technology of Japan.

PY - 2002/10/1

Y1 - 2002/10/1

N2 - Electron-tunneling measurements on the new superconductor MgB2 with Tc = 39 K have been carried out using a break-junction technique. The measurements reveal the largest gap value of 2Δ = 17-19 meV at 4.2 K. This value leads to the ratio 2Δ/kBTc = 5-5.6, indicating the strong-coupling superconductivity. We have also observed the reproducible gap values of 2Δ ≅ 4-4.5 meV and 7-9 meV. The smallest gap exists even beyond 30 K. We will discuss the implication of the data.

AB - Electron-tunneling measurements on the new superconductor MgB2 with Tc = 39 K have been carried out using a break-junction technique. The measurements reveal the largest gap value of 2Δ = 17-19 meV at 4.2 K. This value leads to the ratio 2Δ/kBTc = 5-5.6, indicating the strong-coupling superconductivity. We have also observed the reproducible gap values of 2Δ ≅ 4-4.5 meV and 7-9 meV. The smallest gap exists even beyond 30 K. We will discuss the implication of the data.

KW - Break junction

KW - MgB

KW - Tunneling spectroscopy

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