Superconducting energy gaps in Bi2Sr2CuO6+y and Bi2Sr2-xNdxCuO6+y

Toshikazu Ekino, Tohru Den, Jun Akimitsu

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Superconducting energy gaps in Bi2Sr2-xNdxCuO6+y (0≤x≤0.7) with Tc=6.5-20 K have been studied by the electron tunneling technique. The smallest gap value was found at ±2 meV for x=0 with Tc=6.5 K. The obtained gap values almost scale with x and thus Tc throughout the superconducting phase. The ratio 2Δpeak/kBTc=7.1 (2Δ/kBTc=4-5 with Δ from the BCS analysis) for the sample with Tc=6.5 K is still larger than the BCS ratio 3.5 of non-copper oxides (BaPb0.75Bi0.25O3 and Li1+xTi2-xO4) with Tc=11-12 K, indicating a substantial pairing nature difference between them.

Original languageEnglish
Pages (from-to)387-395
Number of pages9
JournalPhysica C: Superconductivity and its Applications
Volume218
Issue number3-4
DOIs
Publication statusPublished - Dec 15 1993
Externally publishedYes

Fingerprint

Electron tunneling
Oxides
Energy gap
electron tunneling
oxides

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Superconducting energy gaps in Bi2Sr2CuO6+y and Bi2Sr2-xNdxCuO6+y . / Ekino, Toshikazu; Den, Tohru; Akimitsu, Jun.

In: Physica C: Superconductivity and its Applications, Vol. 218, No. 3-4, 15.12.1993, p. 387-395.

Research output: Contribution to journalArticle

@article{54438635f40b48ffbd9bdfd65335928e,
title = "Superconducting energy gaps in Bi2Sr2CuO6+y and Bi2Sr2-xNdxCuO6+y",
abstract = "Superconducting energy gaps in Bi2Sr2-xNdxCuO6+y (0≤x≤0.7) with Tc=6.5-20 K have been studied by the electron tunneling technique. The smallest gap value was found at ±2 meV for x=0 with Tc=6.5 K. The obtained gap values almost scale with x and thus Tc throughout the superconducting phase. The ratio 2Δpeak/kBTc=7.1 (2Δ/kBTc=4-5 with Δ from the BCS analysis) for the sample with Tc=6.5 K is still larger than the BCS ratio 3.5 of non-copper oxides (BaPb0.75Bi0.25O3 and Li1+xTi2-xO4) with Tc=11-12 K, indicating a substantial pairing nature difference between them.",
author = "Toshikazu Ekino and Tohru Den and Jun Akimitsu",
year = "1993",
month = "12",
day = "15",
doi = "10.1016/0921-4534(93)90041-N",
language = "English",
volume = "218",
pages = "387--395",
journal = "Physica C: Superconductivity and its Applications",
issn = "0921-4534",
publisher = "Elsevier",
number = "3-4",

}

TY - JOUR

T1 - Superconducting energy gaps in Bi2Sr2CuO6+y and Bi2Sr2-xNdxCuO6+y

AU - Ekino, Toshikazu

AU - Den, Tohru

AU - Akimitsu, Jun

PY - 1993/12/15

Y1 - 1993/12/15

N2 - Superconducting energy gaps in Bi2Sr2-xNdxCuO6+y (0≤x≤0.7) with Tc=6.5-20 K have been studied by the electron tunneling technique. The smallest gap value was found at ±2 meV for x=0 with Tc=6.5 K. The obtained gap values almost scale with x and thus Tc throughout the superconducting phase. The ratio 2Δpeak/kBTc=7.1 (2Δ/kBTc=4-5 with Δ from the BCS analysis) for the sample with Tc=6.5 K is still larger than the BCS ratio 3.5 of non-copper oxides (BaPb0.75Bi0.25O3 and Li1+xTi2-xO4) with Tc=11-12 K, indicating a substantial pairing nature difference between them.

AB - Superconducting energy gaps in Bi2Sr2-xNdxCuO6+y (0≤x≤0.7) with Tc=6.5-20 K have been studied by the electron tunneling technique. The smallest gap value was found at ±2 meV for x=0 with Tc=6.5 K. The obtained gap values almost scale with x and thus Tc throughout the superconducting phase. The ratio 2Δpeak/kBTc=7.1 (2Δ/kBTc=4-5 with Δ from the BCS analysis) for the sample with Tc=6.5 K is still larger than the BCS ratio 3.5 of non-copper oxides (BaPb0.75Bi0.25O3 and Li1+xTi2-xO4) with Tc=11-12 K, indicating a substantial pairing nature difference between them.

UR - http://www.scopus.com/inward/record.url?scp=0027839844&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0027839844&partnerID=8YFLogxK

U2 - 10.1016/0921-4534(93)90041-N

DO - 10.1016/0921-4534(93)90041-N

M3 - Article

AN - SCOPUS:0027839844

VL - 218

SP - 387

EP - 395

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

SN - 0921-4534

IS - 3-4

ER -