Growth of (Cu,C)Ba2CuOy thin films by molecular-beam epitaxy

H. Shibata; S. Karimoto; T. Makimoto

doi:10.1016/j.physc.2006.12.022

Growth of (Cu,C)Ba₂CuO_y thin films by molecular-beam epitaxy

H. Shibata^*, S. Karimoto, T. Makimoto

^*Corresponding author for this work

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

2 Citations (Scopus)

Abstract

We report the growth of (Cu,C)Ba₂CuO_y thin films by molecular-beam epitaxy (MBE). The c-axis oriented film is obtained with a = 3.959 Å and c = 8.140 Å. The T_c values of the film on an NdGaO₃ substrate are T_c(on) ∼ 35 K and T_c(zero) ∼ 18 K. The T_c(on) is increased to 70 K for a 12 nm-thick film deposited on an infinite-layer CaCuO₂ buffer layer. This suggests that the layer-by-layer growth method using (Cu,C)Ba₂CuO_y and [CaCuO₂]_n-1 is a promising way to obtain higher member (Cu,C)Ba₂Ca_n-1Cu_nO_y (n ≥ 2) thin films with a higher T_c. We also find that the Ba-Cu-O phase with c ∼ 4.0 Å, which is known as the 'infinite-layer BaCuO₂' phase, can be obtained only in a slightly CO₂ atmosphere. This means that the phase contains carbon in its structure.

Original language	English
Pages (from-to)	939-941
Number of pages	3
Journal	Physica C: Superconductivity and its applications
Volume	463-465
Issue number	SUPPL.
DOIs	https://doi.org/10.1016/j.physc.2006.12.022
Publication status	Published - 2007 Oct 1
Externally published	Yes

Keywords

MBE
Oxycarbonate
Superconductor
Thin films

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/j.physc.2006.12.022

Cite this

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title = "Growth of (Cu,C)Ba2CuOy thin films by molecular-beam epitaxy",

abstract = "We report the growth of (Cu,C)Ba2CuOy thin films by molecular-beam epitaxy (MBE). The c-axis oriented film is obtained with a = 3.959 {\AA} and c = 8.140 {\AA}. The Tc values of the film on an NdGaO3 substrate are Tc(on) ∼ 35 K and Tc(zero) ∼ 18 K. The Tc(on) is increased to 70 K for a 12 nm-thick film deposited on an infinite-layer CaCuO2 buffer layer. This suggests that the layer-by-layer growth method using (Cu,C)Ba2CuOy and [CaCuO2]n-1 is a promising way to obtain higher member (Cu,C)Ba2Can-1CunOy (n ≥ 2) thin films with a higher Tc. We also find that the Ba-Cu-O phase with c ∼ 4.0 {\AA}, which is known as the 'infinite-layer BaCuO2' phase, can be obtained only in a slightly CO2 atmosphere. This means that the phase contains carbon in its structure.",

keywords = "MBE, Oxycarbonate, Superconductor, Thin films",

author = "H. Shibata and S. Karimoto and T. Makimoto",

year = "2007",

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AU - Shibata, H.

AU - Karimoto, S.

AU - Makimoto, T.

PY - 2007/10/1

Y1 - 2007/10/1

N2 - We report the growth of (Cu,C)Ba2CuOy thin films by molecular-beam epitaxy (MBE). The c-axis oriented film is obtained with a = 3.959 Å and c = 8.140 Å. The Tc values of the film on an NdGaO3 substrate are Tc(on) ∼ 35 K and Tc(zero) ∼ 18 K. The Tc(on) is increased to 70 K for a 12 nm-thick film deposited on an infinite-layer CaCuO2 buffer layer. This suggests that the layer-by-layer growth method using (Cu,C)Ba2CuOy and [CaCuO2]n-1 is a promising way to obtain higher member (Cu,C)Ba2Can-1CunOy (n ≥ 2) thin films with a higher Tc. We also find that the Ba-Cu-O phase with c ∼ 4.0 Å, which is known as the 'infinite-layer BaCuO2' phase, can be obtained only in a slightly CO2 atmosphere. This means that the phase contains carbon in its structure.

AB - We report the growth of (Cu,C)Ba2CuOy thin films by molecular-beam epitaxy (MBE). The c-axis oriented film is obtained with a = 3.959 Å and c = 8.140 Å. The Tc values of the film on an NdGaO3 substrate are Tc(on) ∼ 35 K and Tc(zero) ∼ 18 K. The Tc(on) is increased to 70 K for a 12 nm-thick film deposited on an infinite-layer CaCuO2 buffer layer. This suggests that the layer-by-layer growth method using (Cu,C)Ba2CuOy and [CaCuO2]n-1 is a promising way to obtain higher member (Cu,C)Ba2Can-1CunOy (n ≥ 2) thin films with a higher Tc. We also find that the Ba-Cu-O phase with c ∼ 4.0 Å, which is known as the 'infinite-layer BaCuO2' phase, can be obtained only in a slightly CO2 atmosphere. This means that the phase contains carbon in its structure.

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KW - Superconductor

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