Optimal growth conditions for GdBa2Cu3O7 thin-film coated conductors characterized by polarized Raman scattering spectroscopy

G. Kim; A. R. Jeong; W. Jo; D. Y. Park; H. Cheong; G. M. Shin; S. I. Yoo

doi:10.1016/j.physc.2010.05.025

Optimal growth conditions for GdBa₂Cu₃O₇ thin-film coated conductors characterized by polarized Raman scattering spectroscopy

G. Kim, A. R. Jeong, W. Jo, D. Y. Park, H. Cheong, G. M. Shin, S. I. Yoo

Department of Physics

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

5 Scopus citations

Abstract

High temperature superconducting GdBa₂Cu₃O ₇ (GdBCO) thin films were grown by pulsed laser ablation. Textured MgO on metal substrates was used as a template for second generation wire applications. Growth conditions of GdBCO thin films were investigated for substrate temperature (T_s) and oxygen partial pressure (PO ₂) during deposition. Superconducting critical currents of the films were obtained in the films grown at 790-810 °C of T_s and at 100-700 mTorr of PO₂. Scanning electron micrographs of the films revealed uniform and well-connected grains with some outgrown structures. X-ray θ-2θ scans of the films grown at 810 °C and 300-500 mTorr exhibited c-axis oriented texture. In-plane alignment and c-axis mosaic spread of the films were determined from X-ray Φ scans and rocking curves, respectively. Polarized Raman scattering spectroscopy was used to characterize optical phonon modes, oxygen content, cation disorder, and some possible second phases of the films. The Raman spectra of the films with large critical current density showed modes at 326-329 cm^-1, 444-447 cm^-1, 500-503 cm^-1 related to vibration of oxygen atoms. Origin of small peaks near 600 cm^-1 will be discussed as well. The information obtained from Raman scattering measurements will be useful for quality control of the conductors as well as optimization of the process conditions.

Original language	English
Pages (from-to)	1021-1024
Number of pages	4
Journal	Physica C: Superconductivity and its Applications
Volume	470
Issue number	20
DOIs	https://doi.org/10.1016/j.physc.2010.05.025
State	Published - 1 Nov 2010

Bibliographical note

Funding Information:
This research was supported by a grant from Center for Applied Superconductivity Technology of the 21st Century Frontier R&D Program funded by the Ministry of Education, Science and Technology, Republic of Korea . The work at Sogang University was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) grant funded by the MEST ( Quantum Photonic Science Research Center ).

Keywords

Crystalline orientation
GdBCO coated conductors
Polarized Raman scattering spectroscopy

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10.1016/j.physc.2010.05.025

Cite this

@article{d7b701c9d83b43d1b57fc2b9a9432d50,

title = "Optimal growth conditions for GdBa2Cu3O7 thin-film coated conductors characterized by polarized Raman scattering spectroscopy",

abstract = "High temperature superconducting GdBa2Cu3O 7 (GdBCO) thin films were grown by pulsed laser ablation. Textured MgO on metal substrates was used as a template for second generation wire applications. Growth conditions of GdBCO thin films were investigated for substrate temperature (Ts) and oxygen partial pressure (PO 2) during deposition. Superconducting critical currents of the films were obtained in the films grown at 790-810 °C of Ts and at 100-700 mTorr of PO2. Scanning electron micrographs of the films revealed uniform and well-connected grains with some outgrown structures. X-ray θ-2θ scans of the films grown at 810 °C and 300-500 mTorr exhibited c-axis oriented texture. In-plane alignment and c-axis mosaic spread of the films were determined from X-ray Φ scans and rocking curves, respectively. Polarized Raman scattering spectroscopy was used to characterize optical phonon modes, oxygen content, cation disorder, and some possible second phases of the films. The Raman spectra of the films with large critical current density showed modes at 326-329 cm-1, 444-447 cm-1, 500-503 cm-1 related to vibration of oxygen atoms. Origin of small peaks near 600 cm-1 will be discussed as well. The information obtained from Raman scattering measurements will be useful for quality control of the conductors as well as optimization of the process conditions.",

keywords = "Crystalline orientation, GdBCO coated conductors, Polarized Raman scattering spectroscopy",

author = "G. Kim and Jeong, {A. R.} and W. Jo and Park, {D. Y.} and H. Cheong and Shin, {G. M.} and Yoo, {S. I.}",

note = "Funding Information: This research was supported by a grant from Center for Applied Superconductivity Technology of the 21st Century Frontier R&D Program funded by the Ministry of Education, Science and Technology, Republic of Korea . The work at Sogang University was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) grant funded by the MEST ( Quantum Photonic Science Research Center ).",

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doi = "10.1016/j.physc.2010.05.025",

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T1 - Optimal growth conditions for GdBa2Cu3O7 thin-film coated conductors characterized by polarized Raman scattering spectroscopy

AU - Kim, G.

AU - Jeong, A. R.

AU - Jo, W.

AU - Park, D. Y.

AU - Cheong, H.

AU - Shin, G. M.

AU - Yoo, S. I.

N1 - Funding Information: This research was supported by a grant from Center for Applied Superconductivity Technology of the 21st Century Frontier R&D Program funded by the Ministry of Education, Science and Technology, Republic of Korea . The work at Sogang University was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) grant funded by the MEST ( Quantum Photonic Science Research Center ).

PY - 2010/11/1

Y1 - 2010/11/1

N2 - High temperature superconducting GdBa2Cu3O 7 (GdBCO) thin films were grown by pulsed laser ablation. Textured MgO on metal substrates was used as a template for second generation wire applications. Growth conditions of GdBCO thin films were investigated for substrate temperature (Ts) and oxygen partial pressure (PO 2) during deposition. Superconducting critical currents of the films were obtained in the films grown at 790-810 °C of Ts and at 100-700 mTorr of PO2. Scanning electron micrographs of the films revealed uniform and well-connected grains with some outgrown structures. X-ray θ-2θ scans of the films grown at 810 °C and 300-500 mTorr exhibited c-axis oriented texture. In-plane alignment and c-axis mosaic spread of the films were determined from X-ray Φ scans and rocking curves, respectively. Polarized Raman scattering spectroscopy was used to characterize optical phonon modes, oxygen content, cation disorder, and some possible second phases of the films. The Raman spectra of the films with large critical current density showed modes at 326-329 cm-1, 444-447 cm-1, 500-503 cm-1 related to vibration of oxygen atoms. Origin of small peaks near 600 cm-1 will be discussed as well. The information obtained from Raman scattering measurements will be useful for quality control of the conductors as well as optimization of the process conditions.

AB - High temperature superconducting GdBa2Cu3O 7 (GdBCO) thin films were grown by pulsed laser ablation. Textured MgO on metal substrates was used as a template for second generation wire applications. Growth conditions of GdBCO thin films were investigated for substrate temperature (Ts) and oxygen partial pressure (PO 2) during deposition. Superconducting critical currents of the films were obtained in the films grown at 790-810 °C of Ts and at 100-700 mTorr of PO2. Scanning electron micrographs of the films revealed uniform and well-connected grains with some outgrown structures. X-ray θ-2θ scans of the films grown at 810 °C and 300-500 mTorr exhibited c-axis oriented texture. In-plane alignment and c-axis mosaic spread of the films were determined from X-ray Φ scans and rocking curves, respectively. Polarized Raman scattering spectroscopy was used to characterize optical phonon modes, oxygen content, cation disorder, and some possible second phases of the films. The Raman spectra of the films with large critical current density showed modes at 326-329 cm-1, 444-447 cm-1, 500-503 cm-1 related to vibration of oxygen atoms. Origin of small peaks near 600 cm-1 will be discussed as well. The information obtained from Raman scattering measurements will be useful for quality control of the conductors as well as optimization of the process conditions.

KW - Crystalline orientation

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