Raman spectroscopy on nonstoichiometric Gd123 thin films

T. Kakeshita; K. Hirose; S. Lee

doi:10.1016/j.physc.2007.05.011

Raman spectroscopy on nonstoichiometric Gd123 thin films

T. Kakeshita, K. Hirose, S. Lee

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

4 Citations (Scopus)

Abstract

We performed the Raman measurements to investigate the effect of cation nonstoichiometry on Gd123 thin films. The Gd123 thin films are grown by a conventional pulsed laser deposition (PLD) method with cation off-stoichiometric target samples. The films show different superconducting (SC) properties (T_c, J_c) from one another. The Ba-poor composition shows the best SC properties, while the Ba-rich composition shows the worst properties. The Raman spectra also depend on the compositions. All the spectra exhibit the five phonon peaks peculiar to 123-structure, however, some show also other peaks which result from oxygen deficiency in the chain structure, or also other origins. We discuss that the SC properties are strongly affected by the disorders of Ba and chain sites due to the cation nonstoichiometry through the Raman spectra.

Original language	English
Pages (from-to)	96-99
Number of pages	4
Journal	Physica C: Superconductivity and its applications
Volume	463-465
Issue number	SUPPL.
DOIs	https://doi.org/10.1016/j.physc.2007.05.011
Publication status	Published - 2007 Oct 1

Keywords

Gd123
Nonstoichiometry
Phonon
Raman

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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abstract = "We performed the Raman measurements to investigate the effect of cation nonstoichiometry on Gd123 thin films. The Gd123 thin films are grown by a conventional pulsed laser deposition (PLD) method with cation off-stoichiometric target samples. The films show different superconducting (SC) properties (Tc, Jc) from one another. The Ba-poor composition shows the best SC properties, while the Ba-rich composition shows the worst properties. The Raman spectra also depend on the compositions. All the spectra exhibit the five phonon peaks peculiar to 123-structure, however, some show also other peaks which result from oxygen deficiency in the chain structure, or also other origins. We discuss that the SC properties are strongly affected by the disorders of Ba and chain sites due to the cation nonstoichiometry through the Raman spectra.",

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AU - Kakeshita, T.

AU - Hirose, K.

AU - Lee, S.

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N2 - We performed the Raman measurements to investigate the effect of cation nonstoichiometry on Gd123 thin films. The Gd123 thin films are grown by a conventional pulsed laser deposition (PLD) method with cation off-stoichiometric target samples. The films show different superconducting (SC) properties (Tc, Jc) from one another. The Ba-poor composition shows the best SC properties, while the Ba-rich composition shows the worst properties. The Raman spectra also depend on the compositions. All the spectra exhibit the five phonon peaks peculiar to 123-structure, however, some show also other peaks which result from oxygen deficiency in the chain structure, or also other origins. We discuss that the SC properties are strongly affected by the disorders of Ba and chain sites due to the cation nonstoichiometry through the Raman spectra.

AB - We performed the Raman measurements to investigate the effect of cation nonstoichiometry on Gd123 thin films. The Gd123 thin films are grown by a conventional pulsed laser deposition (PLD) method with cation off-stoichiometric target samples. The films show different superconducting (SC) properties (Tc, Jc) from one another. The Ba-poor composition shows the best SC properties, while the Ba-rich composition shows the worst properties. The Raman spectra also depend on the compositions. All the spectra exhibit the five phonon peaks peculiar to 123-structure, however, some show also other peaks which result from oxygen deficiency in the chain structure, or also other origins. We discuss that the SC properties are strongly affected by the disorders of Ba and chain sites due to the cation nonstoichiometry through the Raman spectra.

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KW - Phonon

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