Superconductivity In YBa2Cu3O7/PrBa2Cu3O7Superlattices

Qi Li; X. X. Xi; W. L. Mclean; T. Venkatesan; S. V. Vadlamannati; J. A. Martinez

doi:10.1109/20.133988

Superconductivity In YBa2Cu3O7/PrBa2Cu3O7Superlattices

Qi Li, X. X. Xi, W. L. Mclean, T. Venkatesan, S. V. Vadlamannati, J. A. Martinez

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

2 Scopus citations

Abstract

High quality YBa2Cu307/PrBa2Cu307 superlattices with desired thicknesses of each component were fabricated by laser deposition. Superconductivity was studied by varying both YBa2Cu3O7 and PrBa2Cu307 layer thicknesses. The results indicated that an isolated single unit cell YBa2Cu3O7 layer (nominal thickness of 12 AËš) is superconducting. The increase of Tcfrom the lower value of a single unit cell layer to 90 K in thick films and the enhancement of Tcfor a given thickness of YBa2Cu3O7 when the PrBa2Cu307 layers decreased to less than ~30 AËšcould be attributed to the interlayer coupling effect. Superconducting transitions of superlattices in applied magnetic fields were studied. The interlayer coupling effect on vortices can be seen by comparing the transition curves in high magnetic fields of thick film, ultrathin film and superlattice. For the samples with very thin YBa2Cu3O7 layers, similar results to vortex-antivortex pair phase transition was observed by measuring the temperature dependence of resistance, magnetoresistance, and I-V curves, indicating a strong two dimensional behavior in very thin YBa2Cu3O7 films.

Original language	English (US)
Pages (from-to)	2472-2475
Number of pages	4
Journal	IEEE Transactions on Magnetics
Volume	27
Issue number	2
DOIs	https://doi.org/10.1109/20.133988
State	Published - Mar 1991

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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title = "Superconductivity In YBa2Cu3O7/PrBa2Cu3O7Superlattices",

abstract = "High quality YBa2Cu307/PrBa2Cu307 superlattices with desired thicknesses of each component were fabricated by laser deposition. Superconductivity was studied by varying both YBa2Cu3O7 and PrBa2Cu307 layer thicknesses. The results indicated that an isolated single unit cell YBa2Cu3O7 layer (nominal thickness of 12 A{\"E}{\v s}) is superconducting. The increase of Tcfrom the lower value of a single unit cell layer to 90 K in thick films and the enhancement of Tcfor a given thickness of YBa2Cu3O7 when the PrBa2Cu307 layers decreased to less than ~30 A{\"E}{\v s}could be attributed to the interlayer coupling effect. Superconducting transitions of superlattices in applied magnetic fields were studied. The interlayer coupling effect on vortices can be seen by comparing the transition curves in high magnetic fields of thick film, ultrathin film and superlattice. For the samples with very thin YBa2Cu3O7 layers, similar results to vortex-antivortex pair phase transition was observed by measuring the temperature dependence of resistance, magnetoresistance, and I-V curves, indicating a strong two dimensional behavior in very thin YBa2Cu3O7 films.",

author = "Qi Li and Xi, {X. X.} and Mclean, {W. L.} and T. Venkatesan and Vadlamannati, {S. V.} and Martinez, {J. A.}",

year = "1991",

month = mar,

doi = "10.1109/20.133988",

language = "English (US)",

volume = "27",

pages = "2472--2475",

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T1 - Superconductivity In YBa2Cu3O7/PrBa2Cu3O7Superlattices

AU - Li, Qi

AU - Xi, X. X.

AU - Mclean, W. L.

AU - Venkatesan, T.

AU - Vadlamannati, S. V.

AU - Martinez, J. A.

PY - 1991/3

Y1 - 1991/3

N2 - High quality YBa2Cu307/PrBa2Cu307 superlattices with desired thicknesses of each component were fabricated by laser deposition. Superconductivity was studied by varying both YBa2Cu3O7 and PrBa2Cu307 layer thicknesses. The results indicated that an isolated single unit cell YBa2Cu3O7 layer (nominal thickness of 12 AËš) is superconducting. The increase of Tcfrom the lower value of a single unit cell layer to 90 K in thick films and the enhancement of Tcfor a given thickness of YBa2Cu3O7 when the PrBa2Cu307 layers decreased to less than ~30 AËšcould be attributed to the interlayer coupling effect. Superconducting transitions of superlattices in applied magnetic fields were studied. The interlayer coupling effect on vortices can be seen by comparing the transition curves in high magnetic fields of thick film, ultrathin film and superlattice. For the samples with very thin YBa2Cu3O7 layers, similar results to vortex-antivortex pair phase transition was observed by measuring the temperature dependence of resistance, magnetoresistance, and I-V curves, indicating a strong two dimensional behavior in very thin YBa2Cu3O7 films.

AB - High quality YBa2Cu307/PrBa2Cu307 superlattices with desired thicknesses of each component were fabricated by laser deposition. Superconductivity was studied by varying both YBa2Cu3O7 and PrBa2Cu307 layer thicknesses. The results indicated that an isolated single unit cell YBa2Cu3O7 layer (nominal thickness of 12 AËš) is superconducting. The increase of Tcfrom the lower value of a single unit cell layer to 90 K in thick films and the enhancement of Tcfor a given thickness of YBa2Cu3O7 when the PrBa2Cu307 layers decreased to less than ~30 AËšcould be attributed to the interlayer coupling effect. Superconducting transitions of superlattices in applied magnetic fields were studied. The interlayer coupling effect on vortices can be seen by comparing the transition curves in high magnetic fields of thick film, ultrathin film and superlattice. For the samples with very thin YBa2Cu3O7 layers, similar results to vortex-antivortex pair phase transition was observed by measuring the temperature dependence of resistance, magnetoresistance, and I-V curves, indicating a strong two dimensional behavior in very thin YBa2Cu3O7 films.

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Superconductivity In YBa2Cu3O7/PrBa2Cu3O7Superlattices

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