Effects of 3.1-MeV proton and 1-GeV Au-ion irradiation on the magnetic flux noise and critical current

T. Shaw, John Clarke, R. van Dover, Lynn Schneemeyer, A. White

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Abstract

We have used a dc superconducting quantum interference device to measure the spectral density of magnetic flux noise, (Formula presented), generated by vortex motion in crystals of (Formula presented) (YBCO) both before and after irradiation with 3.1-MeV protons and 1-GeV Au ions. In addition, we have studied the effects of irradiation on the critical current (Formula presented) of the same samples. Both types of irradiation reduced (Formula presented) at most temperatures and magnetic fields and increased (Formula presented) at all temperatures and magnetic fields. By measuring (Formula presented) versus temperature, we extract the distribution of vortex pinning energies, (Formula presented). Both crystals have peaks in (Formula presented) near 0.1 eV and 0.2 eV before irradiation, and a much reduced peak near 0.1 eV after irradiation. The noise level after either kind of irradiation was substantially higher than in an unirradiated YBCO film.

Original languageEnglish
Pages (from-to)15411-15416
Number of pages6
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume54
Issue number21
DOIs
StatePublished - 1 Jan 1996

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Critical currents
Magnetic flux
Ion bombardment
ion irradiation
magnetic flux
Protons
critical current
Irradiation
protons
irradiation
Temperature distribution
Vortex flow
Magnetic fields
Crystals
temperature distribution
Spectral density
SQUIDs
vortices
magnetic fields
Ions

Cite this

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title = "Effects of 3.1-MeV proton and 1-GeV Au-ion irradiation on the magnetic flux noise and critical current",
abstract = "We have used a dc superconducting quantum interference device to measure the spectral density of magnetic flux noise, (Formula presented), generated by vortex motion in crystals of (Formula presented) (YBCO) both before and after irradiation with 3.1-MeV protons and 1-GeV Au ions. In addition, we have studied the effects of irradiation on the critical current (Formula presented) of the same samples. Both types of irradiation reduced (Formula presented) at most temperatures and magnetic fields and increased (Formula presented) at all temperatures and magnetic fields. By measuring (Formula presented) versus temperature, we extract the distribution of vortex pinning energies, (Formula presented). Both crystals have peaks in (Formula presented) near 0.1 eV and 0.2 eV before irradiation, and a much reduced peak near 0.1 eV after irradiation. The noise level after either kind of irradiation was substantially higher than in an unirradiated YBCO film.",
author = "T. Shaw and John Clarke and {van Dover}, R. and Lynn Schneemeyer and A. White",
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Effects of 3.1-MeV proton and 1-GeV Au-ion irradiation on the magnetic flux noise and critical current. / Shaw, T.; Clarke, John; van Dover, R.; Schneemeyer, Lynn; White, A.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 54, No. 21, 01.01.1996, p. 15411-15416.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Effects of 3.1-MeV proton and 1-GeV Au-ion irradiation on the magnetic flux noise and critical current

AU - Shaw, T.

AU - Clarke, John

AU - van Dover, R.

AU - Schneemeyer, Lynn

AU - White, A.

PY - 1996/1/1

Y1 - 1996/1/1

N2 - We have used a dc superconducting quantum interference device to measure the spectral density of magnetic flux noise, (Formula presented), generated by vortex motion in crystals of (Formula presented) (YBCO) both before and after irradiation with 3.1-MeV protons and 1-GeV Au ions. In addition, we have studied the effects of irradiation on the critical current (Formula presented) of the same samples. Both types of irradiation reduced (Formula presented) at most temperatures and magnetic fields and increased (Formula presented) at all temperatures and magnetic fields. By measuring (Formula presented) versus temperature, we extract the distribution of vortex pinning energies, (Formula presented). Both crystals have peaks in (Formula presented) near 0.1 eV and 0.2 eV before irradiation, and a much reduced peak near 0.1 eV after irradiation. The noise level after either kind of irradiation was substantially higher than in an unirradiated YBCO film.

AB - We have used a dc superconducting quantum interference device to measure the spectral density of magnetic flux noise, (Formula presented), generated by vortex motion in crystals of (Formula presented) (YBCO) both before and after irradiation with 3.1-MeV protons and 1-GeV Au ions. In addition, we have studied the effects of irradiation on the critical current (Formula presented) of the same samples. Both types of irradiation reduced (Formula presented) at most temperatures and magnetic fields and increased (Formula presented) at all temperatures and magnetic fields. By measuring (Formula presented) versus temperature, we extract the distribution of vortex pinning energies, (Formula presented). Both crystals have peaks in (Formula presented) near 0.1 eV and 0.2 eV before irradiation, and a much reduced peak near 0.1 eV after irradiation. The noise level after either kind of irradiation was substantially higher than in an unirradiated YBCO film.

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U2 - 10.1103/PhysRevB.54.15411

DO - 10.1103/PhysRevB.54.15411

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EP - 15416

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

SN - 1098-0121

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