Abstract

To find a cheap and efficient way to produce high performance bulk MgB2 superconductors, a series of samples produced with different contents of carbon-coated, nanometer-sized amorphous boron was prepared to improve the magnetic properties. A single-step solid-state reaction at the optimal reaction temperature of 805 °C for 3 h in pure argon atmosphere was used. Small pieces cut from the bulk were characterized by magnetic hysteresis loop measurements in magnetic fields up to -7 T at temperatures ranging from 5 to 35 K using a physical property measurement system (PPMS). Critical current densities and flux pinning forces were calculated from the magnetization data. The pinning force data of all samples were compared using the Eisterer pinning force scaling approach. The peak positions, h0, were found at h0 ~ 0.33, indicating a dominant flux pinning at the grain boundaries for samples with 50% and 30% carbon-coated boron, while the scaling reveals a peak position of 0.44 for the 10% sample, which indicates pinning at point defects.

Original languageEnglish
JournalIEEE Transactions on Applied Superconductivity
DOIs
Publication statusAccepted/In press - 2018 Jan 1

Fingerprint

Flux pinning
Boron
Carbon
Critical current density (superconductivity)
Magnetic hysteresis
Argon
flux pinning
Point defects
Hysteresis loops
Solid state reactions
Superconducting materials
Magnetization
Magnetic properties
Grain boundaries
boron
Physical properties
Magnetic fields
scaling
Temperature
carbon

Keywords

  • bulk
  • flux pinning
  • irreversibility fields
  • magnetization
  • MgB2
  • scaling

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

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title = "Magnetic characterization of bulk C-added MgB2",
abstract = "To find a cheap and efficient way to produce high performance bulk MgB2 superconductors, a series of samples produced with different contents of carbon-coated, nanometer-sized amorphous boron was prepared to improve the magnetic properties. A single-step solid-state reaction at the optimal reaction temperature of 805 °C for 3 h in pure argon atmosphere was used. Small pieces cut from the bulk were characterized by magnetic hysteresis loop measurements in magnetic fields up to -7 T at temperatures ranging from 5 to 35 K using a physical property measurement system (PPMS). Critical current densities and flux pinning forces were calculated from the magnetization data. The pinning force data of all samples were compared using the Eisterer pinning force scaling approach. The peak positions, h0, were found at h0 ~ 0.33, indicating a dominant flux pinning at the grain boundaries for samples with 50{\%} and 30{\%} carbon-coated boron, while the scaling reveals a peak position of 0.44 for the 10{\%} sample, which indicates pinning at point defects.",
keywords = "bulk, flux pinning, irreversibility fields, magnetization, MgB2, scaling",
author = "Koblischka, {Michael Rudolf} and Koblischka-Veneva, {Anjela Dimitrova} and Muralidhar Miryala and Masato Murakami",
year = "2018",
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AU - Miryala, Muralidhar

AU - Murakami, Masato

PY - 2018/1/1

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N2 - To find a cheap and efficient way to produce high performance bulk MgB2 superconductors, a series of samples produced with different contents of carbon-coated, nanometer-sized amorphous boron was prepared to improve the magnetic properties. A single-step solid-state reaction at the optimal reaction temperature of 805 °C for 3 h in pure argon atmosphere was used. Small pieces cut from the bulk were characterized by magnetic hysteresis loop measurements in magnetic fields up to -7 T at temperatures ranging from 5 to 35 K using a physical property measurement system (PPMS). Critical current densities and flux pinning forces were calculated from the magnetization data. The pinning force data of all samples were compared using the Eisterer pinning force scaling approach. The peak positions, h0, were found at h0 ~ 0.33, indicating a dominant flux pinning at the grain boundaries for samples with 50% and 30% carbon-coated boron, while the scaling reveals a peak position of 0.44 for the 10% sample, which indicates pinning at point defects.

AB - To find a cheap and efficient way to produce high performance bulk MgB2 superconductors, a series of samples produced with different contents of carbon-coated, nanometer-sized amorphous boron was prepared to improve the magnetic properties. A single-step solid-state reaction at the optimal reaction temperature of 805 °C for 3 h in pure argon atmosphere was used. Small pieces cut from the bulk were characterized by magnetic hysteresis loop measurements in magnetic fields up to -7 T at temperatures ranging from 5 to 35 K using a physical property measurement system (PPMS). Critical current densities and flux pinning forces were calculated from the magnetization data. The pinning force data of all samples were compared using the Eisterer pinning force scaling approach. The peak positions, h0, were found at h0 ~ 0.33, indicating a dominant flux pinning at the grain boundaries for samples with 50% and 30% carbon-coated boron, while the scaling reveals a peak position of 0.44 for the 10% sample, which indicates pinning at point defects.

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