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Enhanced electron-phonon coupling and critical current density in rapid thermally quenched MgB2 bulk samples
Published in American Institute of Physics Inc.
2017
Volume: 7
   
Issue: 8
Abstract
We report Rapid Thermal Quenching (RTQ) studies on MgB2 samples from optimized sintering temperature of 800 °C down to liquid nitrogen temperature with different sintering duration. Superior electron-phonon coupling strength (λe-E2g), critical current density (Jc) and irreversibility fields (Hirr) compared to doped MgB2 were observed without compromising transition temperature Tc. Structural studies showed a contraction of the unit cell due to thermal stress induced by RTQ. Enhanced λe-E2g evaluated from line width, and phonon frequency of Raman spectra using Allen equation was consistent with structural and magnetic studies. Microstructural analysis showed a decrease in grain size resulting in increased Jc and Hirr. © 2017 Author(s).
About the journal
JournalData powered by TypesetAIP Advances
PublisherData powered by TypesetAmerican Institute of Physics Inc.
ISSN21583226
Open AccessNo
Concepts (15)
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    Critical currents
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    Current density
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    Electron correlations
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    Electron-phonon interactions
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    Sintering
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    TECHNETIUM COMPOUNDS
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    ELECTRON PHONON COUPLINGS
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    ELECTRON-PHONON COUPLING STRENGTHS
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    IRREVERSIBILITY FIELDS
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    Liquid nitrogen temperature
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    Microstructural analysis
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    SINTERING DURATIONS
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    Sintering temperatures
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    Structural studies
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    MAGNESIUM COMPOUNDS