Enhanced electron-phonon coupling and critical current density in rapid thermally quenched MgB2 bulk samples
Source abstract
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.
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Research context
OpenAlex topics: Superconductivity in MgB2 and Alloys · Thermal Expansion and Ionic Conductivity · Physics of Superconductivity and Magnetism
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Physics, Nano Functional Materials Technology Centre and Materials Science Research Centre, Indian Institute of Technology Madras 1 , Chennai 600036, India
Superconducting Materials Laboratory, Graduate School of Science and Engineering, Shibaura Institute of Technology 2 , Tokyo 135-8548, Japan
Department of Physics, Low Temperature Physics Laboratory, Indian Institute of Technology Madras 3 , Chennai 600036, India
Funding
Japan Student Services Organization (JASSO), Shibaura Institute of Technology
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