Enhanced electron-phonon coupling and critical current density in rapid thermally quenched MgB2 bulk samples | Zendy

T. S. Suraj | Zendy; M. Muralidhar | Zendy; K. Sethupathi | Zendy; M. S. Ramachandra Rao | Zendy; M. Murakami | Zendy

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Enhanced electron-phonon coupling and critical current density in rapid thermally quenched MgB2 bulk samples

Author(s) -

T. S. Suraj,

M. Muralidhar,

K. Sethupathi,

M. S. Ramachandra Rao,

M. Murakami

Publication year - 2017

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.5000259

Subject(s) - materials science , condensed matter physics , phonon , sintering , raman spectroscopy , quenching (fluorescence) , thermal expansion , transition temperature , superconductivity , composite material , physics , quantum mechanics , optics , fluorescence

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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