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

T. S. Suraj; Muralidhar Miryala; K. Sethupathi; M. S.Ramachandra Rao; Masato Murakami

doi:10.1063/1.5000259

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

T. S. Suraj, Muralidhar Miryala, K. Sethupathi, M. S.Ramachandra Rao, Masato Murakami

Research output: Contribution to journal › Article

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 (J_c) and irreversibility fields (H_irr) compared to doped MgB₂ were observed without compromising transition temperature T_c. 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 J_c and H_irr.

Original language	English
Article number	085014
Journal	AIP Advances
Volume	7
Issue number	8
DOIs	https://doi.org/10.1063/1.5000259
Publication status	Published - 2017 Aug 1

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ASJC Scopus subject areas

Physics and Astronomy(all)

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Suraj, T. S., Miryala, M., Sethupathi, K., Rao, M. S. R., & Murakami, M. (2017). Enhanced electron-phonon coupling and critical current density in rapid thermally quenched MgB₂ bulk samples. AIP Advances, 7(8), [085014]. https://doi.org/10.1063/1.5000259

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10.1063/1.5000259