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

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

doi:10.1063/1.5000259

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

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

Research output: Contribution to journal › Article › peer-review

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

ASJC Scopus subject areas

Physics and Astronomy(all)

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

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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T1 - Enhanced electron-phonon coupling and critical current density in rapid thermally quenched MgB2 bulk samples

AU - Suraj, T. S.

AU - Muralidhar, M.

AU - Sethupathi, K.

AU - Rao, M. S.Ramachandra

AU - Masato, M.

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AB - 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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