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.",

author = "Suraj, {T. S.} and M. Muralidhar and K. Sethupathi and Rao, {M. S.Ramachandra} and M. Masato",

note = "Funding Information: The work was supported by Japan Student Services Organization (JASSO), Shibaura Institute of Technology (SIT) under the Top Global University Project, Designed by Ministry of Education, Culture, Sports, Science and Technology in Japan. Publisher Copyright: {\textcopyright} 2017 Author(s).",

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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.

N1 - Funding Information: The work was supported by Japan Student Services Organization (JASSO), Shibaura Institute of Technology (SIT) under the Top Global University Project, Designed by Ministry of Education, Culture, Sports, Science and Technology in Japan. Publisher Copyright: © 2017 Author(s).

PY - 2017/8/1

Y1 - 2017/8/1

N2 - 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.

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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