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 journalArticle

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.

LanguageEnglish
Article number085014
JournalAIP Advances
Volume7
Issue number8
DOIs
StatePublished - 2017 Aug 1

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critical current
sintering
quenching
current density
thermal stresses
liquid nitrogen
contraction
electrons
grain size
transition temperature
Raman spectra
temperature
cells

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Enhanced electron-phonon coupling and critical current density in rapid thermally quenched MgB2 bulk samples. / Suraj, T. S.; Muralidhar, M.; Sethupathi, K.; Rao, M. S.Ramachandra; Masato, M.

In: AIP Advances, Vol. 7, No. 8, 085014, 01.08.2017.

Research output: Contribution to journalArticle

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