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

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

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) c...

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Main Authors: T. S. Suraj, M. Muralidhar, K. Sethupathi, M. S. Ramachandra Rao, M. Murakami
Format: Article
Language:English
Published: AIP Publishing LLC 2017-08-01
Series:AIP Advances
Online Access:http://dx.doi.org/10.1063/1.5000259
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spelling doaj-d2ec1d0b0cee4ccd9c2344951af5e6622020-11-25T00:10:42ZengAIP Publishing LLCAIP Advances2158-32262017-08-0178085014085014-810.1063/1.5000259051708ADVEnhanced electron-phonon coupling and critical current density in rapid thermally quenched MgB2 bulk samplesT. S. Suraj0M. Muralidhar1K. Sethupathi2M. S. Ramachandra Rao3M. Murakami4Department of Physics, Nano Functional Materials Technology Centre and Materials Science Research Centre, Indian Institute of Technology Madras, Chennai 600036, IndiaSuperconducting Materials Laboratory, Graduate School of Science and Engineering, Shibaura Institute of Technology, Tokyo 135-8548, JapanDepartment of Physics, Low Temperature Physics Laboratory, Indian Institute of Technology Madras, Chennai 600036, IndiaDepartment of Physics, Nano Functional Materials Technology Centre and Materials Science Research Centre, Indian Institute of Technology Madras, Chennai 600036, IndiaSuperconducting Materials Laboratory, Graduate School of Science and Engineering, Shibaura Institute of Technology, Tokyo 135-8548, JapanWe 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.http://dx.doi.org/10.1063/1.5000259
collection DOAJ
language English
format Article
sources DOAJ
author T. S. Suraj
M. Muralidhar
K. Sethupathi
M. S. Ramachandra Rao
M. Murakami
spellingShingle T. S. Suraj
M. Muralidhar
K. Sethupathi
M. S. Ramachandra Rao
M. Murakami
Enhanced electron-phonon coupling and critical current density in rapid thermally quenched MgB2 bulk samples
AIP Advances
author_facet T. S. Suraj
M. Muralidhar
K. Sethupathi
M. S. Ramachandra Rao
M. Murakami
author_sort T. S. Suraj
title Enhanced electron-phonon coupling and critical current density in rapid thermally quenched MgB2 bulk samples
title_short Enhanced electron-phonon coupling and critical current density in rapid thermally quenched MgB2 bulk samples
title_full Enhanced electron-phonon coupling and critical current density in rapid thermally quenched MgB2 bulk samples
title_fullStr Enhanced electron-phonon coupling and critical current density in rapid thermally quenched MgB2 bulk samples
title_full_unstemmed Enhanced electron-phonon coupling and critical current density in rapid thermally quenched MgB2 bulk samples
title_sort enhanced electron-phonon coupling and critical current density in rapid thermally quenched mgb2 bulk samples
publisher AIP Publishing LLC
series AIP Advances
issn 2158-3226
publishDate 2017-08-01
description 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.
url http://dx.doi.org/10.1063/1.5000259
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AT mmuralidhar enhancedelectronphononcouplingandcriticalcurrentdensityinrapidthermallyquenchedmgb2bulksamples
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AT msramachandrarao enhancedelectronphononcouplingandcriticalcurrentdensityinrapidthermallyquenchedmgb2bulksamples
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