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Hydrostatic pressure induced transition from δtC to δℓ pinning mechanism in MgB2

Journal Article


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Abstract


  • The impact of hydrostatic pressure up to 1.2 GPa on the critical current density (Jc) and the nature of the pinning mechanism in MgB2 have been investigated within the framework of the collective theory. We found that the hydrostatic pressure can induce a transition from the regime where pinning is controlled by spatial variation in the critical transition temperature to the regime controlled by spatial variation in the mean free path Furthermore, critical temperature (Tc) and low field Jc are slightly reduced, although the Jc drops more quickly at high fields than at ambient pressure. We found that the pressure raises the anisotropy and reduces the coherence length, resulting in weak interaction of the vortex cores with the pinning centres. Moreover, the hydrostatic pressure can reduce the density of states [Ns (E)], which, in turn, leads to a reduction in the Tc from 39.7 K at P=0 GPa to 37.7 K at P=1.2 GPa.

Authors


  •   Shabbir, Babar (external author)
  •   Wang, Xiaolin
  •   Ghorbani, Shaban (external author)
  •   Dou, Shi Xue
  •   Xiang, Feixiang (external author)

Publication Date


  • 2015

Citation


  • Shabbir, B., Wang, X. L., Ghorbani, S. R., Dou, S. X. & Xiang, F. (2015). Hydrostatic pressure induced transition from δtC to δℓ pinning mechanism in MgB2. Superconductor Science and Technology, 28 (5), 055001-1-055001-5.

Scopus Eid


  • 2-s2.0-84927654248

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=4965&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/3946

Has Global Citation Frequency


Start Page


  • 055001-1

End Page


  • 055001-5

Volume


  • 28

Issue


  • 5

Place Of Publication


  • United Kingdom

Abstract


  • The impact of hydrostatic pressure up to 1.2 GPa on the critical current density (Jc) and the nature of the pinning mechanism in MgB2 have been investigated within the framework of the collective theory. We found that the hydrostatic pressure can induce a transition from the regime where pinning is controlled by spatial variation in the critical transition temperature to the regime controlled by spatial variation in the mean free path Furthermore, critical temperature (Tc) and low field Jc are slightly reduced, although the Jc drops more quickly at high fields than at ambient pressure. We found that the pressure raises the anisotropy and reduces the coherence length, resulting in weak interaction of the vortex cores with the pinning centres. Moreover, the hydrostatic pressure can reduce the density of states [Ns (E)], which, in turn, leads to a reduction in the Tc from 39.7 K at P=0 GPa to 37.7 K at P=1.2 GPa.

Authors


  •   Shabbir, Babar (external author)
  •   Wang, Xiaolin
  •   Ghorbani, Shaban (external author)
  •   Dou, Shi Xue
  •   Xiang, Feixiang (external author)

Publication Date


  • 2015

Citation


  • Shabbir, B., Wang, X. L., Ghorbani, S. R., Dou, S. X. & Xiang, F. (2015). Hydrostatic pressure induced transition from δtC to δℓ pinning mechanism in MgB2. Superconductor Science and Technology, 28 (5), 055001-1-055001-5.

Scopus Eid


  • 2-s2.0-84927654248

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=4965&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/3946

Has Global Citation Frequency


Start Page


  • 055001-1

End Page


  • 055001-5

Volume


  • 28

Issue


  • 5

Place Of Publication


  • United Kingdom