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Hydrostatic pressure-induced huge enhancement of critical current density and flux pinning in Fe1-xCoxSe0.5Te0.5 single crystals

Journal Article


Abstract


  • We performed a systematic study of the hydrostatic pressure (HP) effect on the supercon-ducting transition temperature (T c ), critical current density (J c ), irreversibility field (H irr ), upper critical field (H c2 ), and flux pinning mechanism in un-doped and 3 at.% Co-doped FeSe 0.5 Te 0.5 crystals. We found that T c is increased from 11.5 to 17 K as HP increases from 0 to 1.2 GPa. Remarkably, the J c is significantly enhanced by a factor of 3 to 100 for low and high temperature and field, and the H irr line is shifted to higher fields by HP up to 1.2 GPa. Based on the collective pinning model, the δl pinning associated with charge-carrier mean free path fluctuation is responsible for the pinning mechanism of Fe 1-x Co x Se 0.5 Te 0.5 samples with or without pressure. A comprehensive vortex phase diagram in the mixed state is constructed and analysed for the 3 at.% Co-doped sample.

Authors


  •   Sang, Lina (external author)
  •   Shabbir, Babar (external author)
  •   Maheshwari, Pankaj (external author)
  •   Qiu, Wenbin (external author)
  •   Ma, Zongqing (external author)
  •   Dou, Shi Xue
  •   Cai, Chuanbing (external author)
  •   Awana, Veer Pal Singh (external author)
  •   Wang, Xiaolin

Publication Date


  • 2018

Citation


  • Sang, L., Shabbir, B., Maheshwari, P., Qiu, W., Ma, Z., Dou, S., Cai, C., Awana, V. & Wang, X. (2018). Hydrostatic pressure-induced huge enhancement of critical current density and flux pinning in Fe1-xCoxSe0.5Te0.5 single crystals. Superconductor Science and Technology, 31 (2), 025009-1-025009-9.

Scopus Eid


  • 2-s2.0-85040679707

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/2917

Has Global Citation Frequency


Start Page


  • 025009-1

End Page


  • 025009-9

Volume


  • 31

Issue


  • 2

Place Of Publication


  • United Kingdom

Abstract


  • We performed a systematic study of the hydrostatic pressure (HP) effect on the supercon-ducting transition temperature (T c ), critical current density (J c ), irreversibility field (H irr ), upper critical field (H c2 ), and flux pinning mechanism in un-doped and 3 at.% Co-doped FeSe 0.5 Te 0.5 crystals. We found that T c is increased from 11.5 to 17 K as HP increases from 0 to 1.2 GPa. Remarkably, the J c is significantly enhanced by a factor of 3 to 100 for low and high temperature and field, and the H irr line is shifted to higher fields by HP up to 1.2 GPa. Based on the collective pinning model, the δl pinning associated with charge-carrier mean free path fluctuation is responsible for the pinning mechanism of Fe 1-x Co x Se 0.5 Te 0.5 samples with or without pressure. A comprehensive vortex phase diagram in the mixed state is constructed and analysed for the 3 at.% Co-doped sample.

Authors


  •   Sang, Lina (external author)
  •   Shabbir, Babar (external author)
  •   Maheshwari, Pankaj (external author)
  •   Qiu, Wenbin (external author)
  •   Ma, Zongqing (external author)
  •   Dou, Shi Xue
  •   Cai, Chuanbing (external author)
  •   Awana, Veer Pal Singh (external author)
  •   Wang, Xiaolin

Publication Date


  • 2018

Citation


  • Sang, L., Shabbir, B., Maheshwari, P., Qiu, W., Ma, Z., Dou, S., Cai, C., Awana, V. & Wang, X. (2018). Hydrostatic pressure-induced huge enhancement of critical current density and flux pinning in Fe1-xCoxSe0.5Te0.5 single crystals. Superconductor Science and Technology, 31 (2), 025009-1-025009-9.

Scopus Eid


  • 2-s2.0-85040679707

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/2917

Has Global Citation Frequency


Start Page


  • 025009-1

End Page


  • 025009-9

Volume


  • 31

Issue


  • 2

Place Of Publication


  • United Kingdom