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Correlated vortex pinning in Si-nanoparticle doped MgB2

Journal Article


Abstract


  • The magnetoresistivity and critical current density of well characterized Si-nanoparticle doped and undoped Cu-sheathed MgB2 tapes have been measured at temperatures T≥28 K in magnetic fields B≤0.9 T. The irreversibility line Birr(T) for doped tape shows a stepwise variation with a kink around 0.3 T. Such irr(T) variation is typical for high-temperature superconductors with columnar defects (a kink occurs near the matching field Bø) and is very different from a smooth Birr(T) variation in undoped MgB2 samples. The microstructure studies of nanoparticle doped MgB2 samples show uniformly dispersed nanoprecipitates, which probably act as a correlated disorder. The observed difference between the field variations of the critical current density and pinning force density of the doped and undoped tape supports the above findings. © 2004 Elsevier Ltd. All rights reserved.

Publication Date


  • 2004

Citation


  • Ku¿evic, I., Babic, E., Husnjak, O., Soltanian, S., Wang, X. L., & Dou, S. X. (2004). Correlated vortex pinning in Si-nanoparticle doped MgB2. Solid State Communications, 132(11), 761-765. doi:10.1016/j.ssc.2004.09.035

Scopus Eid


  • 2-s2.0-9444251126

Start Page


  • 761

End Page


  • 765

Volume


  • 132

Issue


  • 11

Abstract


  • The magnetoresistivity and critical current density of well characterized Si-nanoparticle doped and undoped Cu-sheathed MgB2 tapes have been measured at temperatures T≥28 K in magnetic fields B≤0.9 T. The irreversibility line Birr(T) for doped tape shows a stepwise variation with a kink around 0.3 T. Such irr(T) variation is typical for high-temperature superconductors with columnar defects (a kink occurs near the matching field Bø) and is very different from a smooth Birr(T) variation in undoped MgB2 samples. The microstructure studies of nanoparticle doped MgB2 samples show uniformly dispersed nanoprecipitates, which probably act as a correlated disorder. The observed difference between the field variations of the critical current density and pinning force density of the doped and undoped tape supports the above findings. © 2004 Elsevier Ltd. All rights reserved.

Publication Date


  • 2004

Citation


  • Ku¿evic, I., Babic, E., Husnjak, O., Soltanian, S., Wang, X. L., & Dou, S. X. (2004). Correlated vortex pinning in Si-nanoparticle doped MgB2. Solid State Communications, 132(11), 761-765. doi:10.1016/j.ssc.2004.09.035

Scopus Eid


  • 2-s2.0-9444251126

Start Page


  • 761

End Page


  • 765

Volume


  • 132

Issue


  • 11