The interpretation of improved flux pinning behaviour and second magnetization peaks observed in overdoped Cu-rich Bi2Sr2CaCu2O8+x single crystals

Y. Zhao, C. H. Cheng, Y. Feng, S. Shibata, N. Koshizuka, Masato Murakami

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The irreversibility line and second magnetization peak of heavily overdoped Cu-rich Bi2Sr2CaCu2O8+x (Bi2212) single crystals are studied by accurate magnetization measurements with a field H ∥ c. Compared with optimally-doped and Pb-doped Bi2212 single crystals, the present system exhibits an enhanced pinning behaviour and higher dimensional crossover field. The temperature dependences of the critical current densities at the first and the second peaks exhibit different behaviour before and after the dimensional crossover. Above the crossover field, the irreversibility line obeys an exponential temperature dependence. Our results suggest that the second peak is caused by the switch of the flux pinning from three-dimensional flux line pinning to two-dimensional (2D) collective pinning, and the irreversibility line is the depinning line of the 2D vortex lattice.

Original languageEnglish
JournalSuperconductor Science and Technology
Volume17
Issue number2
DOIs
Publication statusPublished - 2004 Feb

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Flux pinning
flux pinning
Magnetization
crossovers
Single crystals
magnetization
single crystals
temperature dependence
Vortex flow
Switches
Fluxes
doped crystals
Temperature
critical current
switches
vortices
current density

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

The interpretation of improved flux pinning behaviour and second magnetization peaks observed in overdoped Cu-rich Bi2Sr2CaCu2O8+x single crystals. / Zhao, Y.; Cheng, C. H.; Feng, Y.; Shibata, S.; Koshizuka, N.; Murakami, Masato.

In: Superconductor Science and Technology, Vol. 17, No. 2, 02.2004.

Research output: Contribution to journalArticle

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