Vortex phase diagram of Ba(Fe0.93Co0.07)2As2 single crystals

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dc.creatorProzorov, R.
dc.creatorNi, N.
dc.creatorTanatar, M. A.
dc.creatorKogan, V. G.
dc.creatorGordon, R. T.
dc.creatorMartin, C.
dc.creatorBlomberg, E. C.
dc.creatorPrommapan, P.
dc.creatorYan, J. Q.
dc.creatorBud'ko, S. L.
dc.creatorCanfield, P. C.
dc.date2008-10-08
dc.date.accessioned2026-07-07T12:27:56Z
dc.date.available2026-07-07T12:27:56Z
dc.descriptionDetailed measurements of the global and local electromagnetic properties of Ba(Fe$_{0.93}$Co$_{0.07}$)$_{2}$As$_{2}$ single crystals are reported. Analysis of the irreversible magnetic response provides strong evidence for similar vortex physics in this Fe-based pnictide superconductor to the high-$T_{c}$ cuprates, such as Y-Ba-Cu-O or Nd-Ce-Cu-O. In particular, we have found a nonmonotonic "fishtail" magnetization in $M(H,T=const)$ loops and its signature is also present in $M(H=const,T)$ scans. The supercurrent density is evaluated by using several techniques, including direct transport measurements. At 5 K we estimate its value to be a moderate $j \approx 2.6 \pm 0.2 \times 10^5$ A/cm$^2$. Analysis of the magnetic relaxation is consistent with the collective pinning and creep models (weak pinning and fast creep) and suggests a crossover from the collective to the plastic creep regime in fields exceeding the value corresponding to the maximum in fishtail magnetization.
dc.identifierhttps://arxiv.org/abs/0810.1338
dc.identifierhttp://arxiv.org/abs/0810.1338
dc.identifierPhys. Rev. B 78, 224506 (2008)
dc.identifierdoi:10.1103/PhysRevB.78.224506
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/215375
dc.subjectSuperconductivity
dc.titleVortex phase diagram of Ba(Fe0.93Co0.07)2As2 single crystals
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