Universality and unconventional enhancement of flux-flow resistivity in Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$

Abstract

Measurements of the current-voltage characteristics were performed on Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ single crystals with doping level $0.044\le x\le 0.1$. An unconventional increase in the flux-flow resistivity ${\rho }_{\mathrm{ff}}$ with decreasing magnetic field was observed across this doping range. Such an abnormal field dependence of flux-flow resistivity is in contrast with the linear field dependence of ${\rho }_{\mathrm{ff}}$ in conventional type-II superconductors, but is similar to the behavior recently observed in the heavy-fermion superconductor CeCoIn${}_5$. A significantly enhanced ${\rho }_{\mathrm{ff}}$ was found for the x=0.06 single crystals, implying a strong single-particle energy dissipation around the vortex cores. At different temperatures and fields and for a given doping concentration, the normalized ${\rho }_{\mathrm{ff}}$ scales with normalized field and temperature. The doping level dependence of these parameters strongly suggests that the abnormal upturn flux-flow resisitivity is likely related to the enhancement of spin fluctuations around the vortex cores of the optimally doped samples.

arXiv comment9 pages, 7 figures

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Cited by in corpus (2)

• Pressure tuned superconductivity and normal state behavior in Ba(Fe${}_{0.943}$Co${}_{0.057}$)${}_2$As${}_2$ near the antiferromagnetic boundary
• Relationship between critical current and flux-flow resistivity in the mixed state of Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$