The mixed-state Hall conductivity of single-crystal films   $Nd_{2-x}Ce_xCuO_{4+\delta}$ (x=0.14)
  The magnetic-field dependencies of the longitudinal and Hall resistivity of the electron-doped compounds $Nd_{2-x}Ce_xCuO_{4+\delta}$ in underdoped region (x=0.14) were investigated. It was established experimentally a strong magnetic field dependence of the Hall conductivity, $\sigma_{xy}(B)=C-b/B$, in the region of magnetic fields corresponding to a transition from superconducting to resistive state. The observed feature can be explained with the sum of contributions of the quasiparticles and moving Abrikosov vortices into Hall effect in a mixed state of type-II superconductor. 
N. G. Shelushinina, G. I. Harus, T. B. Charikova, D. S. Petukhov, O.   E. Petukhova, A. A. Ivanov
cond-mat.supr-con