Title :
Hall effect and Hall resistivity in REBa2Cu3O 7-δ
Author :
Thier, N. ; Winzer, K.
Author_Institution :
Phys. Inst., Gottingen Univ., West Germany
fDate :
3/1/1989 12:00:00 AM
Abstract :
Results of Hall effect and Hall resistivity measurements for single-phase REBa2Cu3O7-δ (RE=Y, Sm, Gd, Dy, Tm, Yb) and YBa2Cu3O7-δ single crystals around and above Tc are reported. For all polycrystalline samples the Hall numbers V 0/RHe are positive and show a linear temperature dependence in the range 120 K<T<300 K. Between 80 K and 95 K a nonlinear behavior of the Hall resistivity ρ xy as a function of the magnetic field B with a change of sign is observed in all polycrystalline samples. The strong field dependence of ρxy near Tc can be attributed to the effect of grain boundaries which can dominate the Hall resistivity by their low carrier concentration. In contrast to the polycrystals the single crystals show a linear field dependence above Tc and no change of sign in ρxy
Keywords :
Hall effect; barium compounds; carrier density; grain boundaries; high-temperature superconductors; rare earth compounds; 80 to 300 K; DyBa2Cu3O7-δ; GdBa2Cu3O7-δ; Hall effect; Hall numbers; Hall resistivity; REBa2Cu3O7-δ; SmBa2Cu3O7-δ; TmBa2Cu3O7-δ; YBa2Cu3O7-δ single crystals; grain boundaries; high temperature superconductors; linear temperature dependence; low carrier concentration; nonlinear behavior; polycrystalline samples; single-phase; strong field dependence; Conductivity; Copper; Crystallization; Crystals; Hall effect; Magnetic field measurement; Superconducting materials; Superconductivity; Temperature dependence; Voltage;
Journal_Title :
Magnetics, IEEE Transactions on
