Hall effect in intrinsic type II superconductors near the lower critical field

Transport properties of high-T c cuprate thin films as superconductive materials

“…The vectors for the current density j and the Lorentz force j × φ 0 are also indicated. E has an angle of Θ φ with respect to j. mixed state of high-T c cuprates but has been found in some Pb-In (Weijsenfeld 1968), Nb (VanBeelen et al 1967, Noto et al 1976) and V (Usui et al 1969) low-T c systems as well. Therefore, some authors (Hagen et al 1990(Hagen et al , 1991(Hagen et al , 1993Chien et al 1991;Wang et al 1991;Kopnin et al 1993) believe that the effect is rather general and needs an explanation in terms of general properties of vortex dynamics, which are not specific for the mixed state of high-T c superconductors alone.…”

ANOMALOUS HALL EFFECT NEAR Tc IN HIGH-Tc SUPERCONDUCTORS

“…1, the Hall coefficient is negative in the temperature range 84 to 80 K where the resistance ρ drops to zero. When the magnetic field is lowered to 0.5 T, the Hall coefficient exhibits a re-entry behavior from negative into positive at the temperature 83.2 K. Such anomalous sign change of hall coefficient was also observed in conventional superconductors Nb and V. [4][5][6] The Hall anomaly has been seen in both hole-like and electron-like high-T c superconductors. 7 The early theories of flux flow developed by Bardeen-Stephen 1 and by Nozieres-Vinen 8 predict that the sign of Hall coefficient in the mixed state remains the same as in the normal state.…”

Double sign reversal of the Hall effect in the mixed state ofYBa2Cu3O<

“…Although the origin of the sign reversal has not been clarified yet, 3-8 the mechanism seems not to be related to peculiarities of oxide high-T c materials, because the sign reversal has also been observed for low-T c materials. [9][10][11] In addition to the sign reversal near T c , a second sign reversal has been observed in Bi 2 Sr 2 CaCu 2 O x , 12 Tl 2 Ba 2 CaCu 2 O 8 , 4,13 ͑BiPb͒ 2 Sr 2 Ca 2 Cu 3 O d , 14 Tl 2 Ba 2 Ca 2 Cu 3 O d , 14 and HgBa 2 CaCu 2 O 6ϩd . 15 In these materials, the sign of the Hall effect is positive in the normal state and changes to negative near T c and becomes positive again at a lower temperature that depends on magnetic field.…”