Magnetic field induced anisotropy of resistance in YBa2Cu3O<i>x</i> polycrystals
A. M. GlukhovPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR , KharkovN. Ya. Fogel’Physicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR , KharkovI. M. DmitrenkoPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR , KharkovA. S. PokhilaPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR , KharkovI. S. BraudePhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR , KharkovV. V. DemirskiĭPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR , KharkovВ. І. ДоценкоPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR , Kharkov
ABI
Аннотация
A magnetic field induced anisotropy of resistance for different current directions relative to the magnetic field in the superconducting transition region is observed for YBa2Cu3Ox polycrystals with a random equiprobable angular distribution of monocrystalline grain orientations. The anisotropy is shown to be mainly due to the anisotropy in the normal resistance of grains constituting a polycrystal. A stronger anisotropy of the opposite sign is observed in samples with pronounced texture. The anisotropy in isotropic polycrystals vanishes on approaching the percolation threshold and in the vicinity of the superconducting transition temperature.
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