Hysteresis and stepwise structure in MR curves of granular superconducting ruthenocuprates RuSr2(Gd1.5Ce0.5)Cu2O10 Academic Article uri icon

abstract

  • Granular superconductivity effects in a polycrystalline sample of ruthenocuprate RuSr2(Gd1.5Ce0.5)Cu 2O10- are studied. The main attention has been devoted to manifestation of these effects in current and magnetic-field dependences of resistive transition to superconducting state. It is found that current dependences of resistance taken at different temperatures intersect strictly at two definite values of current demonstrating crossing point effects. This phenomenon has been explained taking into account inhomogeneous state of intergrain medium which can be considered as a two-component system. The particular attention has been given to magnetoresistance (MR) hysteresis in mixed state of this inhomogeneous system and to influence of applied current and temperature on this phenomenon. Two types of hysteresis (clockwise and anticlockwise) have been found with transition from clockwise to anticlockwise hysteresis with increasing temperature. Stepwise structure in MR hysteretic curves has been observed in low-field range. Possible reasons of the change in hysteresis behavior with increasing temperature and appearance of the stepwise structure in MR curves are discussed taking into consideration inhomogeneous state of the granular superconductor studied. 2012 Elsevier B.V. All rights reserved.

published proceedings

  • Physica C: Superconductivity

author list (cited authors)

  • Belevtsev, B. I., Beliayev, E. Y., Naugle, D. G., & Rathnayaka, K.

publication date

  • January 1, 2012 11:11 AM