TRANSPORT-PROPERTIES OF YBA2CU3O7-X CAMOO3 MULTILAYERS IN A MAGNETIC-FIELD/

The transport properties of superconducting YBa2Cu3O7-x/CaMoO3 (YBCO/C MO) multilayers in the mixed-state were measured to study the effects of magnetic field, flux pinning and current density on the behaviors o f Hall coefficient. The superconducting critical temperature was reduc ed due to the presence of CMO layers. The longitudinal resistivities u nder a magnetic field parallel to the c-axis shows a thermally activat ed behavior and pinning energy decreases with an increasing magnetic f ields or currents applied. The pinning abilities are also affected by the thickness of YBCO or CMO layers. The negative Hall coefficient in the mixed-state depends on the flux pinning and decreases as the pinni ng force decreases. The results are consistent with the Wang and Ting' s model [10].