摘要
测量 YBa_2Cu_3O_(7-δ)烧结样品的磁致电阻曲线都观测到反常回线,即电阻变化超前于外磁场H 的变化。部分样品的磁致电阻曲线上出现量级为10~2Oe 的周期结构,可以用颗粒超导模型的弱联接的超导量子衍射加以解释,估算结的宽度为0.3μ。
Hysteresis loop has been found when measuring magnetoresistance on YBa_2Cu_3O_(7-δ) bulk samples.A peoriodic structure appears in the experi- mental curves of some samples with a period about 100 Oe.It can be inter- preted by the quantum diffraction effect of weak—link junction in the granular superconductor model.The width of the junction is estimated to be 0.3 micro.
