高温超导台阶结YBCO dc-SQUID一阶平面梯度计

在10mm×10mm SrTiO₃(STO)台阶衬底上用单层YBa₂Cu₃ O_7-δ(YBCO)薄膜制备了dc-SQUID一阶平面梯度计，探测环面积约为33mm ²，基线长度d=45mm.该梯度计在无屏蔽条件下对地磁场有较好的屏蔽作用，共模抑 制比为14×10²，磁场梯度灵敏度为8PT/cmHz(白噪声区).关键词：台阶结SQUID平面梯度计

YBCO STEP-EDGE JUNCTION DC-SQUID PLANAR GRADIOMETER

A dc-SQUID planar gradiometer has been fabricated with YBa₂Cu_{3O7-δ step-edge Josephson junctions on a 10mm×10mm single crysta l SrTiO3 ［100］ substrate. The gradiometer has a pair of pickup loop s with an area of 33 mm² and the baseline of 45mm. The system opera tes well in unshielded environment. A rejection of common mode fields of 14×1 0² in all directions and a field gradient sensitivity (white noise) b etter than 8pT/cmHz at 77K have been achieved.}