【摘要】 在 10mm× 10mmSrTiO3 (STO)台阶衬底上用单层YBa2 Cu3 O7-δ(YBCO)薄膜制备了dc SQUID一阶平面梯度计 ,探测环面积约为 33mm2 ,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× 10 2 ,磁场梯度灵敏度为 8PT/cmHz(白噪声区 ) .更多还原

【Abstract】 A dc\|SQUID planar gradiometer has been fabricated with YBa\-2Cu\-3O\-\{7-δ\} step\|edge Josephson junctions on a 10?mm×10?mm single crystal SrTiO\-3 [100] substrate. The gradiometer has a pair of pickup loops with an area of 33 mm\+2 and the baseline of 4 5?mm. The system operates well in unshielded environment. A rejection of common mode fields of 1 4×10 2 in all directions and a field gradient sensitivity (white noise) better than 8?pT/cmHz at 77?K have been achieved.更多还原