Thickness controlled proximity effects in C-type antiferromagnet/superconductor heterostructure.
Thickness controlled proximity effects in C-type antiferromagnet/superconductor heterostructure.
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DOI：
10.1038/srep12780
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发表时间：
2015-08-04
影响因子：
4.6
通讯作者：
Lin JG
中科院分区：
文献类型：
--
作者：
Mani A;Geetha Kumary T;Lin JG
研究了Nd0.35Sr0.65MnO_3/YBa2Cu3O_7异质结中具有C型反铁磁相的超导态的调制，Nd0.35Sr0.65MnO_3的厚度(T)从40~200 nm变化。超导转变温度和沿c轴的上临界场均随t的增加而降低，而面内相干长度从2.0 nm增加到3.6 nm。同时，临界电流密度表现出与场无关的行为，表明磁通钉扎效应增强。此外，低温自旋倾斜导致超导电性击穿和重新进入，显示了超导配对和交换场之间的动态完成。在t = 2 0 0 nm处，在超导再入温度以下观察到一个意想不到的巨磁电阻，这归因于交换场对配对能量的主要影响.
Modulation of the superconducting state possessing a C-type antiferromagnetic phase in the Nd0.35Sr0.65MnO3/YBa2Cu3O7 heterostructure is investigated, with the Nd0.35Sr0.65MnO3 thickness (t) varying from 40 to 200 nm. Both the superconducting transition temperature and the upper critical field along the c-axis decrease with increasing t; while the in-plane coherence length increases from 2.0 up to 3.6 nm. Meanwhile, the critical current density exhibits a field-independent behavior, indicating an enhanced flux pinning effect. Furthermore, low-temperature spin canting induces a breakdown and re-entrance of the superconductivity, demonstrating a dynamic completion between the superconducting pairing and the exchange field. An unexpected colossal magnetoresistance is observed below the superconducting re-entrance temperature at t = 200 nm, which is attributed to the dominant influence of the exchange field over the pairing energy.