Superconducting coupling across a spin-filtering manganite tunnel barrier with magnetic disorder
Superconducting coupling across a spin-filtering manganite tunnel barrier with magnetic disorder
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DOI：
10.1209/0295-5075/115/67005
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发表时间：
2016-09
期刊：
影响因子：
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通讯作者：
T. Harada;M. Matvejeff;R. Takahashi;M. Lippmaa
中科院分区：
文献类型：
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作者：
T. Harada;M. Matvejeff;R. Takahashi;M. Lippmaa
制备了Nb/Au/Pr 0.8Ca 0.2MnO 3/La 1.85 Sr 0.15 CuO 4铁磁绝缘体约瑟夫森结。非线性的电流-电压特性表明Nb/Au和La_（1.85）Sr_（0.15）Cu_（0.15）O_4层之间存在超导耦合。隧穿谱显示出明显的电导峰，由于准粒子隧穿。从隧道谱确定的超导能隙与结的临界电流的温度依赖性是一致的。我们认为，磁不均匀性在超导隧道势垒中起着连接Nb/Au和La 1.85 Sr 0.15 CuO 4的超导态的作用。
Ferromagnetic insulator Josephson junctions consisting of Nb/Au/Pr0.8Ca0.2MnO3/La1.85Sr0.15CuO4 layers were fabricated. Non-linear current-voltage characteristics suggest the presence of superconducting coupling between the Nb/Au and La1.85Sr0.15CuO4 layers across a ferromagnetic Pr0.8Ca0.2MnO3 tunnel barrier. Tunneling spectra showed clear conductance peaks due to quasi-particle tunneling. Superconducting gap energies determined from the tunneling spectra were consistent with the temperature dependence of the critical current of the junctions. We argue that magnetic inhomogeneity in the ultrathin tunnel barrier plays a role in linking the superconducting states in Nb/Au and La1.85Sr0.15CuO4.