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arXiv 1004.5449cond-mat.supr-con
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局域输运测量证明Sr2RuO4-Ru结中DC电流驱动的临界电流变化

DC Current Driven Critical Current Variation in Sr2RuO4-Ru Junction Proved by Local Transport Measurements

Hiroshi Kambara, Tetsuro Matsumoto, Hiromi Kashiwaya, Satoshi Kashiwaya, Hiroshi Yaguchi, Yasuhiro Asano, Yukio Tanaka, Yoshiteru Maeno

摘要:

为了寻找Sr 2 RuO 4中存在手征p波超导畴的新证据,我们研究了微加工Sr 2 RuO 4-Ru共晶结的非常规局域输运特性。我们发现,在电压-电流特性的异常滞后[如H。Kambara等人:物理修订信函101(2008)267003.]受到直流电流的强烈影响,但不受磁场的影响。这表明,直流电流作为驱动力移动手征p波畴壁;畴壁被困在钉扎电位被迫转移到下一个稳定的位置,从而形成一个更大的临界电流路径,并导致异常滞后。

英文摘要:

To search for new evidence of the chiral p-wave superconducting domain in Sr2RuO4, we investigated the unconventional local transport characteristics of a microfabricated Sr2RuO4-Ru eutectic junction. We found that the anomalous hysteresis in voltage-current characteristics [as reported in H. Kambara et al.: Phys. Rev. Lett. 101 (2008) 267003.] is strongly affected by dc currents, but not by magnetic fields. This suggests that dc current acts as a driving force to move chiral p-wave domain walls; a domain wall trapped at a pinning potential is forced to shift to the next stable position, thereby forming a larger critical current path and resulting in the anomalous hysteresis.

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