arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1002.1430cond-mat.supr-con
收藏

磁场冷却下Sr_{2} RuO_{4}中手性序参量畴的排列

Alignment of chiral order parameter domains in Sr_{2} RuO_{4} by magnetic field cooling

Francoise Kidwingira, Joel D. Strand, D. J. Van Harlingen, Yoshiteru Maeno

摘要:

Sr $_{2}$ RuO $_{4}$的超导电性是非常规的,被认为是$p_{x}\pm ip_{y}$配对对称的。这两个简并序参量允许形成由畴壁分隔的手性畴。在Sr $_{2}$ RuO $_{4}$单晶边缘上形成的约瑟夫森结中,手性畴可以在隧穿方向上产生相位变化,引起抑制和调制结的临界电流的干涉效应。在磁场中冷却的结升降机之间的序参量状态的简并和诱导的优先手征,显着修改相位干涉。我们目前的实验结果Sr $_{2}$ RuO $_{4}$ /Cu/Pb约瑟夫森结在磁场冷却显示其临界电流的显着增强,提供直接证据的手性域的存在和它们的排列在磁场。

英文摘要:

Superconductivity in Sr$_{2}$RuO$_{4}$ is unconventional, believed to be of $p_{x}\pm ip_{y}$ pairing symmetry. These two degenerate order parameters allow the formation of chiral domains separated by domain walls. In a Josephson junction formed on the edge of a single crystal of Sr$_{2}$RuO$_{4}$, the chiral domains can create a variation of the phase in the tunneling direction causing interference effects which suppress and modulate the critical current of the junction. Cooling the junction in a magnetic field lifts the degeneracy between the order parameter states and induces a preferential chirality, significantly modifying the phase interference. We present experimental results on Sr$_{2}$RuO$_{4}$/Cu/Pb Josephson junctions cooled in a magnetic field showing a dramatic enhancement of their critical current, giving direct evidence for the presence of chiral domains and their alignment in a magnetic field.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑