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arXiv 1202.3146cond-mat.supr-con
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自旋三重态超导体Sr2RuO4介观环中的非常规量子振荡

Unconventional quantum oscillations in mesoscopic rings of spin-triplet superconductor Sr2RuO4

X. Cai, Y. A. Ying, N. E. Staley, Y. Xin, D. Fobes, T. J. Liu, Z. Q. Mao, Y. Liu

摘要:

奇宇称自旋三重态超导体Sr 2 RuO 4具有奇异的涡旋物理特性,包括在双连接样品中捕获的半通量量子和在低场下形成涡旋晶格。在这项工作中,这些涡旋状态上的Sr 2 RuO 4的介观样品的低温磁阻行为的后果进行了研究,使用的机械剥离的Sr 2 RuO 4单晶光刻和聚焦离子束上制作的环形装置。当垂直于面内方向施加磁场时,发现Sr 2 RuO 4薄壁环表现出明显的量子振荡,具有常规的全通量量子周期,尽管意外的大振幅和振荡次数表明观察到涡旋流主导的磁电阻振荡,而不是传统的利特尔-帕克斯效应。对于环与厚壁,两个不同的量子振荡周期被发现在高和低场制度,分别,我们认为是与“锁定”的涡旋晶格在这些厚壁环。没有证据表明半通量量子电阻振荡被确定在任何样品测量到目前为止,没有一个面内场的存在。

英文摘要:

Odd-parity, spin-triplet superconductor Sr2RuO4 has been found to feature exotic vortex physics including half-flux quanta trapped in a doubly connected sample and the formation of vortex lattices at low fields. The consequences of these vortex states on the low-temperature magnetoresistive behavior of mesoscopic samples of Sr2RuO4 were investigated in this work using ring device fabricated on mechanically exfoliated single crystals of Sr2RuO4 by photolithography and focused ion beam. With the magnetic field applied perpendicular to the in-plane direction, thin-wall rings of Sr2RuO4 were found to exhibit pronounced quantum oscillations with a conventional period of the full-flux quantum even though the unexpectedly large amplitude and the number of oscillations suggest the observation of vortex-flow-dominated magnetoresistance oscillations rather than a conventional Little-Parks effect. For rings with a thick wall, two distinct periods of quantum oscillations were found in high and low field regimes, respectively, which we argue to be associated with the "lock-in" of a vortex lattice in these thick-wall rings. No evidence for half-flux-quantum resistance oscillations were identified in any sample measured so far without the presence of an in-plane field.

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