异质超导体Sr $_2$ VO $_3$ FeAs中的强反铁磁邻近耦合
Strong antiferromagnetic proximity coupling in a heterostructured superconductor Sr$_2$VO$_3$FeAs
摘要：
本文报道了在异质结构超导体SrPDMATHABMMVOPDMATHABMNFeAs中观测到的强磁邻近耦合，由上临界场$H_{c2}(T)$测量确定，最高可达65 T.使用$H \parallel ab$和$H \parallel c$的电阻率和射频测量，我们发现了一个强大的向上弯曲的$H_{c2}^c(T)$，连同$T_c$附近的$H_{c2}^{ab}(T)$急剧增加，产生的各向异性因子$γ_H=H_{c2}^{ab}/H_{c2}^c$高达$\sim$ 20，最大的值之间的铁基超导体。这些都归因于Jaccarino-Peter效应，而不是多带效应，由于巡回Fe自旋的FeAs层和局部V自旋莫特绝缘SrVO $_3$层之间的强交换相互作用。这些研究结果提供了强反铁磁邻近耦合的证据，与层内超交换相互作用的SrVO $_3$层，足以引起磁挫折锶$_2$ VO $_3$ FeAs。
英文摘要：
We report observation of strong magnetic proximity coupling in a heterostructured superconductor Sr$_2$VO$_3$FeAs, determined by the upper critical fields $H_{c2}(T)$ measurements up to 65 T. Using the resistivity and the radio-frequency measurements for both $H \parallel ab$ and $H \parallel c$, we found a strong upward curvature of $H_{c2}^c(T)$, together with a steep increase of $H_{c2}^{ab}(T)$ near $T_c$, yielding the anisotropic factor $γ_H=H_{c2}^{ab}/H_{c2}^c$ up to $\sim$ 20, the largest value among iron-based superconductors. These are attributed to the Jaccarino-Peter effect, rather than to the multiband effect, due to strong exchange interaction between itinerant Fe spins of the FeAs layers and localized V spins of Mott-insulating SrVO$_3$ layers. These findings provide evidence for strong antiferromagnetic proximity coupling, comparable with the intralayer superexchange interaction of SrVO$_3$ layer and sufficient to induce magnetic frustration in Sr$_2$VO$_3$FeAs.
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