论文标题
铁磁性超导体EUFE $ _ {2} $（AS $ _ {0.8} $ P $ _ {0.2} $）$ _ {2} $：
Bulk domain Meissner state in the ferromagnetic superconductor EuFe$_{2}$(As$_{0.8}$P$_{0.2}$)$_{2}$: Consequence of compromise between ferromagnetism and superconductivity
论文作者
论文摘要
在铁磁超导体EUFE $ _ {2} $上进行小角度中子散射（SAN）测量（AS $ _ {0.8} $ p $ _ {0.2} $ _ {0.2} $ _ {2}超导性。在铁电磁订购温度下面发现了大型铁磁域的明确特征，$ t \ rm_ {c} $ = 18.5 K.在$ \ sim $ 1.5 k以下$ \ sim $ 1.5 k以下的较小温度间隔下NM。这些纳米尺度的结构结构被确定为中间不均匀的meissner效应表示域Meissner状态，最近在EUFE $ _ {2} $的表面上观察到该结构（as $ _ {0.79} $ p $ _ {0.21} $ _ {0.21} $ _ {0.21} $ _ {2} $ _ {2} $ {2） S. Stolyarov $ \ Mathit {et} $ $ \ Mathit {al。} $，SCI。 ADV。 4，1061（2018）]，归因于铁磁和超导性之间的竞争。我们的测量清楚地使域迈斯纳状态成为一种批量现象，并为这些化合物中强的铁磁性和散装超导性的有趣共存提供了一个关键解决方案。
Small-angle neutron scattering (SANS) measurements are performed on the ferromagnetic superconductor EuFe$_{2}$(As$_{0.8}$P$_{0.2}$)$_{2}$ ($T\rm_{sc}=22.5\,$K) to probe the delicate interplay between ferromagnetism and superconductivity. A clear signature of large ferromagnetic domains is found below the ferromagnetic ordering temperature $T\rm_{C}$ = 18.5 K. In a small temperature interval of $\sim$ 1.5 K below $T\rm_{C}$, additional SANS signal is observed, of which the indirect Fourier transform reveals characteristic length scales in between $\sim$ 80 nm to $\sim$ 160 nm. These nanometer-scaled domain structures are identified to result from an intermediate inhomogeneous Meissner effect denoted domain Meissner state, which was recently observed on the surface of EuFe$_{2}$(As$_{0.79}$P$_{0.21}$)$_{2}$ crystals by means of magnetic force microscopy [V. S. Stolyarov $\mathit{et}$ $\mathit{al.}$, Sci. Adv. 4, 1061 (2018)], ascribing to the competition between ferromagnetism and superconductivity. Our measurements clearly render the domain Meissner state as a bulk phenomenon and provide a key solution to the mystery regarding the intriguing coexistence of strong ferromagnetism and bulk superconductivity in these compounds.
