Rb2Fe4Se5中反铁磁相和超导相的纳米分层
Nanoscale layering of antiferromagnetic and superconducting phases in Rb2Fe4Se5
摘要：
利用散射型扫描近场光学显微镜（s-SNOM）和低能μ子自旋旋转（LE-μSR）研究了单晶反铁磁超导体Rb_2Fe_4Se_5（RFS）中的相分离.我们发现反铁磁相和超导相在垂直于铁硒化物平面的方向上分离成纳米厚的层，而金属畴的特征面内尺寸达到10 μm。通过LE-μSR，我们进一步表明，在40 nm厚的表面层中，有序反铁磁磁矩急剧减少，而顺磁相的体积分数显著增加。准规则异质结构的自组织表明调制超导相和反铁磁相之间的密切联系。
英文摘要：
We studied phase separation in a single-crystalline antiferromagnetic superconductor Rb2Fe4Se5 (RFS) using a combination of scattering-type scanning near-field optical microscopy (s-SNOM) and low-energy muon spin rotation (LE-μSR). We demonstrate that the antiferromagnetic and superconducting phases segregate into nanometer-thick layers perpendicular to the iron-selenide planes, while the characteristic in-plane size of the metallic domains reaches 10 μm. By means of LE-μSR we further show that in a 40-nm thick surface layer the ordered antiferromagnetic moment is drastically reduced, while the volume fraction of the paramagnetic phase is significantly enhanced over its bulk value. Self-organization into a quasiregular heterostructure indicates an intimate connection between the modulated superconducting and antiferromagnetic phases.
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