NMR 研究铁硒化物 Rb0.74Fe1.6Se2：确定超导相为无铁空位的 Rb0.3Fe2Se2。
NMR study in the iron-selenide Rb0.74Fe1.6Se2: determination of the superconducting phase as iron vacancy-free Rb0.3Fe2Se2.
机构信息
Laboratoire de Physique des Solides, Univ. Paris-Sud, UMR8502, CNRS, F-91405 Orsay Cedex, France.
出版信息
Phys Rev Lett. 2012 Jun 8;108(23):237002. doi: 10.1103/PhysRevLett.108.237002.
77Se and 87Rb nuclear magnetic resonance (NMR) experiments on Rb0.74Fe1.6Se2 reveal clearly distinct spectra originating from a majority antiferromagnetic (AF) and a minority metallic-superconducting (SC) phase. The very narrow NMR line of the SC phase evidences the absence of Fe vacancies and any trace of AF order. The Rb content of the SC phase is deduced from intensity measurements identifying Rb(0.3(1))Fe2Se2 as the actual composition of the SC fraction. The resulting estimate of 0.15 electrons/Fe brings this class of superconductors 245 family closer to the other Fe-based superconductor families.
77Se 和 87Rb 核磁共振（NMR）实验表明，Rb0.74Fe1.6Se2 存在明显的反铁磁（AF）和金属超导（SC）相。SC 相的 NMR 线很窄，表明不存在 Fe 空位和任何 AF 序。通过强度测量确定 SC 相的 Rb 含量，表明 Rb(0.3(1))Fe2Se2 是 SC 相的实际组成。由此估计的每个 Fe 原子携带 0.15 个电子，这使得这类超导体更接近其他 Fe 基超导体家族。
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