Absence of superconductivity in the hole-doped Fe pnictide Ba(Fe1-xMnx)(2)As-2: Photoemission and x-ray absorption spectroscopy studies

作者：Suzuki H^*; Yoshida T; Ideta S; Shibata G; Ishigami K; Kadono T; Fujimori A; Hashimoto M; Lu D H; Shen Z X; Ono K; Sakai E; Kumigashira H; Matsuo M; Sasagawa T

来源：Physical Review B, 2013, 88(10): 100501.

DOI：10.1103/PhysRevB.88.100501

We have studied the electronic structure of Ba(Fe1-xMnx)(2)As-2 (x = 0.08), which fails to become a superconductor in spite of the formal hole doping like Ba1-xKxFe2As2, with photoemission spectroscopy and x-ray absorption spectroscopy (XAS). With decreasing temperature, a transition from the paramagnetic phase to the antiferromagnetic phase was clearly observed by angle-resolved photoemission spectroscopy. XAS results indicated that the substituted Mn atoms form a strongly hybridized ground state. Resonance-photoemission spectra at the Mn L-3 edge revealed that the Mn 3d partial density of states is distributed over a wide energy range of 2-13 eV below the Fermi level (EF), with little contribution around EF. This indicates that the dopant Mn 3d states are localized in spite of the strong Mn 3d-As 4p hybridization and split into the occupied and unoccupied parts due to the on-site Coulomb and exchange interaction. The absence of superconductivity in Ba(Fe1-xMnx)(2)As-2 can thus be ascribed both to the absence of carrier doping in the FeAs plane and to the stabilization of the competing G-type antiferromagnetic order by the Mn impurities.

• 出版日期2013-9-3