Searching for a general trend of orbital differentiation tuning in FeAs-based superconductors

MATHEUS RADAELLI; MÁRIO M. PIVA; CAMILO B. R. JESÚS; GUILLERME G. LESSEUX; DINA TOBIA; RICARDO URBANO; PASCOAL G. PAGLIUSO

Hangzhou

Conferencia; International Conference on Strongly Correlated Electron Systems; 2016

FeAs-based superconductors are an interesting playground to understand the interplay between superconductivity and magnetism. The tuning of a Spin Density Wave (SDW) phase to lower temperatures seems to play an important role in the emergence of superconductivity in these classes of compounds. So to further understand the microscopic mechanism of such suppression can shed some light on the pairing mechanism of these superconductors. Previous reports concerning studies of spin dynamics by Electron Spin Resonance (ESR) technique in Ba1-xEuxFe2As2 and BaFe2-x(Cu,Mn)xAs2 provide evidence for the role of the Fe 3d bands orbital differentiation in the suppression of the antiferromagnetic SDW phase in this class of materials. Therefore, in these work, we will discuss how this interpretation can be extended to Sr1-xEuxFe2As2 and SrFe2-x(Cu,Mn)xAs2. To achieve our goal we have performed x-ray powder diffraction, elemental analysis (EDS, WDS), resistivity, magnetization, magnetic susceptibility DC and specific heat measurements on In-flux grown single crystals of these compounds.