Site specific spin dynamics in BaFe2As2: tuning the ground state by orbital differentiation

Autor:	Rosa, P. F. S., Adriano, C., Garitezi, T. M., Grant, T., Fisk, Z., Urbano, R. R., Pagliuso, P. G.
Rok vydání:	2014
Předmět:	Condensed Matter - Superconductivity
Druh dokumentu:	Working Paper
Popis:	The role of orbital differentiation on the emergence of superconductivity in the Fe-based superconductors remains an open question to the scientific community. In this investigation, we employ a suitable microscopic spin probe technique, namely Electron Spin Resonance (ESR), to investigate this issue on selected chemically substituted BaFe$_{2}$As$_{2}$ single crystals. As the spin-density wave (SDW) phase is suppressed, we observe a clear increase of the Fe 3$d$ bands anisotropy along with their localization at the FeAs plane. Such an increase of the planar orbital content interestingly occurs independently on the chemical substitution responsible for suppressing the SDW phase. As a consequence, the magnetic fluctuations combined with the resultant particular symmetry of the Fe 3$d$ bands are propitious ingredients to the emergence of superconductivity in this class of materials. Comment: 6 pages, 5 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1402.2001 Zobrazit plný text záznamu View this record from Arxiv