Impurity effects on spin dynamics in magnetic and superconducting iron pnictides and chalcogenides
M. A. Surmach, P. Y. Portnichenko, J. T. Park, J. A. Rodriguez-Rivera,, D. L. Sun, Y. Liu, C. T. Lin, D. S. Inosov
TL;DR
This paper reviews how magnetic and nonmagnetic impurities influence spin dynamics in iron-based superconductors and their parent compounds, highlighting experimental findings and new insights into magnetic fluctuations.
Contribution
It provides a comprehensive review of impurity effects on spin dynamics and presents new experimental results on magnetic fluctuations in doped BaFe2As2 crystals.
Findings
Impurities affect the suppression or stabilization of superconductivity.
Magnetic fluctuations are characterized in Mn-doped BaFe2As2.
New neutron spectroscopy data on spin excitations.
Abstract
In this paper we summarize the effects of magnetic and nonmagnetic impurities on the spin dynamics in Febased superconductors and their parent compounds. The effects of chemical substitution, vacancies, and disorder on the suppression or stabilization of superconductivity and spin-density-wave phases are reviewed in the context of recent neutron-spectroscopy measurements of spin excitations. We also present new results on the structure of magnetic fluctuations in BaFe2As2 single crystals doped with Mn local moments and discuss them in relationship to the previously reported (pi, pi) branch of checkerboard magnetic excitations.
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