Intralayer doping effects on the high-energy magnetic correlations in NaFeAs

We have used resonant inelastic x-ray scattering (RIXS) and dynamical susceptibility calculations to study the magnetic excitations in NaFe sub(1-x) Co sub(x) As (x=0, 0.03, and 0.08). Despite a relatively low ordered magnetic moment, collective magnetic modes are observed in parent compounds (x=0)...

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Bibliographic Details
Published in:Physical review. B 2016-04, Vol.93 (13), Article 134515
Main Authors: Pelliciari, Jonathan, Huang, Yaobo, Das, Tanmoy, Dantz, Marcus, Bisogni, Valentina, Velasco, Paul Olalde, Strocov, Vladimir N., Xing, Lingyi, Wang, Xiancheng, Jin, Changqing, Schmitt, Thorsten
Format: Article
Language:English
Subjects:
Condensed matter
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Constants
Correlation
Doping
Excitation
Magnetic moment
Magnetic permeability
Weight reduction
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Summary:We have used resonant inelastic x-ray scattering (RIXS) and dynamical susceptibility calculations to study the magnetic excitations in NaFe sub(1-x) Co sub(x) As (x=0, 0.03, and 0.08). Despite a relatively low ordered magnetic moment, collective magnetic modes are observed in parent compounds (x=0) and persist in optimally (x=0.03) and overdoped (x=0.08) samples. Their magnetic bandwidths are unaffected by doping within the range investigated. High-energy magnetic excitations in iron pnictides are robust against doping and present irrespectively of the ordered magnetic moment. Nevertheless, Co doping slightly reduces the overall magnetic spectral weight, differently from previous studies on hole-doped BaFe sub(2) As sub(2), where it was observed constant. Finally, we demonstrate that the doping evolution of magnetic modes is different for the dopants being inside or outside the Fe-As layer.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.93.134515