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

We used resonant inelastic x-ray scattering (RIXS) and dynamical susceptibility calculations to study the magnetic excitations in NaFe 1$-$xCo xAs ( 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. Nonetheless, Co doping slightly reduces the overall magnetic spectral weight, differently from previous studies on hole-doped BaFe 2As 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.
Authors:
 [1] ;  [2] ;  [3] ;  [1] ;  [4] ;  [1] ;  [1] ;  [5] ;  [5] ;  [6] ;  [1]
  1. Paul Scherrer Inst. (PSI), Villigen (Switzerland). Dept. of Synchrotron Radiation and Nanotechnology
  2. Paul Scherrer Inst. (PSI), Villigen (Switzerland). Dept. of Synchrotron Radiation and Nanotechnology; Chinese Academy of Sciences (CAS), Beijing (China). Beijing National Lab. for Condensed Matter Physics, Inst. of Physics
  3. Indian Inst. of Science, Bangalore (India). Dept. of Physics
  4. Paul Scherrer Inst. (PSI), Villigen (Switzerland). Dept. of Synchrotron Radiation and Nanotechnology; Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
  5. Chinese Academy of Sciences (CAS), Beijing (China). Beijing National Lab. for Condensed Matter Physics, Inst. of Physics
  6. Chinese Academy of Sciences (CAS), Beijing (China). Beijing National Lab. for Condensed Matter Physics, Inst. of Physics; Collaborative Innovation Center for Quantum Matters, Beijing (China)
Publication Date:
Report Number(s):
BNL-112579-2016-JA
Journal ID: ISSN 2469-9950; PRBMDO
Grant/Contract Number:
SC0012704; 200021L 141325
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 93; Journal Issue: 13; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1340388