Evidence for Local Moment by Electron Spin Resonance Study on Polycrystalline LaFeAsO${}_{1-x}$F${}_x$ (x=0 and 0.13)

T. Wu, J. J. Ying, G. Wu +7

The temperature dependence of electron spin resonance (ESR) was studied in the oxypnictide superconductors LaFeAsO${}_{1-x}$F${}_x$ (x = 0.0 and 0.13). In the samples, the ESR signal i…