Reciprocity between local moments and collective magnetic excitations in the phase diagram of BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$

Abstract

Unconventional superconductivity arises at the border between the strong coupling regime with local magnetic moments and the weak coupling regime with itinerant electrons, and stems from the physics of criticality that dissects the two. Unveiling the nature of the quasiparticles close to quantum criticality is fundamental to understand the phase diagram of quantum materials. Here, using resonant inelastic x-ray scattering (RIXS) and Fe-K${}_{\beta }$ emission spectroscopy (XES), we visualize the coexistence and evolution of local magnetic moments and collective spin excitations across the superconducting dome in isovalently-doped BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$ (0.00$\le$x$\le 0.$52). Collective magnetic excitations resolved by RIXS are gradually hardened, whereas XES reveals a strong suppression of the local magnetic moment upon doping. This relationship is captured by an intermediate coupling theory, explicitly accounting for the partially localized and itinerant nature of the electrons in Fe pnictides. Finally, our work identifies a local-itinerant spin fluctuations channel through which the local moments transfer spin excitations to the particle-hole (paramagnons) continuum across the superconducting dome.

arXiv commentAccepted in Communications Physics

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• Spin-excitation anisotropy in the nematic state of detwinned FeSe
• Tuning spin excitations in magnetic films by confinement
• Description of resonant inelastic x-ray scattering in correlated metals
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• Resonant Inelastic X-ray Scattering Study of Ca${}_3$Ru${}_2$O${}_7$
• Nematic spin correlations pervading the phase diagram of FeSe${}_{1-x}$S${}_x$
• Dispersionless orbital excitations in (Li,Fe)OHFeSe superconductors
• Incoherent electronic band states in Mn-substituted BaFe${}_2$As${}_2$
• Spin dynamics in NaFeAs and NaFe${}_{0.53}$Cu${}_{0.47}$As probed by resonant inelastic X-ray scattering