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Reciprocity between local moments and collective magnetic excitations in the phase diagram of BaFe2(As1−xP x)2

Pelliciari, J and Ishii, K and Huang, Y and Dantz, M and Lu, X and Olalde-Velasco, P and Strocov, VN and Kasahara, S and Xing, L and Wang, X and Jin, C and Matsuda, Y and Shibauchi, T and Das, T and Schmitt, T (2019) Reciprocity between local moments and collective magnetic excitations in the phase diagram of BaFe2(As1−xP x)2. In: Communications Physics, 2 (1).

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Official URL: https://doi.org/10.1038/s42005-019-0236-3


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 β emission spectroscopy (XES), we visualize the coexistence and evolution of local magnetic moments and collective spin excitations across the superconducting dome in isovalently-doped BaFe2(As1 − xPx)2 (0.00 ≤ x ≤ 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.

Item Type: Journal Article
Publication: Communications Physics
Publisher: Nature Research
Additional Information: The copyright for this article belongs to the Authors.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 12 Oct 2022 09:35
Last Modified: 12 Oct 2022 09:35
URI: https://eprints.iisc.ac.in/id/eprint/77400

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