Journal Article

IMPULSE-2022-00229

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Nematic Fluctuations in the Non-Superconducting Iron Pnictide BaFe$_{1.9−x}$Ni$_{0.1}$Cr$_x$As$_2$

Gong, D. (First author) ; Yi, M. ; Wang, M. ; Xie, T. ; Zhang, W. ; Danilkin, S. ; Deng, G. ; Liu, X. ; Park, J. T.MLZ* ; Ikeuchi, K. ; Kamazawa, K. ; Mo, S.-K. ; Hashimoto, M. ; Lu, D. ; Zhang, R. ; Dai, P. ; Birgeneau, R. J. ; Li, S. ; Luo, H. (Corresponding author)

2022
Frontiers Media Lausanne

Please use a persistent id in citations: doi:10.3389/fphy.2022.886459

Abstract: The main driven force of the electronic nematic phase in iron-based superconductors is stillunder debate. Here, we report a comprehensive study on the nematic fluctuations in anon-superconducting iron pnictide system BaFe1.9−xNi0.1CrxAs2 by electronic transport,angle-resolved photoemission spectroscopy (ARPES), and inelastic neutron scattering(INS) measurements. Previous neutron diffraction and transport measurements suggestedthat the collinear antiferromagnetism persists to x = 0.8, with similar Néel temperature TNand structural transition temperature Ts around 32 K, but the charge carriers change fromelectron type to hole type around x = 0.5. In this study, we have found that the in-planeresistivity anisotropy also highly depends on the Cr dopings and the type of charge carriers.While ARPES measurements suggest possibly weak orbital anisotropy onset near Ts forboth x = 0.05 and x = 0.5 compounds, INS experiments reveal clearly different onsettemperatures of low-energy spin excitation anisotropy, which is likely related to the energyscale of spin nematicity. These results suggest that the interplay between the local spins onFe atoms and the itinerant electrons on Fermi surfaces is crucial to the nematic fluctuationsof iron pnictides, where the orbital degree of freedom may behave differently from the spindegree of freedom, and the transport properties are intimately related to the spin dynamics.

Keyword(s): Magnetic Materials (1st) ; Condensed Matter Physics (2nd) ; Magnetism (2nd) ; Materials Science (2nd)

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Contributing Institute(s):

1. PUMA (PUMA)
2. QUANTUM (QUANTUM)

Experiment(s):

1. PUMA: Thermal three axes spectrometer (SR7)
2. Measurement at external facility

Appears in the scientific report 2022

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