Nematic Fluctuations in the Non-Superconducting Iron Pnictide BaFe1.9-xNi0.1CrxAs2

Gong, Dongliang; Yi, Ming; Wang, Meng; Xie, Tao; Zhang, Wenliang; Danilkin, Sergey; Deng, Guochu; Liu, Xinzhi; Park, Jitae T.; Ikeuchi, Kazuhiko; Kamazawa, Kazuya; Mo, Sung-Kwan; Hashimoto, Makoto; Lu, Donghui; Zhang, Rui; Dai, Pengcheng; Birgeneau, Robert J.; Li, Shiliang; Luo, Huiqian

doi:10.3389/fphy.2022.886459

Title: Nematic Fluctuations in the Non-Superconducting Iron Pnictide BaFe_1.9-xNi_0.1Cr_xAs₂

Journal Article · Mon Jun 13 00:00:00 EDT 2022 · Frontiers in Physics

DOI:https://doi.org/10.3389/fphy.2022.886459· OSTI ID:1877045

Gong, Dongliang ^[1]; Yi, Ming ^[2]; Wang, Meng ^[3]; Xie, Tao ^[1]; Zhang, Wenliang ^[1]; Danilkin, Sergey ^[4]; Deng, Guochu ^[4]; Liu, Xinzhi ^[3]; Park, Jitae T. ^[5]; Ikeuchi, Kazuhiko ^[6]; Kamazawa, Kazuya ^[6]; Mo, Sung-Kwan ^[7]; Hashimoto, Makoto ^[8]; Lu, Donghui ^[8]; Zhang, Rui ^[9]; Dai, Pengcheng ^[9]; Birgeneau, Robert J. ^[10]; Li, Shiliang ^[11]; Luo, Huiqian ^[12]

Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics. Beijing National Lab. for Condensed Matter Physics (BNLCP-CAS); University of Chinese Academy of Sciences, Beijing (China)
Rice Univ., Houston, TX (United States); Univ. of California, Berkeley, CA (United States)
Sun Yat-Sen Univ., Guangzhou (China)
Australian Nuclear Science and Technology Organisation (ANSTO), Lucas Heights, NSW (Australia). Australian Centre for Neutron Scattering
Technische Univ. Munchen, Garching (Germany). Dept. Physik
Comprehensive Research Organization for Science and Society, Tokai (Japan)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
Rice Univ., Houston, TX (United States)
Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics. Beijing National Lab. for Condensed Matter Physics (BNLCP-CAS); University of Chinese Academy of Sciences, Beijing (China); Songshan Lake Materials Laboratory, Guangdong (China)
Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics. Beijing National Lab. for Condensed Matter Physics (BNLCP-CAS); Songshan Lake Materials Laboratory, Guangdong (China)

The main driven force of the electronic nematic phase in iron-based superconductors is still under debate. Here, we report a comprehensive study on the nematic fluctuations in a non-superconducting iron pnictide system BaFe_1.9-xNi_0.1Cr_xAs₂ by electronic transport, angle-resolved photoemission spectroscopy (ARPES), and inelastic neutron scattering (INS) measurements. Previous neutron diffraction and transport measurements suggested that the collinear antiferromagnetism persists to x = 0.8, with similar Néel temperature TN and structural transition temperature Ts around 32 K, but the charge carriers change from electron type to hole type around x = 0.5. In this study, we have found that the in-plane resistivity 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 for both x = 0.05 and x = 0.5 compounds, INS experiments reveal clearly different onset temperatures of low-energy spin excitation anisotropy, which is likely related to the energy scale of spin nematicity. These results suggest that the interplay between the local spins on Fe atoms and the itinerant electrons on Fermi surfaces is crucial to the nematic fluctuations of iron pnictides, where the orbital degree of freedom may behave differently from the spin degree of freedom, and the transport properties are intimately related to the spin dynamics.

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Research Organization:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Key Research and Development Program of China; National Natural Science Foundation of China (NSFC); Chinese Academy of Sciences KC Wong Education Foundation; Beijing Natural Science Foundation; Guangdong Basic and Applied Basic Research Foundation; Robert A. Welch Foundation

Grant/Contract Number:: AC02-05CH11231; SC0012311; 2018YFA0704200; 2017YFA0303100; 2017YFA0302900; 11822411; 11961160699; 12061130200; XDB25000000; XDB07020300; GJTD-2020-01; JQ19002; 11904414; 12174454; 2021B1515120015; 2019YFA0705702; C-1839

OSTI ID:: 1877045

Journal Information:: Frontiers in Physics, Vol. 10; ISSN 2296-424X

Publisher:: Frontiers Research FoundationCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
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iron-based superconductors
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orbital ordering
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Title: Nematic Fluctuations in the Non-Superconducting Iron Pnictide BaFe_1.9-xNi_0.1Cr_xAs₂