Preferred Spin Excitations in the Bilayer Iron-Based Superconductor $CaK(Fe_{0.96}Ni_{0.04})_4As_4$ with Spin-Vortex Crystal Order

Liu, Chang; Bourges, Philippe; Sidis, Yvan; Xie, Tao; He, Guanghong; Bourdarot, Frédéric; Danilkin, Sergey; Ghosh, Haranath; Ghosh, Soumyadeep; Ma, Xiaoyan; Li, Shiliang; Li, Yuan; Luo, Huiqian

doi:10.1103/physrevlett.128.137003

Title: Preferred Spin Excitations in the Bilayer Iron-Based Superconductor $$CaK(Fe_{0.96}Ni_{0.04})_4As_4$$ with Spin-Vortex Crystal Order

Journal Article · Thu Mar 31 00:00:00 EDT 2022 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.128.137003· OSTI ID:1863280

^[1]; Bourges, Philippe ^[2]; Sidis, Yvan ^[2];

^[3]; He, Guanghong ^[4]; Bourdarot, Frédéric ^[5]; Danilkin, Sergey ^[6];

^[7];

^[7]; Ma, Xiaoyan ^[1]; Li, Shiliang ^[8];

^[9];

^[10]

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)
Univ. Paris-Saclay, Gif-sur-Yvette (France). Laboratoire Léon Brillouin; Alternative Energies and Atomic Energy Commission (CEA), Saclay (France)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Peking Univ., Beijing (China). International Center for Quantum Materials
Univ. Grenoble Alpes, Grenoble (France)
Australian Nuclear Science and Technology Organisation (ANSTO), Lucas Heights, NSW (Australia). Australian Centre for Neutron Scattering
Raja Ramanna Centre for Advanced Technology, Indore (India); Homi Bhabha National Inst., Mumbai (India)
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 Lab., Dongguan (China)
Peking Univ., Beijing (China). International Center for Quantum Materials; Collaborative Innovation Center of Quantum Matter, Beijing (China)
Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics. Beijing National Lab. for Condensed Matter Physics (BNLCP-CAS); Songshan Lake Materials Lab., Dongguan (China)

Spin-orbit coupling (SOC) is a key to understand the magnetically driven superconductivity in iron-based superconductors, where both local and itinerant electrons are present and the orbital angular momentum is not completely quenched. Here, we report a neutron scattering study on the bilayer compound CaK(Fe_0.96Ni_0.04)₄As₄ with superconductivity coexisting with a noncollinear spin-vortex crystal magnetic order that preserves the tetragonal symmetry of the Fe-Fe plane. In the superconducting state, two spin resonance modes with odd and even L symmetries due to the bilayer coupling are found similar to the undoped compound CaKFe₄As₄ but at lower energies. Polarization analysis reveals that the odd mode is c-axis polarized, and the low-energy spin anisotropy can persist to the paramagnetic phase at high temperature, which closely resembles other systems with in-plane collinear and c-axis biaxial magnetic orders. Overall, these results provide the missing piece of the puzzle on the SOC effect in iron-pnictide superconductors, and also establish a common picture of c-axis preferred magnetic excitations below T_c regardless of the details of magnetic pattern or lattice symmetry.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; National Key Research and Development Program of China; National Natural Science Foundation of China (NSFC)

Grant/Contract Number:: AC05-00OR22725; 2020YFA0406003; 2018YFA0704200; 2018YFA0305602; 2017YFA0302900; 11822411; 11888101; 11874069; 11961160699; 11674406

OSTI ID:: 1863280

Journal Information:: Physical Review Letters, Vol. 128, Issue 13; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Preferred Spin Excitations in the Bilayer Iron-Based Superconductor $$CaK(Fe_{0.96}Ni_{0.04})_4As_4$$ with Spin-Vortex Crystal Order

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