Frustrated magnetic interactions in FeSe

Gu, Yiqing; Wang, Qisi; Wo, Hongliang; He, Zheng; Walker, Helen C.; Park, Jitae T.; Enderle, Mechthild; Christianson, Andrew D.; Wang, Wenbin; Zhao, Jun

doi:10.1103/physrevb.106.l060504

Frustrated magnetic interactions in FeSe

Journal Article · Thu Aug 18 04:00:00 EDT 2022 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.106.l060504· OSTI ID:1883759

^[1]; ^[2]; ^[1]; He, Zheng ^[3]; ^[4]; Park, Jitae T. ^[5]; Enderle, Mechthild ^[6]; ^[7]; Wang, Wenbin ^[3]; ^[8]

Fudan Univ., Shanghai (China); Shanghai Qi Zhi Inst. (China)
Fudan Univ., Shanghai (China); Univ. of Zurich (Switzerland)
Fudan Univ., Shanghai (China)
Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Rutherford Appleton Lab. (RAL)
Technical Univ. of Munich (Germany)
Inst. Laue-Langevin (ILL), Grenoble (France)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Fudan Univ., Shanghai (China); Shanghai Qi Zhi Inst. (China); Shanghai Research Center for Quantum Sciences (China)

The structurally simplest high-temperature superconductor FeSe exhibits an intriguing superconducting nematic paramagnetic phase with unusual spin excitation spectra that are different from typical spin waves; thus, determining its effective magnetic exchange interactions is challenging. In this work, we report neutron scattering measurements of spin fluctuations of FeSe in the tetragonal paramagnetic phase. We show that the equal-time magnetic structure factor, S(Q), can be effectively modeled using the self-consistent Gaussian approximation calculation with highly frustrated nearest-neighbor (J₁) and next-nearest-neighbor (J₂) exchange couplings, and very weak further neighbor exchange interaction. Our results elucidate the frustrated magnetism in FeSe, which provides a natural explanation for the highly tunable superconductivity and nematicity in FeSe and related materials.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); Shanghai Municipal Education Commission; National Natural Science Foundation of China (NSFC); Shanghai Municipal Science and Technology Major Project

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1883759

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 6 Vol. 106; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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