Abstract
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. Here 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.
| Original language | English |
|---|---|
| Article number | L060504 |
| Journal | Physical Review B |
| Volume | 106 |
| Issue number | 6 |
| DOIs | |
| State | Published - Aug 1 2022 |
Funding
This work is supported by the Innovation Program of Shanghai Municipal Education Commission (Grant No. 2017-01-07-00-07-E00018), the National Natural Science Foundation of China (Grant No. 11874119), and the Shanghai Municipal Science and Technology Major Project (Grant No. 2019SHZDZX01). China National Postdoctoral Program for Innovative Talents (Grant No. BX2021080), China Postdoctoral Science Foundation (Grant No. 2020M700860) and Shanghai Post-doctoral Excellence Program (Grant No. 2021481). A portion of this research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory.