journal article·2022-08-18Open access

Frustrated magnetic interactions in FeSe

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

Physical Review B· Volume 106· Issue 6

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, $\mathcal{S}(\mathbf{Q})$, can be effectively modeled using the self-consistent Gaussian approximation calculation with highly frustrated nearest-neighbor (${J}1$) and next-nearest-neighbor (${J}2$) 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.
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Research context

OpenAlex topics: Iron-based superconductors research · Advanced Condensed Matter Physics · Physics of Superconductivity and Magnetism

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China

Shanghai Qi Zhi Institute, Shanghai 200232, China

Physik-Institut, Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland

ISIS Facility, Rutherford Appleton Laboratory, STFC, Chilton, Didcot, Oxon OX11 0QX, United Kingdom

Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, 85748 Garching, Germany

Institut Laue-Langevin, Avenue des Martyrs, CS 20156, F-38042 Grenoble Cédex 9, France

Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA

Institute of Nanoelectronics and Quantum Computing, Fudan University, Shanghai 200433, China

Shanghai Research Center for Quantum Sciences, Shanghai 201315, China

Funding

Science and Technology Commission of Shanghai Municipality · Shanghai Municipal Education Commission · National Natural Science Foundation of China · National Postdoctoral Program for Innovative Talents · China Postdoctoral Science Foundation · U.S. Department of Energy · Office of Science · Oak Ridge National Laboratory · Shanghai Post-doctoral Excellence Program

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