期刊
PHYSICAL REVIEW LETTERS
卷 128, 期 15, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.128.157206
关键词
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资金
- European Research Council (ERC) under the European Union [856538]
- Deutsche Forschungsgemeinschaft (DFG) [SPP 2137, BL 444/16, SFB 1238]
- UK EPSRC [EP/M028941/1]
- RWTH Aachen University [jara0219, jara3dmagic]
- Supercomputer Centre Julich [jara0219, jara3dmagic]
We investigate the correlation between Fermi surface structure and spin spiral ground state in intermetallic compounds GdRu2Si2 and Gd2PdSi3 using first principles and spin dynamic simulations, providing a mechanism explanation for the observed transition temperatures and magnetic periods in experiments.
We show from first principles that barrel-shaped structures within the Fermi surface of the centrosymmetric intermetallic compounds GdRu2Si2 and Gd2PdSi3 give rise to Fermi surface nesting, which determines the strength and sign of quasi-two-dimensional Ruderman-Kittel-Kasuya-Yosida pairwise exchange interactions between the Gd moments. This is the principal mechanism leading to their helical single-q spin-spiral ground states, providing transition temperatures and magnetic periods in good agreement with experiment. Using atomistic spin-dynamic simulations, we draw a direct line between the subtleties of the three-dimensional Fermi surface topology and the stabilization of a square skyrmion lattice in GdRu2Si2 at applied magnetic fields as observed in experiment.
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