Journal Article

FZJ-2024-01129

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Crystal Thermal Transport in Altermagnetic RuO 2

Zhou, X. ; Feng, W. (Corresponding author) ; Zhang, R.-W. ; Šmejkal, L. ; Sinova, J. ; Mokrousov, Y.FZJ* ; Yao, Y.

2024
APS College Park, Md.

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Please use a persistent id in citations: doi:10.1103/PhysRevLett.132.056701  doi:10.34734/FZJ-2024-01129

Abstract: We demonstrate the emergence of a pronounced thermal transport in the recently discovered class of magnetic materials—altermagnets. From symmetry arguments and first-principles calculations performed for the showcase altermagnet, RuO2, we uncover that crystal Nernst and crystal thermal Hall effects in this material are very large and strongly anisotropic with respect to the N ́eel vector. We find the large crystal thermal transport to originate from three sources of Berry’s curvature in momentum space: the Weyl fermions due to crossings between well-separated bands, the strong spin-flip pseudonodal surfaces, and the weak spin- flip ladder transitions, defined by transitions among very weakly spin-split states of similar dispersion crossing the Fermi surface. Moreover, we reveal that the anomalous thermal and electrical transport coefficients in RuO2 are linked by an extended Wiedemann-Franz law in a temperature range much wider than expected for conventional magnets. Our results suggest that altermagnets may assume a leading role inrealizing concepts in spin caloritronics not achievable with ferromagnets or antiferromagnets

Note: Joint Sino-German Research Projects (Chinese Grant No. 12061131002 and German Research Foundation, DFG, Grant No. 44880005), the Sino-German Mobility Programme (Grant No. M-0142) and DFG-TRR 288- 422213477 and DFG-TRR 173/2-268565370.

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Contributing Institute(s):

1. Quanten-Theorie der Materialien (PGI-1)
2. Quanten-Theorie der Materialien (IAS-1)

Research Program(s):

1. 5211 - Topological Matter (POF4-521) (POF4-521)
2. DFG project 444844585 - Statische und dynamische Kopplung von Gitter- und elektronischen Freiheitsgraden in magnetisch geordneten Übergangsmetalldichalkogenieden (B06) (444844585) (444844585)
3. DFG project 437337265 - Spin+Optik: Theoretischer Entwurf von antiferromagnetischer Optospintronik (A11) (437337265) (437337265)

Appears in the scientific report 2024

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