Journal Article

PUBDB-2025-00149

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Discovery of charge order above room-temperature in the prototypical kagome superconductor $La(Ru_{1−x}Fe_x)_3Si_2$

Plokhikh, I. ; Mielke, C. ; Nakamura, H. ; Petricek, V. ; Qin, Y. ; Sazgari, V. ; Küspert, J.Extern* ; Biało, I. ; Shin, S. ; Ivashko, O.Extern*DESY* ; Graham, J. N. ; Zimmermann, M. v.DESY* ; Medarde, M. ; Amato, A. ; Khasanov, R. ; Luetkens, H. ; Fischer, M. H. ; Hasan, M. Z. ; Yin, J.-X. ; Neupert, T. ; Chang, J. ; Xu, G. ; Nakatsuji, S. ; Pomjakushina, E. ; Gawryluk, D. J. (Corresponding author) ; Guguchia, Z. (Corresponding author)Extern*

2024
Springer Nature London

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Please use a persistent id in citations: doi:10.1038/s42005-024-01673-y  doi:10.3204/PUBDB-2025-00149

Abstract: The kagome lattice is an intriguing and rich platform for discovering, tuning and understanding the diverse phases of quantum matter, crucial for advancing modern and future electronics. Despite considerable efforts, accessing correlated phases at room temperature has been challenging. Using single-crystal X-ray diffraction, we discovered charge order above room temperature in La(Ru1−xFex)3Si2 (x = 0, 0.01, 0.05), where charge order related to out-of-plane Ru atom displacements appears below TCO,I  ≃ 400 K. The secondary charge ordered phase emerges below TCO,II  ≃ 80–170 K. Furthermore, first principles calculations reveal both the kagome flat band and the van Hove point near the Fermi energy in LaRu3Si2, driven by Ru-dz2 orbitals. Our results identify LaRu3Si2 as the kagome superconductor with the highest known charge ordering temperature, offering a promising avenue for researching room temperature quantum phases and developing related technologies.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)
2. PETRA-D (FS-PETRA-D)

Research Program(s):

1. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)
2. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)

Experiment(s):

1. PETRA Beamline P21.1 (PETRA III)

Appears in the scientific report 2024

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