Correlation between the dome-shaped superconducting phase diagram, charge order, and normal-state electronic properties in LaRu3Si2

KeYuan Ma, Igor Plokhikh, Jennifer N. Graham, Charles Mielke, Vahid Sazgari, Hiroto Nakamura, Shams Sohel Islam, Soohyeon Shin, Petr Král, Orion Gerguri, Hubertus Luetkens, Fabian O. Rohr, Jiaxin Yin, Ekaterina Pomjakushina, Claudia Felser, Satoru Nakatsuji, Björn Wehinger, Dariusz J. Gawryluk, Sergey Medvedev () and Zurab Guguchia ()
Additional contact information
KeYuan Ma: Max Planck Institute for Chemical Physics of Solids
Igor Plokhikh: PSI Center for Neutron and Muon Sciences CNM
Jennifer N. Graham: PSI Center for Neutron and Muon Sciences CNM
Charles Mielke: PSI Center for Neutron and Muon Sciences CNM
Vahid Sazgari: PSI Center for Neutron and Muon Sciences CNM
Hiroto Nakamura: University of Tokyo, Kashiwa
Shams Sohel Islam: PSI Center for Neutron and Muon Sciences CNM
Soohyeon Shin: PSI Center for Neutron and Muon Sciences CNM
Petr Král: PSI Center for Neutron and Muon Sciences CNM
Orion Gerguri: PSI Center for Neutron and Muon Sciences CNM
Hubertus Luetkens: PSI Center for Neutron and Muon Sciences CNM
Fabian O. Rohr: University of Geneva
Jiaxin Yin: Southern University of Science and Technology, Shenzhen
Ekaterina Pomjakushina: PSI Center for Neutron and Muon Sciences CNM
Claudia Felser: Max Planck Institute for Chemical Physics of Solids
Satoru Nakatsuji: University of Tokyo
Björn Wehinger: European Synchrotron Radiation Facility
Dariusz J. Gawryluk: PSI Center for Neutron and Muon Sciences CNM
Sergey Medvedev: Max Planck Institute for Chemical Physics of Solids
Zurab Guguchia: PSI Center for Neutron and Muon Sciences CNM

Nature Communications, 2025, vol. 16, issue 1, 1-9

Abstract: Abstract The interplay between superconductivity and charge or spin order is a key focus in condensed matter physics, with kagome lattice systems providing unique insights. The kagome superconductor LaRu3Si2 (Tc ≃ 6.5 K) features a characteristic kagome band structure and a hierarchy of charge order transitions at Tco,I ≃ 400 K and Tco,II ≃ 80 K, along with an additional transition at T* ≃ 35 K associated with electronic and magnetic responses. Using magnetotransport under pressure up to 40 GPa, we find Tc peaks at 9 K (2 GPa)—the highest among kagome superconductors—remains nearly constant up to 12 GPa, and then decreases to 2 K at 40 GPa, forming a dome-shaped phase diagram. Similarly, both the resistivity anomaly at T* and the magnetoresistance exhibit a dome-shaped pressure dependence. Moreover, above 12 GPa, X-ray diffraction reveals that the charge order evolves from long-range to short-range, coinciding with the suppression of Tc. These observations indicate that superconductivity in LaRu3Si2 is closely linked to the charge-ordered state and the electronic responses at Tco,II and T*.

Date: 2025
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DOI: 10.1038/s41467-025-61383-z

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