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Superconductivity, Kondo physics, and magnetic order: Tuning the ground state in the La1−xCexFeSiH solid solution through the interplay between 3d and 4f correlated electrons

J. Sourd1,2,3, B. Vignolle2, E. Gaudin2, S. Burdin1, and S. Tencé2

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Phys. Rev. B 113, 035120 – Published 12 January, 2026

DOI: https://doi.org/10.1103/f1xt-1x8g

Abstract

We report a study of the La1−xCexFeSiH solid solution (0≤x≤1), a family of intermetallic hydrides of ZrCuSiAs-type structure, with space group P4/nmm. For low cerium concentrations x≤0.20, we observe the presence of superconductivity, which originates from the correlated 3d electrons of iron. The superconducting regime is progressively suppressed by the cerium substitution. For moderate cerium concentration 0.07≤x≤0.50, we observe evidence of the single-ion Kondo effect and no magnetic phase transition down to 2 K. For 0.07≤x≤0.20, the single-ion Kondo effect coexists with a superconducting ground state at low temperatures. From x>0.50, we observe signatures of Kondo coherence and a heavy Fermi liquid regime at low temperature. Finally, at high cerium concentration x≥0.85, we observe signatures of magnetic ordering at low temperatures. We discuss our results by introducing temperature scales related to superconductivity, the Kondo effect, and magnetic order, which permits building a rich phase diagram temperature versus cerium content x. This shows that using the cerium concentration x as a unique control parameter, we can explore the Kondo entanglement between correlated 3d and 4f electrons, which suggests an unusual change between the superconducting state related to the 3d electrons and the Kondo coherent state involving both 3d and 4f electrons.

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Outline

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Phys. Rev. B 113, 035120– Published 12 January, 2026
  • Received 21 July 2025
  • Revised 15 December 2025
  • Accepted 23 December 2025
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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