Chemical enhancement of superconductivity in LaRu3Si2 with mode-selective coupling between kagome phonons and flat bands
Ryo Misawa, Markus Kriener, Rinsuke Yamada, Ryota Nakano, Milena Jovanovic, Leslie M. Schoop, Max Hirschberger
DOI 10.1103/rnv1-rbw2 · Physical Review Research
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Abstract
In kagome metals, flat electronic bands induced by frustrated hopping are a platform for strong electron correlations. Here, we investigate the superconductivity in the kagome system LaRu3(Si1−xGex)2 by chemical pressure tuning while preserving the Ru-4d states that constitute the kagome flat bands. We observe a sizable enhancement in the density of states up to x=0.07, as determined by the specific heat, with a concomitant increase in the superconducting transition temperature Tc. Ge dopants induce a uniaxial lattice expansion along the c axis. Our first-principles calculations suggest that this mitigates the detrimental effect of hybridization between kagome layers and reduces the dispersion of the Ru-dx2−y2 flat band. The calculated chemical potential moves closer to the maximum in the energy-dependent density of states. Our result is consistent with a theoretical prediction of tunable flat-band superconductivity in LaRu3Si2 by mode-selective coupling between specific kagome phonons and the Ru-dx2−y2 orbitals.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LaRu3Si2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.7 | Pressure not reported | unknown |
| LaRu3Si2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.6 | Pressure not reported | unknown |
| LaRu3(Si1-xGex)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.1 | Pressure not reported | midpoint |
| LaRu3(Si1-xGex)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.1 | Pressure not reported | onset |
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