Abstract
In this work, we report the pressure-dependent evolution of superconductivity in cage-like compound Y5Rh6Sn18 by combining electrical transport measurements, synchrotron x-ray diffraction (XRD) and theoretical computation. The application of external pressure leads to the enhancement of metallic nature in Y5Rh6Sn18. There is a noted pressure-tunable superconducting temperature (Tc), which climbs to 3.70K at 7.4GPa, and then reverses to 2.37K at the higher pressure of 30.6GPa. High-pressure XRD analysis confirm the robustness of Y5Rh6Sn18, which exhibits stability without transitioning into other structural phases up to approximately 30GPa. The ab initio calculations show a significant contribution of Sn s and p electrons as well as Rh and Y d electrons to the total density of states (DOS) near the Fermi level, which supports the multi-band superconductivity of this compound. The enhancement of Tc in Y5Rh6Sn18 could be explained by the strengthening of Sn-Sn bonds and the redistribution of Sn atoms in partial density of states (PDOS).
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