Destabilization of the Charge Density Wave and the Absence of Superconductivity in ScV6Sn6 under High Pressures up to 11 GPa

RV6Sn6(R= Sc, Y, or rare earth) is a new family of kagome metals that have a similar vanadium structural motif asAV3Sb5(A= K, Rb, Cs) compounds. UnlikeAV3Sb5, ScV6Sn6is the only compound among the series ofRV6Sn6that displays a charge density wave (CDW) order at ambient pressure, yet it shows no superconductivity (SC) at low temperatures. Here, we perform a high-pressure transport study on the ScV6Sn6single crystal to track the evolutions of the CDW transition and to explore possible SC. In contrast toAV3Sb5compounds, the CDW order of ScV6Sn6can be suppressed completely by a pressure of about 2.4 GPa, but no SC is detected down to 40 mK at 2.35 GPa and 1.5 K up to 11 GPa. Moreover, we observed that the resistivity anomaly around the CDW transition undergoes an obvious change at ~2.04 GPa before it vanishes completely. The present work highlights a distinct relationship between CDW and SC in ScV6Sn6in comparison with the well-studiedAV3Sb5.Keywords:ScV6Sn6;charge density wave;high pressure