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

Xiaoxiao Zhang; Jun Hou; Wei Xia; Zhian Xu; Pengtao Yang; Anqi Wang; Ziyi Liu; Jie Shen; Hua Zhang; Xiaoli Dong; Yoshiya Uwatoko; Jianping Sun; Bosen Wang; Yanfeng Guo; Jinguang Cheng

doi:10.3390/ma15207372

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

Materials (Basel). 2022 Oct 21;15(20):7372. doi: 10.3390/ma15207372.

Authors

Xiaoxiao Zhang^{1

2}, Jun Hou^{1

2}, Wei Xia^{3

4}, Zhian Xu³, Pengtao Yang¹, Anqi Wang^{1

2}, Ziyi Liu¹, Jie Shen¹, Hua Zhang¹, Xiaoli Dong^{1

2

5}, Yoshiya Uwatoko⁶, Jianping Sun^{1

2}, Bosen Wang^{1

2}, Yanfeng Guo^{3

4}, Jinguang Cheng^{1

2}

Affiliations

¹ Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
² School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China.
³ School of Physical Science and Technology, Shanghai Tech University, Shanghai 201210, China.
⁴ ShanghaiTech Laboratory for Topological Physics, Shanghai Tech University, Shanghai 201210, China.
⁵ Songshan Lake Materials Laboratory, Dongguan 523808, China.
⁶ Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Chiba, Japan.

Abstract

RV₆Sn₆ (R = Sc, Y, or rare earth) is a new family of kagome metals that have a similar vanadium structural motif as AV₃Sb₅ (A = K, Rb, Cs) compounds. Unlike AV₃Sb₅, ScV₆Sn₆ is the only compound among the series of RV₆Sn₆ that 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 ScV₆Sn₆ single crystal to track the evolutions of the CDW transition and to explore possible SC. In contrast to AV₃Sb₅ compounds, the CDW order of ScV₆Sn₆ can 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 ScV₆Sn₆ in comparison with the well-studied AV₃Sb₅.

Keywords: ScV6Sn6; charge density wave; high pressure.

Grants and funding

This research was funded by National Key R&D Program of China (2018YFA0305700, 2021YFA1400200), Beijing Natural Science Foundation (Z190008), National Natural Science Foundation of China (12025408, 11874400, 11834016, 11921004, 11904391, 12174424, 92065201), the Strategic Priority Research Program and Key Research Program of Frontier Sciences of CAS (XDB25000000; QYZDB-SSW-SLH013), the CAS Interdisciplinary Innovation Team (JCTD-201-01), K.C. Wong Education Foundation (GJTD-2020-01), the Users with Excellence Program of Hefei Science Center CAS (2021HSC-UE008), and Youth Promotion Association of CAS (2018010). Y.U. acknowledges the support from JSPS KAKENHI (JP19H00648).