Journal Article

Two types of charge order with distinct interplay with superconductivity in the kagome material CsV3Sb5

Luetkens, Hubertus, Das, Debarchan, Yin, Qiangwei, Hotz, Fabian, Tu, Zhijun, Gong, Chunsheng, Khasanov, Rustem, Gupta, Ritu, Lei, Hechang, Guguchia, Zurab, Fernandes, Rafael M., Mielke, Charles, Ritz, Ethan T., Birol, Turan

2022

Overview

The kagome metals of the family A V 3 Sb 5 , featuring a unique structural motif, harbor an array of intriguing phenomena such as chiral charge order and superconductivity. CsV 3 Sb 5 is of particular interest because it displays a double superconducting dome in the region of the temperature-pressure phase diagram where charge order is still present. However, the microscopic origin of such an unusual behavior remains an unsolved issue. Here, to address it, we combine high-pressure, low-temperature muon spin relaxation/rotation with first-principles calculations. We observe a pressure-induced threefold enhancement of the superfluid density, which also displays a double-peak feature, similar to the superconducting critical temperature. This leads to three distinct regions in the phase diagram, each of which features distinct slopes of the linear relation between superfluid density and the critical temperature. These results are attributed to a possible evolution of the charge order pattern from the superimposed tri-hexagonal Star-of-David phase at low pressures (within the first dome) to the staggered tri-hexagonal phase at intermediate pressures (between the first and second domes). Our findings suggest a change in the nature of the charge-ordered state across the phase diagram of CsV 3 Sb 5 , with varying degrees of competition with superconductivity. Kagome metals can house a complex interplay of competing phenomenon and there has been significant investigation into how to engineer the resultant properties, as well as understand the underlying physics. Here, the authors investigate the competition between charge density wave order and superconductivity for CsV 3 Sb 5 using a combination of high-pressure and muon spin rotation measurements.

• Publisher: Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
• Subject: 639/301/119/1003 / 639/766/119/995 / Charge density waves / Competition / Displays / Domes / First principles / Fluids / Hexagonal phase / High pressure / Laboratories / Low temperature / Magnetic fields / Muon spin relaxation / Muon spin rotation / Phase diagrams / Physics / Physics and Astronomy / Spectrum analysis / Superconductivity / Superfluidity / Transition temperature / Vortices