Observation of Unconventional Charge Density Wave without Acoustic Phonon Anomaly in Kagome Superconductors A V 3 Sb 5 ( A = Rb , Cs)
Year: 2021
Type: article
Abstract: The combination of nontrivial band topology and symmetry-breaking phases gives rise to novel quantum states and phenomena such as topological superconductivity, quantum anomalous Hall effect, and axion electrodynamics.Evidence of intertwined charge density wave (CDW) and superconducting order parameters has recently been observed in a novel kagome material AV 3 Sb 5 (A ¼ K, Rb, Cs) that features a Z 2 topological invariant in the electronic structure.However, the origin of the CDW and its intricate interplay with the topological state has yet to be determined.Here, using hard-x-ray scattering, we demonstrate a three-dimensional CDW with 2 × 2 × 2 superstructure in ðRb; CsÞV 3 Sb 5 .Unexpectedly, we find that the CDW fails to induce acoustic phonon anomalies at the CDW wave vector but yields a novel Raman mode that quickly damps into a broad continuum below the CDW transition temperature.Our observations exclude strong electron-phonon-coupling-driven CDW in AV 3 Sb 5 and support an unconventional CDW that was proposed in the kagome lattice at van Hove filling.
Source: Physical Review X
Authors: Haoxiang Li, T. T. Zhang, T. Yilmaz, Y. Y. Pai, C. E. Marvinney, A. Said, Q. W. Yin, C. S. Gong, Z. J. Tu, E. Vescovo, C. S. Nelson, R. G. Moore, S. Murakami, H. C. Lei, H. N. Lee, B. J. Lawrie, H. Miao
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $4,200
Funders: U.S. Department of Energy, Battelle, Office of the Director of National Intelligence, UT-Battelle, Ministry of Education, Culture, Sports, Science and Technology, National Natural Science Foundation of China, Ministry of Science and Technology of the People's Republic of China, Renmin University of China, Natural Science Foundation of Beijing Municipality, Office of Science, Oak Ridge Institute for Science and Education, Intelligence Community Postdoctoral Research Fellowship Program, Japan Society for the Promotion of Science, Fundamental Research Funds for the Central Universities, Tokodai Institute for Element Strategy, NIH Office of the Director, Basic Energy Sciences, Laboratory Directed Research and Development, Argonne National Laboratory, Oak Ridge National Laboratory, Brookhaven National Laboratory, Division of Materials Sciences and Engineering
Awards: G102163711, G1056833544, G107546177, G1099216713, G1104325616, G1123466569, G1210759672, G1285306620, G1286251239, G1313983767, G1505794299, G1664757510, G1684028103, G171842289, G1847291448, G1868695577, G203625172, G2101401529, G2249550413, G2287611682, G241279073, Frontiers in topological material science, G262962599, G2887060908, G3075337988, G3262563802, G3376599446, G340565428, G3458488415, G357145406, G378482292, G3850097093, G426311843, G4662383146, G4883243624, G4920325777, G4972998915, G498139845, G5106849484, G5387317844, G5417557083, G5419184411, G5535608740, Diagnosing topological phononic materials by first-principle calculations, G5633341255, G5765906131, G5910536577, G5958906545, G6089160183, G6256444366, G671128950, G6733788163, G6848031779, G6918803902, G6965541988, G7368700025, G7463374569, G7583137537, G7690729930, G7859028281, G788322952, G8151357578, G8253527446, G8286507625, G8333907652, G880751848, G969889393, G993149817
OpenAlex ID: W3136589886