Observation of Unconventional Charge Density Wave without Acoustic Phonon Anomaly in Kagome Superconductors AV3Sb5 (A=Rb, Cs)
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 param...
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| creator | Li, Haoxiang Zhang, T T Yilmaz, T Pai, Y Y Marvinney, C E Said, A Yin, Q W Gong, C S Tu, Z J Vescovo, E Nelson, C S Moore, R G Murakami, S Lei, H C Lee, H N Lawrie, B J Miao, H |
| description | 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 materialAV3Sb5(A=K, Rb, Cs) that features aZ2topological 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 with2×2×2superstructure in(Rb,Cs)V3Sb5. 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 inAV3Sb5and support an unconventional CDW that was proposed in the kagome lattice at van Hove filling. |
| doi_str_mv | 10.1103/PhysRevX.11.031050 |
| format | Article |
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Evidence of intertwined charge density wave (CDW) and superconducting order parameters has recently been observed in a novel kagome materialAV3Sb5(A=K, Rb, Cs) that features aZ2topological 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 with2×2×2superstructure in(Rb,Cs)V3Sb5. 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 inAV3Sb5and support an unconventional CDW that was proposed in the kagome lattice at van Hove filling.</description><identifier>EISSN: 2160-3308</identifier><identifier>DOI: 10.1103/PhysRevX.11.031050</identifier><language>eng</language><publisher>College Park: American Physical Society</publisher><subject>Acoustics ; Anomalies ; Broken symmetry ; Cesium ; Charge density waves ; Electrodynamics ; Electronic structure ; Excitation ; First principles ; Kagome lattice ; Mathematical analysis ; Order parameters ; Phonons ; Photoelectric emission ; Quantum Hall effect ; Superconductivity ; Superconductors ; Topology ; Transition temperature ; Wave functions ; X-ray scattering</subject><ispartof>Physical review. X, 2021-09, Vol.11 (3)</ispartof><rights>2021. This work is licensed under https://creativecommons.org/licenses/by/4.0/ (the “License”). 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Our observations exclude strong electron-phonon-coupling-driven CDW inAV3Sb5and support an unconventional CDW that was proposed in the kagome lattice at van Hove filling.</description><subject>Acoustics</subject><subject>Anomalies</subject><subject>Broken symmetry</subject><subject>Cesium</subject><subject>Charge density waves</subject><subject>Electrodynamics</subject><subject>Electronic structure</subject><subject>Excitation</subject><subject>First principles</subject><subject>Kagome lattice</subject><subject>Mathematical analysis</subject><subject>Order parameters</subject><subject>Phonons</subject><subject>Photoelectric emission</subject><subject>Quantum Hall effect</subject><subject>Superconductivity</subject><subject>Superconductors</subject><subject>Topology</subject><subject>Transition temperature</subject><subject>Wave functions</subject><subject>X-ray scattering</subject><issn>2160-3308</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><sourceid>BENPR</sourceid><recordid>eNotj89LwzAcxYMgOOb-AU8BLwp2Js2atAcPpf7Ewcbm1NtI0m_Wji3RJq3s4P9uRd_l8eC9DzyEzigZU0rY9bw6-AV0730aE0ZJQo7QIKacRIyR9ASNvN-SXpzQiRAD9D1THppOhtpZ7AxeWe1sB_Y3yx0uKtlsAN-C9XU44DfZAf6qQ-XagHPtWh9qjeeVs_06t24vdwdcW_wsN24PeNl-QNPzylYH13icv7KlSvBFfrNQV7jwl6fo2Midh9G_D9Hq_u6leIyms4enIp9GmvI4RJKlpVBpqbSJgUwmMjMm0awkpNQmE9JoAcBFnHFJFSgCzDDomxlIJUpesiE6_-N-NO6zBR_WW9c2_UG_jhOe0YyKNGY__zRipA</recordid><startdate>20210903</startdate><enddate>20210903</enddate><creator>Li, Haoxiang</creator><creator>Zhang, T T</creator><creator>Yilmaz, T</creator><creator>Pai, Y Y</creator><creator>Marvinney, C E</creator><creator>Said, A</creator><creator>Yin, Q W</creator><creator>Gong, C S</creator><creator>Tu, Z J</creator><creator>Vescovo, E</creator><creator>Nelson, C S</creator><creator>Moore, R G</creator><creator>Murakami, S</creator><creator>Lei, H C</creator><creator>Lee, H N</creator><creator>Lawrie, B J</creator><creator>Miao, H</creator><general>American Physical Society</general><scope>3V.</scope><scope>7XB</scope><scope>88I</scope><scope>8FE</scope><scope>8FG</scope><scope>8FK</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>COVID</scope><scope>DWQXO</scope><scope>GNUQQ</scope><scope>HCIFZ</scope><scope>L6V</scope><scope>M2P</scope><scope>M7S</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>PTHSS</scope><scope>Q9U</scope></search><sort><creationdate>20210903</creationdate><title>Observation of Unconventional Charge Density Wave without Acoustic Phonon Anomaly in Kagome Superconductors AV3Sb5 (A=Rb, Cs)</title><author>Li, Haoxiang ; 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X</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Li, Haoxiang</au><au>Zhang, T T</au><au>Yilmaz, T</au><au>Pai, Y Y</au><au>Marvinney, C E</au><au>Said, A</au><au>Yin, Q W</au><au>Gong, C S</au><au>Tu, Z J</au><au>Vescovo, E</au><au>Nelson, C S</au><au>Moore, R G</au><au>Murakami, S</au><au>Lei, H C</au><au>Lee, H N</au><au>Lawrie, B J</au><au>Miao, H</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Observation of Unconventional Charge Density Wave without Acoustic Phonon Anomaly in Kagome Superconductors AV3Sb5 (A=Rb, Cs)</atitle><jtitle>Physical review. X</jtitle><date>2021-09-03</date><risdate>2021</risdate><volume>11</volume><issue>3</issue><eissn>2160-3308</eissn><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 materialAV3Sb5(A=K, Rb, Cs) that features aZ2topological 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 with2×2×2superstructure in(Rb,Cs)V3Sb5. 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 inAV3Sb5and support an unconventional CDW that was proposed in the kagome lattice at van Hove filling.</abstract><cop>College Park</cop><pub>American Physical Society</pub><doi>10.1103/PhysRevX.11.031050</doi><oa>free_for_read</oa></addata></record> |
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| subjects | Acoustics Anomalies Broken symmetry Cesium Charge density waves Electrodynamics Electronic structure Excitation First principles Kagome lattice Mathematical analysis Order parameters Phonons Photoelectric emission Quantum Hall effect Superconductivity Superconductors Topology Transition temperature Wave functions X-ray scattering |
| title | Observation of Unconventional Charge Density Wave without Acoustic Phonon Anomaly in Kagome Superconductors AV3Sb5 (A=Rb, Cs) |
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