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  Charge Density Wave Order and Fluctuations above TCDW and below Superconducting Tc in the Kagome Metal CsV3Sb5

Chen, Q., Chen, D., Schnelle, W., Felser, C., & Gaulin, B. D. (2022). Charge Density Wave Order and Fluctuations above TCDW and below Superconducting Tc in the Kagome Metal CsV3Sb5. Physical Review Letters, 129(5): 056401, pp. 1-6. doi:10.1103/PhysRevLett.129.056401.

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 Creators:
Chen, Q.1, Author
Chen, D.2, Author           
Schnelle, W.3, Author           
Felser, C.4, Author           
Gaulin, B. D.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
3Walter Schnelle, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863441              
4Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              

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 Abstract: The phase diagram of the kagome metal family AV(3)Sb(5) (A = K, Rb, Cs) features both super-conductivity and charge density wave (CDW) instabilities, which have generated tremendous recent attention. Nonetheless, significant questions remain. In particular, the temperature evolution and demise of the CDW state has not been extensively studied, and little is known about the coexistence of the CDW with superconductivity at low temperatures. We report an x-ray scattering study of CsV3Sb5 over a broad range of temperatures from 300 to similar to 2 K, below the onset of its superconductivity at T-c similar to 2.9 K. Order parameter measurements of the 2 x 2 x 2 CDW structure show an unusual and extended linear temperature dependence onsetting at T* similar to 160 K, much higher than the susceptibility anomaly associated with CDW order at T-CDW = 94 K. This implies strong CDW fluctuations exist to similar to 1.7 x T-CDW. The CDW order parameter is observed to be constant from T = 16 to 2 K, implying that the CDW and superconducting order coexist below T-c, and, at ambient pressure, any possible competition between the two order parameters is manifested at temperatures well below T-c, if at all. Anomalies in the temperature dependence in the lattice parameters coincide with T(CDW )for c(T) and with T* for a(T).

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Language(s): eng - English
 Dates: 2022-07-292022-07-29
 Publication Status: Published in print
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Title: Physical Review Letters
  Abbreviation : Phys. Rev. Lett.
Source Genre: Journal
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Publ. Info: Woodbury, N.Y. : American Physical Society
Pages: - Volume / Issue: 129 (5) Sequence Number: 056401 Start / End Page: 1 - 6 Identifier: ISSN: 0031-9007
CoNE: https://pure.mpg.de/cone/journals/resource/954925433406_1