Charge Density Wave Order and Fluctuations above T CDW and below Superconducting Tc in the Kagome Metal CsV3Sb5
Chen Q, Chen D, Schnelle W, Felser C, Gaulin BD (2022)
Publication Type: Journal article
Publication year: 2022
Journal
Book Volume: 129
Article Number: 056401
Journal Issue: 5
DOI: 10.1103/PhysRevLett.129.056401
Abstract
The phase diagram of the kagome metal family AV3Sb5 (A=K, Rb, Cs) features both superconductivity 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 ∼2 K, below the onset of its superconductivity at Tc∼2.9 K. Order parameter measurements of the 2×2×2 CDW structure show an unusual and extended linear temperature dependence onsetting at T∗∼160 K, much higher than the susceptibility anomaly associated with CDW order at TCDW=94 K. This implies strong CDW fluctuations exist to ∼1.7×TCDW. The CDW order parameter is observed to be constant from T=16 to 2 K, implying that the CDW and superconducting order coexist below Tc, and, at ambient pressure, any possible competition between the two order parameters is manifested at temperatures well below Tc, if at all. Anomalies in the temperature dependence in the lattice parameters coincide with TCDW for c(T) and with T∗ for a(T).
Involved external institutions
McMaster University
Canada (CA)
Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS) / Max Planck Institute for Chemical Physics of Solids
Germany (DE)
Canada (CA)
Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS) / Max Planck Institute for Chemical Physics of Solids
Germany (DE)
How to cite
APA:
Chen, Q., Chen, D., Schnelle, W., Felser, C., & Gaulin, B.D. (2022). Charge Density Wave Order and Fluctuations above T CDW and below Superconducting Tc in the Kagome Metal CsV3Sb5. Physical Review Letters, 129(5). https://doi.org/10.1103/PhysRevLett.129.056401
MLA:
Chen, Q., et al. "Charge Density Wave Order and Fluctuations above T CDW and below Superconducting Tc in the Kagome Metal CsV3Sb5." Physical Review Letters 129.5 (2022).
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