Observation of anomalous amplitude modes in the kagome metal CsV$_3$Sb$_5$

Liu, Gan; Ma, Xinran; He, Kuanyu; Li, Qing; Tan, Hengxin; Liu, Yizhou; Xu, Jie; Tang, Wenna; Watanabe, Kenji; Taniguchi, Takashi; Gao, Libo; Dai, Yaomin; Wen, Hai-Hu; Yan, Binghai; Xi, Xiaoxiang

doi:10.48550/arxiv.2201.05330

Cited by 4 publications

(3 citation statements)

References 59 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, recent Raman spectroscopy reported the anomalous amplitude modes in the absence of soft phonons, indicating that the CDW exhibits the character of strong electron-phonon coupling. [61] In the phonon spectroscopy, the structural change shows a predominately first-order phase transition. No CDW amplitude mode is identified in the ordered phase.…”

Section: The 2 × 2 Superlattice Charge Orders In Kagome Latticementioning

confidence: 99%

Superconductivity and unconventional density waves in vanadium-based kagome materials AV₃Sb₅

Chen

et al. 2022

Chinese Phys. B

View full text Add to dashboard Cite

Recently, the discovery of vanadium-based kagome metal AV3Sb5 (A = K, Rb, Cs) has attracted great interest in the field of superconductivity due to the coexistence of superconductivity, non-trivial surface state and multiple density waves. In this topic review, we present recent works of superconductivity and unconventional density waves in vanadium-based kagome materials AV3Sb5. We start with the unconventional charge density waves, which are thought to correlate to the timereversal symmetry-breaking orders and the unconventional anomalous Hall effects in AV3Sb5. Then we discuss the superconductivity and the topological band structure. Next, we review the competition between the superconductivity and charge density waves at different condition of pressure, chemical doping, thickness, and strains. Finally, the experimental evidences of pseudogap pair density wave are discussed.

show abstract

Section: The 2 × 2 Superlattice Charge Orders In Kagome Latticementioning

confidence: 99%

Superconductivity and unconventional density waves in vanadium-based kagome materials AV₃Sb₅

Chen

et al. 2022

Chinese Phys. B

View full text Add to dashboard Cite

show abstract

“…Polarized Raman spectroscopy of CsV 3 Sb 5 uncovers a phonon anomaly below ( 50 K) and at the CDW transition temperature ( 94 K), which is attributed to secondary electronic instabilities in the CDW state with s-wave symmetry. 62 Thickness-dependent Raman spectroscopy measurements on CsV 3 Sb 5 63 demonstrate enhanced changes in phonon properties as the thickness decreases, which highlights large electron-phonon coupling. More recently, studies from temperature-dependent x-ray diffraction, 64,65 polarization-resolved electronic Raman spectroscopy, 66 and ARPES 67 reveal the existence of a 2 Â 2 Â 4 superstructure in CsV 3 Sb 5 at higher temperatures in contrast to the 2 Â 2 Â 2 superstructure at lower temperatures.…”

Section: Journal Of Applied Physicsmentioning

confidence: 97%

Electronic properties of correlated kagomé metals AV3Sb5 (A = K, Rb, and Cs): A perspective

Nguyễn

2022

Journal of Applied Physics

View full text Add to dashboard Cite

Following the discovery of a new family of kagomé prototypical materials with structure AV 3 Sb 5 (A ¼ K, Rb, and Cs), there has been a heightened interest in studying the correlation-driven electronic phenomena in these kagomé lattice systems. The study of these materials has gone beyond magneto-transport measurements to reveal exciting features such as Dirac bands, anomalous Hall effect, bulk superconductivity with T c 0:9À2:5 K, and the observation of charge density wave instabilities, suggesting an intertwining of topological physics and new quantum orders. Moreover, very recent works on numerous types of experiments have appeared further examining the unconventional superconductivity and the exotic electronic states found within these kagomé materials. Theories on the strong interactions that play a role in these systems have been proposed to shed light on the nature of these topological charge density waves. In this brief review, we summarize these recent experimental findings and theoretical proposals and envision the materials as new platforms to study the interplay between topological physics and strongly correlated electronic systems.

show abstract

“…Focusing on the case of CsV 3 Sb 5 , several recent studies have investigated its electronic ordering instability, a CDW that is associated with a magnetic susceptibility anomaly at T CDW = 94 K [14][15][16][17]. Somewhat surprisingly the CDW order in CsV 3 Sb 5 is three-dimensional [3,5,8,[18][19][20][21], which means that there are electron correlations not only in the kagome plane (ab-plane), but also between the kagome layers, along the c-axis.…”

mentioning

confidence: 99%

Charge density wave order and fluctuations above T$_{CDW}$ and below superconducting T$_c$ in the kagome metal CsV$_{3}$Sb$_{5}$

Chen,

Schnelle

et al. 2022

Preprint

View full text Add to dashboard Cite

The phase diagram of the kagome metal family AV 3 Sb 5 (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 co-existence of the CDW with superconductivity at low temperatures. We report an x-ray scattering study of CsV 3 Sb 5 over a broad range of temperatures from 300 K 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 K to 2 K, implying that the CDW and superconducting order co-exist 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 ).

show abstract

Observation of anomalous amplitude modes in the kagome metal CsV$_3$Sb$_5$

Cited by 4 publications

References 59 publications

Superconductivity and unconventional density waves in vanadium-based kagome materials AV₃Sb₅

Superconductivity and unconventional density waves in vanadium-based kagome materials AV₃Sb₅

Electronic properties of correlated kagomé metals AV3Sb5 (A = K, Rb, and Cs): A perspective

Charge density wave order and fluctuations above T$_{CDW}$ and below superconducting T$_c$ in the kagome metal CsV$_{3}$Sb$_{5}$

Contact Info

Product

Resources

About

Observation of anomalous amplitude modes in the kagome metal CsV$_3$Sb$_5$

Cited by 4 publications

References 59 publications

Superconductivity and unconventional density waves in vanadium-based kagome materials AV3Sb5

Superconductivity and unconventional density waves in vanadium-based kagome materials AV3Sb5

Electronic properties of correlated kagomé metals AV3Sb5 (A = K, Rb, and Cs): A perspective

Charge density wave order and fluctuations above T$_{CDW}$ and below superconducting T$_c$ in the kagome metal CsV$_{3}$Sb$_{5}$

Contact Info

Product

Resources

About

Superconductivity and unconventional density waves in vanadium-based kagome materials AV₃Sb₅

Superconductivity and unconventional density waves in vanadium-based kagome materials AV₃Sb₅