Charge-density-wave-driven electronic nematicity in a kagome superconductor

Nie, L. P.; Sun, Kuanglv; Ma, Wanru; Song, D. W.; Zheng, Lilin; Liang, Zuowei; Wu, Ping; Yu, Fangwei; Li, Jian; Shan, Mengtian; Zhao, Dan; Li, Shunjiao; Kang, Bei-Sheng; Wu, Zhimian; Zhou, Yu; Li, Kai; Xiang, Ziji; Ying, Jianjun; Wang, Z. F.; Wu, Tao; Chen, Xian Hui

doi:10.1038/s41586-022-04493-8

Cited by 296 publications

(194 citation statements)

References 47 publications

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“…Therefore, a direct measurement of the TRS-breaking order parameter at zero-field is urgently needed. Another major debate in the community is whether the system has a six-fold or two-fold rotational symmetry in the CDW phase [20,30,[52][53][54][55][56], and at what temperature the six-fold symmetry breaks. Almost all of the experiments that claimed the two-fold symmetry were performed at temperature much below the CDW transition [20,53,56,57].…”

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confidence: 99%

“…Another major debate in the community is whether the system has a six-fold or two-fold rotational symmetry in the CDW phase [20,30,[52][53][54][55][56], and at what temperature the six-fold symmetry breaks. Almost all of the experiments that claimed the two-fold symmetry were performed at temperature much below the CDW transition [20,53,56,57]. Therefore, whether the two-fold symmetry is directly related to the CDW has not been clear.…”

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confidence: 99%

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Universal three-state nematicity and magneto-optical Kerr effect in the charge density waves in AV$_3$Sb$_5$ (A=Cs, Rb, K)

Xu¹,

Ni²,

Liu³

et al. 2022

Preprint

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confidence: 99%

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confidence: 99%

Universal three-state nematicity and magneto-optical Kerr effect in the charge density waves in AV$_3$Sb$_5$ (A=Cs, Rb, K)

Xu¹,

Ni²,

Liu³

et al. 2022

Preprint

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“…51 Similarly, NMR/NQR experiments point to the Star-of-David CDW at high temperatures, followed by an additional charge modulation below ∼ 40 K. 50 Breaking of the sixfold symmetry of the CDW state was reported experimentally for CsV 3 Sb 5 . 19,52,53 More broadly, the pressuredependent µSR data on the RbV 3 Sb 5 compound also indicates two CDW transitions. 27 Our previous low-temperature, pressure-dependent µSR data on CsV 3 Sb 5 revealed a strong change in the superfluid density within the CDW phase as pressure was varied.…”

Section: Resultsmentioning

confidence: 88%

Charge order breaks time-reversal symmetry in CsV$_3$Sb$_5$

Khasanov,

Das,

Gupta

et al. 2022

Preprint

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The recently discovered vanadium-based kagome metals AV3Sb5 (A = K, Rb, Cs) exhibit superconductivity at low-temperatures and charge density wave (CDW) order at high-temperatures. A prominent feature of the charge ordered state in this family is that it breaks time-reversal symmetry (TRSB), which is connected to the underlying topological nature of the band structure. In this work, a powerful combination of zero-field and high-field muon-spin rotation/relaxation is used to study the signatures of TRSB of the charge order in CsV3Sb5, as well as its anisotropic character. By tracking the temperature evolution of the in-plane and out-of-plane components of the muonspin polarization, an enhancement of the internal field width sensed by the muon-spin ensemble was observed below TTRSB = TCDW 95 K. Additional increase of the internal field width, accompanied by a change of the local field direction at the muon site from the ab-plane to the c-axis, was detected below T * 30 K. Remarkably, this two-step feature becomes well pronounced when a magnetic field of 8 T is applied along the crystallographic c−axis, thus indicating a field-induced enhancement of the electronic response at the CDW transition. These results point to a TRSB in CsV3Sb5 by charge order with an onset of 95 K, followed by an enhanced electronic response below 30 K. The observed two-step transition is discussed within the framework of different charge-order instabilities, which, in accordance with density functional theory calculations, are nearly degenerate in energy.

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“…Kagome lattice systems have been proposed to host rich physics, such as quantum spin liquid and unconventional superconductivity in systems with strong electron correlations [1][2][3][4][5] . Recently, the electronic flat band [6][7][8][9][10][11][12][13][14][15] and Dirac cones [9][10][11][16][17][18][19][20][21][22] were also observed and caused intense research interests in several metallic kagome materials, where the electron correlations appear to be weak. In the Kagome lattice, the flat band arises from phase destruction of electron wave functions in the corner shared triangles, so that one electron band is localized in the hexagons 23,24 .…”

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confidence: 99%

Pressure-induced superconductivity in flat-band Kagome compounds Pd$_3$P$_2$(S$_{1-x}$Se$_x$)$_8$

Li,

Han,

Yan

et al. 2022

Preprint

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We performed high-pressure transport studies on the flat-band Kagome compounds, Pd3P2(S1−xSex)8 (x = 0, 0.25), with a diamond anvil cell. For both compounds, the resistivity exhibits an insulating behavior with pressure up to 17 GPa. With pressure above 20 GPa, a metallic behavior is observed at high temperatures in Pd3P2S8, and superconductivity emerges at low temperatures. The onset temperature of superconducting transition TC rises monotonically from 2 K to 5 K and does not saturate with pressure up to 43 GPa. For the Se-doped compound Pd3P2(S0.75Se0.25)8, the TC is about 1.5 K higher than that of the undoped one over the whole pressure range, and reaches 6.5 K at 43 GPa. The upper critical field with field applied along the c axis at typical pressures is about 50% of the Pauli limit, suggests a 3D superconductivity. The Hall coefficient is low and exhibits a peaked behavior at about 40 K, which suggests a multi-band electronic structure.

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Charge-density-wave-driven electronic nematicity in a kagome superconductor

Cited by 296 publications

References 47 publications

Universal three-state nematicity and magneto-optical Kerr effect in the charge density waves in AV$_3$Sb$_5$ (A=Cs, Rb, K)

Universal three-state nematicity and magneto-optical Kerr effect in the charge density waves in AV$_3$Sb$_5$ (A=Cs, Rb, K)

Charge order breaks time-reversal symmetry in CsV$_3$Sb$_5$

Pressure-induced superconductivity in flat-band Kagome compounds Pd$_3$P$_2$(S$_{1-x}$Se$_x$)$_8$

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