Resolving the discrepancy between MOKE measurements at 1550-nm wavelength on Kagome Metal CsV3Sb5

Wang, Jingyuan; Farhang, Camron; Ortiz, Brenden R.; Wilson, Stephen D.; Xia, Jianghai

doi:10.48550/arxiv.2301.08853

2023

DOI: 10.48550/arxiv.2301.08853

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Resolving the discrepancy between MOKE measurements at 1550-nm wavelength on Kagome Metal CsV3Sb5

Jingyuan Wang¹,

Camron Farhang²,

Brenden R. Ortiz³

et al.

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“…Beyond this, an impressive set of experiments has demonstrated that an additional phenomenon is happening in this material, often associated with an onset temperature of T ′ ≈ 20 − 50 K , yet the nature and physical influences are under heavy debate, fuelled by openly contradictory experimental results. These experiments include signatures of time-reversal symmetry (TRS) breaking [27][28][29][30][31] and absence thereof 32,33 ; electronic nematicity [34][35][36][37][38] and absence thereof 39,40 ; and tuneable chirality [41][42][43] and absence thereof 44 .…”

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confidence: 99%

Correlated order at the tipping point in the kagome metal CsV3Sb5

Guo,

Wagner,

Putzke

et al. 2024

Nat. Phys.

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Spontaneously broken symmetries are at the heart of many phenomena of quantum matter and physics more generally. However, determining the exact symmetries that are broken can be challenging due to imperfections such as strain, in particular when multiple electronic orders are competing. This is exemplified by charge order in some kagome systems, where evidence of nematicity and flux order from orbital currents remains inconclusive due to contradictory measurements. Here we clarify this controversy by fabricating highly symmetric samples of a member of this family, CsV3Sb5, and measuring their transport properties. We find that a measurable anisotropy is absent at any temperature in the unperturbed material. However, a pronounced in-plane transport anisotropy appears when either weak magnetic fields or strains are present. A symmetry analysis indicates that a perpendicular magnetic field can indeed lead to in-plane anisotropy by inducing a flux order coexisting with more conventional bond order. Our results provide a unifying picture for the controversial charge order in kagome metals and highlight the need for materials control at the microscopic scale in the identification of broken symmetries.

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confidence: 99%

Correlated order at the tipping point in the kagome metal CsV3Sb5

Guo,

Wagner,

Putzke

et al. 2024

Nat. Phys.

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Unconventional specular optical rotation in the charge ordered state of Kagome metal CsV3Sb5

Farhang,

Wang,

Ortiz

et al. 2023

Nat Commun

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Kagome metals AV3Sb5 (A = K, Cs, Rb) provide a rich platform for intertwined orders, where evidence for time-reversal symmetry breaking, likely due to the long-sought loop currents, has emerged in STM and muon spin relaxation experiments. An isotropic component in the spontaneous optical rotation has also been reported and was interpreted as the magneto-optic Kerr effect. Intriguingly, the observed rotations differ by five orders of magnitude between different wavelengths and samples, suggesting more intricate physics. Here we report optical rotation and polar Kerr measurements in CsV3Sb5 crystals at the same wavelength. We observe large isotropic components of 1 milliradian in the optical rotation that do not respond to applied magnetic fields, while the spontaneous Kerr signal is less than 20 nanoradians. Our results prove unambiguously that the reported isotropic rotation is not from time-reversal symmetry breaking but represents the long-sought specular optical rotation and indicates a new intertwined order.

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Resolving the discrepancy between MOKE measurements at 1550-nm wavelength on Kagome Metal CsV3Sb5

Cited by 2 publications

References 0 publications

Correlated order at the tipping point in the kagome metal CsV3Sb5

Correlated order at the tipping point in the kagome metal CsV3Sb5

Unconventional specular optical rotation in the charge ordered state of Kagome metal CsV3Sb5

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