Theory of nematic charge orders in kagome metals

Grandi, Francesco; Consiglio, Armando; Sentef, Michael A.; Thomale, Ronny; Kennes, Dante M.

doi:10.1103/physrevb.107.155131

Cited by 21 publications

(6 citation statements)

References 100 publications

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“…Drastic magnetic-field-induced chiral current order was also reported theoretically 52 which lines up with our high field μ SR results. Unconventional charge order and orbital current order has also been proposed for ScV 6 Sn 6 53 , 54 based on Ginzburg-Landau and mean-field analysis. According to the theoretical modeling, there is very small net flux and thus the small net magnetic moment in the unit cell of the order.…”

Section: Resultsmentioning

confidence: 99%

Hidden magnetism uncovered in a charge ordered bilayer kagome material ScV6Sn6

Guguchia,

Gawryluk,

Shin

et al. 2023

Nat Commun

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Charge ordered kagome lattices have been demonstrated to be intriguing platforms for studying the intertwining of topology, correlation, and magnetism. The recently discovered charge ordered kagome material ScV6Sn6 does not feature a magnetic groundstate or excitations, thus it is often regarded as a conventional paramagnet. Here, using advanced muon-spin rotation spectroscopy, we uncover an unexpected hidden magnetism of the charge order. We observe an enhancement of the internal field width sensed by the muon ensemble, which takes place within the charge ordered state. More importantly, the muon spin relaxation rate below the charge ordering temperature is substantially enhanced by applying an external magnetic field. Taken together with the hidden magnetism found in AV3Sb5 (A = K, Rb, Cs) and FeGe kagome systems, our results suggest ubiqitous time-reversal symmetry-breaking in charge ordered kagome lattices.

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Section: Resultsmentioning

confidence: 99%

Hidden magnetism uncovered in a charge ordered bilayer kagome material ScV6Sn6

Guguchia,

Gawryluk,

Shin

et al. 2023

Nat Commun

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“…To understand the cLC+BO coexisting states in Fig. 4 f, the Ginzburg-Landau (GL) free energy analysis is very useful 10 , 30 , 31 . For example, the third-order GL term is F (3) = b 1 ϕ 1 ϕ 2 ϕ 3 + b 2 ( ϕ 1 η 2 η 3 + η 1 ϕ 2 η 3 + η 1 η 2 ϕ 3 ), where the coefficients satisfy the relation b 1 ~ − b 2 , and ( ϕ 1 , ϕ 2 , ϕ 3 ) [( η 1 , η 2 , η 3 )] is the magnitude of the BO [cLC] parameter at q = q 1 , q 2 , q 3 .…”

Section: Resultsmentioning

confidence: 99%

“…The GL free energy analysis was performed in ref. 31 . Recently, very weak but definite signal of the nematic electronic order has been observed in Ti-based kagome metal CsTi 3 Bi 5 82 , 83 .…”

Section: Resultsmentioning

confidence: 99%

“…To understand the rich quantum phases in kagome metals, lots of theoretical studies have been performed 6 – 12 , 29 – 31 . Each BO and cLC order is explained by introducing various off-site interactions in the mean-field approximation (MFA) 9 , 29 , 32 , 33 , while a fine-tuning of off-site interactions is necessary to explain the cascade of phase transitions.…”

Section: Introductionmentioning

confidence: 99%

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Charge-loop current order and Z3 nematicity mediated by bond order fluctuations in kagome metals

Tazai,

Yamakawa,

Kontani

2023

Nat Commun

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Recent experiments on geometrically frustrated kagome metal AV3Sb5 (A = K, Rb, Cs) have revealed the emergence of the charge loop current (cLC) order near the bond order (BO) phase. However, the origin of the cLC and its interplay with other phases have been uncovered. Here, we propose a novel mechanism of the cLC state, by focusing on the BO phase common in kagome metals. The BO fluctuations in kagome metals, which emerges due to the Coulomb interaction and the electron-phonon coupling, mediate the odd-parity particle-hole condensation that gives rise to the topological current order. Furthermore, the predicted cLC+BO phase gives rise to the Z3-nematic state in addition to the giant anomalous Hall effect. The present theory predicts the close relationship between the cLC, the BO, and the nematicity, which is significant to understand the cascade of quantum electron states in kagome metals. The present scenario provides a natural understanding.

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“…35 states that there is no evidence of static magnetic order but suggests that time reversal symmetry might still be broken. Moreover, orbital current order has also been predicted to occur in ScV 6 Sn 6 62 . LuV 6 Sn 6 does not have the CDW, and its ρ AHE yz (µ 0 H) does not show this two-slope behavior.…”

Section: Anomalous Hall-like Behaviormentioning

confidence: 98%

Universal sublinear resistivity in vanadium kagome materials hosting charge density waves

Mozaffari

Mandrus

Meier

et al. 2023

Preprint

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The recent discovery of a charge density (CDW) state in ScV6Sn6 at TCDW = 91 K offers new opportunities to understand the origins of electronic instabilities in topological kagome systems. By comparing to the isostructural non-CDW compound LuV6Sn6, we unravel interesting electrical transport properties in ScV6Sn6, above and below the charge ordering temperature. We observed that by applying a magnetic field along the a axis, the temperature behavior of the longitudinal resistivity in ScV6Sn6 changes from metal-like to insulator-like above the CDW transition. We show that in the charge ordered state ScV6Sn6 follows the Fermi liquid behavior while above that, it transforms into a non-Fermi liquid phase in which the resistivity varies sublinearly over a broad temperature range. The sublinear resistivity, which scales by T3/5 is a common feature among other vanadium-containing kagome compounds exhibiting CDW states such as KV3Sb5, RbV3Sb5, and CsV3Sb5. By contrast, the non-Fermi liquid behavior does not occur in LuV6Sn6. We explain the T3/5 universal scaling behavior from the Coulomb scattering between Dirac electrons and Van Hove singularities; common features in the electronic structure of kagome materials. Finally, we show anomalous Hall-like behavior in ScV6Sn6 below TCDW, which is absent in the Lu compound. Comparing the transport properties of ScV6Sn6 and LuV6Sn6 is valuable to highlight the impacts of the unusual CDW in the Sc compound.

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Theory of nematic charge orders in kagome metals

Cited by 21 publications

References 100 publications

Hidden magnetism uncovered in a charge ordered bilayer kagome material ScV6Sn6

Hidden magnetism uncovered in a charge ordered bilayer kagome material ScV6Sn6

Charge-loop current order and Z3 nematicity mediated by bond order fluctuations in kagome metals

Universal sublinear resistivity in vanadium kagome materials hosting charge density waves

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