Anisotropic proximity-induced superconductivity and edge supercurrent in Kagome metal, K1-xV3Sb5

Wang, Yaojia; Yang, Shuo-Ying; Sivakumar, Pranava K.; Ortiz, Brenden R.; Teicher, Samuel M. L.; Srivastava, Abhay K.; Garg, Chirag; Liu, Defa; Parkin, Stuart S. P.; Toberer, Eric S.; McQueen, Tyrel M.; Wilson, Stephen D.; Ali, Mazhar N.

doi:10.48550/arxiv.2012.05898

Cited by 36 publications

(41 citation statements)

References 51 publications

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“…The transport experiments confirm the emergence of nontrivial band topology [26]. This opens a way for envisioning the new quantum devices, based on the topological properties of AV 3 Sb 5 like, e.g., Josephson junctions with extremely long coupling (of at least 6 µm in the case of KV 3 Sb 5 [27]).…”

Section: Introductionsupporting

confidence: 61%

Dynamical Study of the Origin of the Charge Density Wave in $A$V$_{3}$Sb$_{5}$ ($A=$K, Rb, Cs) Compounds

Ptok,

Kobiałka,

Sternik

et al. 2021

Preprint

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Section: Introductionsupporting

confidence: 61%

Dynamical Study of the Origin of the Charge Density Wave in $A$V$_{3}$Sb$_{5}$ ($A=$K, Rb, Cs) Compounds

Ptok,

Kobiałka,

Sternik

et al. 2021

Preprint

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“…The kagome metals AV 3 Sb 5 (A = K, Rb, Cs) [1-4] have drawn significant interest recently, with focus on (1) superconductivity with topological surfaces states [2], which raises the prospects of realizing topological superconductivity and Majorana zero modes [5,6]; (2) a large anomalous Hall effect in the absence of local moments [7-9], which possibly results from a charge order that breaks time-reversal symmetry [10,11]; (3) nature of the superconducting pairing, with evidence for nodeless superconducting gaps [12-14], as well as indications for nematic superconductivity [15]; and (4) sensitivity of superconductivity and charge order to pressure-tuning [16][17][18][19][20][21][22][23], likely related to the presence of competing instabilities on the kagome lattice [24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Evolution of superconductivity and charge order in pressurized RbV$_3$Sb$_5$

Du,

Luo,

et al. 2021

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The kagome metals AV3Sb5 (A = K, Rb, Cs) under ambient pressure exhibit an unusual charge order, from which superconductivity emerges. In this work, by applying hydrostatic pressure using a liquid pressure medium and carrying out electrical resistance measurements for RbV3Sb5, we find the charge order becomes suppressed under a modest pressure pc (1.4 < pc < 1.6 GPa), while the superconducting transition temperature Tc is maximized. Tc is then gradually weakened with further increase of pressure, before exhibiting another maxima around 22.8 GPa, signifying the presence of a second superconducting dome. Distinct normal state resistance anomalies are found to be associated with the second superconducting dome, similar to KV3Sb5. Our findings point to qualitatively similar temperature-pressure phase diagrams in KV3Sb5 and RbV3Sb5, suggesting a link between the second superconducting dome and the high-pressure resistance anomalies in the AV3Sb5 series. I. INTRODUCTIONThe kagome metals AV 3 Sb 5 (A = K, Rb, Cs) [1-4] have drawn significant interest recently, with focus on (1) superconductivity with topological surfaces states [2], which raises the prospects of realizing topological superconductivity and Majorana zero modes [5,6]; (2) a large anomalous Hall effect in the absence of local moments [7-9], which possibly results from a charge order that breaks time-reversal symmetry [10,11]; (3) nature of the superconducting pairing, with evidence for nodeless superconducting gaps [12-14], as well as indications for nematic superconductivity [15]; and (4) sensitivity of superconductivity and charge order to pressure-tuning [16][17][18][19][20][21][22][23], likely related to the presence of competing instabilities on the kagome lattice [24][25][26][27][28].With the application of pressure, the charge order becomes quickly suppressed and superconductivity is enhanced, forming a superconducting dome with maximal T c near the pressure at which charge order disappears [16][17][18][19][20][21][22]. While this superconducting dome can be understood to result from the competition between superconductivity and charge order, a second superconducting dome is found in AV 3 Sb 5 at higher pressures [16,[19][20][21][22], whose origin remains unclear. Factors that may be relevant for formation of the second superconducting dome include a pressure-induced Lifshitz transition [20], magnetism suppressing superconductivity in the region between the two superconducting domes [29], reconstruction of the Sb bands due to the formation of interlayer Sb-Sb bonds [30], and a distinct highpressure phase revealed through resistivity anomalies [19]. While two-dome superconductivity is found in all AV 3 Sb 5 materials via resistivity measurements [22], studies of the corresponding normal state from which superconductivity emerges has been limited [19,20]. In particular, it remains unclear whether resistivity anomalies associated with a high-pressure phase in KV 3 Sb 5 [19] is also present in RbV 3 Sb 5 and CsV 3 Sb 5 .In addition, single crystal diffra...

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“…In kagomé lattices, unconventional superconductivity can emerge by nesting-driven interactions whereupon scattering occurs between saddle points of the band at the M (TRIM) points in the Brillouin zone. Indeed, in Josephson junctions formed with K 1−x V 3 Sb 5 [7], measurements of the magnetoresistance and of the current versus phase provide possible evidence of spin-triplet superconductivity and localized conducting channels from the topological edge states. A stronger form of evidence for unconventional superconductivity in these compounds originates from intriguing high-pressure studies up to 100 GPa [3,[8][9][10][11][12][13][14].…”

Section: Synthesis and Characterizationmentioning

confidence: 99%

Electronic properties of correlated kagomé metals AV$_3$Sb$_5$(A = K, Rb, Cs): A perspective

Nguyen,

2021

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Following the discovery of a new family of kagomé prototypical materials with structure AV3Sb5 (A = K, Rb, Cs), there has been heightened interest in studying correlation-driven electronic phenomena in these kagomé lattice systems. The study of these materials has gone beyond magnetotransport measurements to reveal exciting features such as Dirac bands, anomalous Hall effect, bulk superconductivity with Tc ∼ 0.9 K-2.5 K, and the observation of charge density wave instabilities which suggests 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 to connect them with the concepts of topological physics and strongly-correlated electron systems.

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Anisotropic proximity-induced superconductivity and edge supercurrent in Kagome metal, K1-xV3Sb5

Cited by 36 publications

References 51 publications

Dynamical Study of the Origin of the Charge Density Wave in $A$V$_{3}$Sb$_{5}$ ($A=$K, Rb, Cs) Compounds

Dynamical Study of the Origin of the Charge Density Wave in $A$V$_{3}$Sb$_{5}$ ($A=$K, Rb, Cs) Compounds

Evolution of superconductivity and charge order in pressurized RbV$_3$Sb$_5$

Electronic properties of correlated kagomé metals AV$_3$Sb$_5$(A = K, Rb, Cs): A perspective

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