Superconductivity modulated by structural phase transitions in pressurized vanadium-based kagome metals

Du, Feng; Li, Rui; Luo, Shuaishuai; Gong, Yubin; Li, Yanchun; Jiang, Shan; Ortiz, Brenden R.; Liu, Yi; Xu, Xiaofeng; Wilson, Stephen D.; Cao, Chao; Song, Yu; Yuan, Huiqiu

doi:10.1103/physrevb.106.024516

Cited by 17 publications

(11 citation statements)

References 46 publications

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“…Recent discoveries of vanadium(V)-based kagome metals, A V 3 Sb 5 ( A = K, Rb, Cs), have attracted considerable research interest, and they have now emerged as an important material platform to study the interplay among non-trivial band topology, CDW, nematic order, and SC [ 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 ]. Prior to the superconducting transition at low temperatures, i.e., T c = 0.93–2.5 K, they undergo a second-order CDW transition at T* = 78, 104 and 94 K for A = K, Rb, and Cs, respectively [ 11 , 14 , 15 , 16 , 17 , 18 , 20 , 21 , 28 ]. The nature of CDW and SC, as well as their interplay, has been the subject of extensive investigations in the last three years, resulting in many intriguing findings pertinent to the kagome lattice geometry, non-trivial band topology, and electron correlations in this system [ 6 , 8 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 24 , 25 , 26 , 28 , 29 , 30 , 31 ,…”

Section: Introductionmentioning

confidence: 99%

“…Prior to the superconducting transition at low temperatures, i.e., T c = 0.93–2.5 K, they undergo a second-order CDW transition at T* = 78, 104 and 94 K for A = K, Rb, and Cs, respectively [ 11 , 14 , 15 , 16 , 17 , 18 , 20 , 21 , 28 ]. The nature of CDW and SC, as well as their interplay, has been the subject of extensive investigations in the last three years, resulting in many intriguing findings pertinent to the kagome lattice geometry, non-trivial band topology, and electron correlations in this system [ 6 , 8 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 24 , 25 , 26 , 28 , 29 , 30 , 31 , 32 ]. Among those studies, the high-pressure approach plays an important role in uncovering the intimate relationship between these intertwined orders [ 12 , 26 , 31 , 32 ].…”

Section: Introductionmentioning

confidence: 99%

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Destabilization of the Charge Density Wave and the Absence of Superconductivity in ScV6Sn6 under High Pressures up to 11 GPa

et al. 2022

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RV6Sn6 (R = Sc, Y, or rare earth) is a new family of kagome metals that have a similar vanadium structural motif as AV3Sb5 (A = K, Rb, Cs) compounds. Unlike AV3Sb5, ScV6Sn6 is the only compound among the series of RV6Sn6 that displays a charge density wave (CDW) order at ambient pressure, yet it shows no superconductivity (SC) at low temperatures. Here, we perform a high-pressure transport study on the ScV6Sn6 single crystal to track the evolutions of the CDW transition and to explore possible SC. In contrast to AV3Sb5 compounds, the CDW order of ScV6Sn6 can be suppressed completely by a pressure of about 2.4 GPa, but no SC is detected down to 40 mK at 2.35 GPa and 1.5 K up to 11 GPa. Moreover, we observed that the resistivity anomaly around the CDW transition undergoes an obvious change at ~2.04 GPa before it vanishes completely. The present work highlights a distinct relationship between CDW and SC in ScV6Sn6 in comparison with the well-studied AV3Sb5.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Destabilization of the Charge Density Wave and the Absence of Superconductivity in ScV6Sn6 under High Pressures up to 11 GPa

et al. 2022

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“…Structural phase transitions are unveiled by XRD, as the function of pressure for three Kagome superconductors, which sheds light on the origin of re‐entrance superconductivity in KV 3 Sb 5 and RbV 3 Sb 5 . [ 34,345 ] While CsV 3 Sb 5 remains in its structure up to 150 GPa, [ 34 ] the structural phase transition from the hexagonal to the monoclinic is observed in KV 3 Sb 5 and RbV 3 Sb 5 at the beginning of the second superconducting dome, [ 345 ] shown in Figure 8g. An additional structural phase transition to the orthorhombic phase is discerned in KV 3 Sb 5 above 20 GPa, concomitant with a rapid suppression of superconductivity.…”

Section: Mechanical Modulationmentioning

confidence: 99%

“…An additional structural phase transition to the orthorhombic phase is discerned in KV 3 Sb 5 above 20 GPa, concomitant with a rapid suppression of superconductivity. [ 345 ] However, despite these structural evidences, the microscopic origin of pressure‐induced evolution in KV 3 Sb 5 and RbV 3 Sb 5 remains elusive.…”

Section: Mechanical Modulationmentioning

confidence: 99%

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Modulations in Superconductors: Probes of Underlying Physics

et al. 2023

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development of various modulations techniques, breakthroughs in quantum materials are achieved, such as the quantum anomalous Hall effect (AHE) in topological insulators, [1][2][3][4] gate-tuned roomtemperature ferromagnetism in 2D van der Waals materials, [5][6][7][8] and emergent magnetic monopoles in artificial spin ice. [9] Especially, as the quantum materials of particular interest with zero dissipation, superconductors have been intensively studied with advanced modulations, aiming to reveal a plethora of emergent phenomena in condensed matter physics, such as superconductor-to-insulator transitions (SIT), [10][11][12] intermediate bosonic metallic state, [13] Bose-Einstein condensation (BEC)-Bardeen-Cooper-Schrieffer (BCS) crossover, [14,15] and intertwined orders, [16][17][18] as well as to develop applications in quantum computing [19][20][21] and ultrasensitive detections. [22][23][24] The superconductivity composes of two ingredients, including the Cooper pairs, each formed by two electrons, and phase coherence among Cooper pairs. [25] Superconductors such as metals and alloys are in the weak-coupling regime, which is well understood by BCS theory. [26,27] However, the later discovered superconductors, including cuprates, iron-based superconductors, and heavy-fermion superconductors, are strongly correlated systems, where a widely accepted microscopic mechanism yet remains absent. Therefore, various modulations have been utilized for the ultimate understanding of these superconductors and routines for room temperature superconductivity. Traditional modulations, such as elemental substitution, annealing, and polarization-induced gating are usually accompanied by some severe problems, including discontinuity, disorders, and limited ranges. Recently, state-of-the-art techniques have been developed with improved convenience, increased capability, and unprecedented dimensionalities, enabling more thorough investigations of unconventional superconductors.As a manifestation, we take some examples discussed in this review in advance. The carrier density can be tuned more conveniently and continuously. The techniques of ionic field-effect transistor (iFET) and electric double-layer transistor (EDLT) surpass conventional methods limited by solid solubility or dielectric breakdown, which enables the more precise phase diagram and detailed scaling analysis at the quantum phaseThe importance of modulations is elevated to an unprecedented level, due to the delicate conditions required to bring out exotic phenomena in quantum materials, such as topological materials, magnetic materials, and superconductors. Recently, state-of-the-art modulation techniques in material science, such as electric-double-layer transistor, piezoelectric-based strain apparatus, angle twisting, and nanofabrication, have been utilized in superconductors. They not only efficiently increase the tuning capability to the broader ranges but also extend the tuning dimensionality to unprecedented degrees of freedom, including quantum fluctuations of...

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Roundabout-like defect as a guide of phase-slip lines in a superconducting thin film at low temperature

Gonzalez-Balaguera,

Aguirre,

Barba-Ortega

2024

emergent mater.

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In this work, we examined the kinematic vortex state in a low-temperature, mesoscopic superconducting thin film in presence of an external applied current $$\varvec{J}$$ J , at zero magnetic field. We analyzed the voltage-current ($$\varvec{V-I}$$ V - I ), resistivity-current ($$\varvec{R-I}$$ R - I ) curves, as well as the vortex-anti-vortex velocity $$\varvec{V_m}$$ V m and the superconducting-electron density (norm of the superconduting order parameter $$\varvec{\psi }$$ ψ ) as an applied current function. Additionally, we have calculated the voltage as a function of characteristic time ($$\varvec{V-t}$$ V - t ). The sample presents a roundabout shaped pinning center fabricated with a lower low-temperature superconducting material, which allows for control over the vortex dynamics within the sample. To study this system, we have solved the generalized time-dependent Ginzburg-Landau equations for a single-condensate system. Our results demonstrate that the kinematic vortices enter the sample through regions where the superconductivity is depleted, revealing an intriguing and novel behavior of the phase-slip lines in the defect. We found that when a higher $$\varvec{J}$$ J is applied and the defect is not centered, the point where the vortex anti-vortex pairs enter the film moves away from the defect and are located in a point tangent to the outer circle of the defect. Besides, our results show a way to control the dynamics of the vortices, critical currents, and points of annihilation or creation of the cinematic vortices by including defects in the sample, important in the design and development of devices applied in industry and engineering.

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Superconductivity modulated by structural phase transitions in pressurized vanadium-based kagome metals

Cited by 17 publications

References 46 publications

Destabilization of the Charge Density Wave and the Absence of Superconductivity in ScV6Sn6 under High Pressures up to 11 GPa

Destabilization of the Charge Density Wave and the Absence of Superconductivity in ScV6Sn6 under High Pressures up to 11 GPa

Modulations in Superconductors: Probes of Underlying Physics

Roundabout-like defect as a guide of phase-slip lines in a superconducting thin film at low temperature

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