Pressure-Induced Dimensional Crossover in a Kagome Superconductor

Yu, Fangwei; Zhu, Xudong; Wen, Xikai; Gui, Zhigang; Li, Zeyu; Han, Yulei; Wu, Tao; Wang, Zhenyu; Xiang, Ziji; Qiao, Zhenhua; Ying, Jianjun; Chen, Xianhui

doi:10.1103/physrevlett.128.077001

Cited by 34 publications

(28 citation statements)

References 36 publications

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“…8(b), ∆ sc closes at T c ≈ 13.0, 7.9, and 5.5 K at 3, 6, and 9 GPa, respectively. In view of the Allen-Dyne formula [61] where the decrease (increase) in λ (ω log ) contributes to lower (raise) T c , we can say that λ is more likely responsible for the observed [3,4,[33][34][35] lowering of T c with increasing pressure. Here, the presently predicted T c values between 3 and 9 GPa are reduced as large as ∼7.5 K, in good agreement with the experimental data [3,4,[33][34][35] showing a decrease of ∼6 K between 2 and 9 GPa.…”

Section: B Superconductivity Of Compressed Csv 3 Sb 5 Around Qcpmentioning

confidence: 92%

“…The intimate relationship between the intertwined CDW order and SC in AV 3 Sb 5 has been further explored by applying pressure [3,4,[30][31][32][33][34][35]. The observed pressure−temperature (P − T ) phase diagram displays a quantum phase transition (QPT) between the CDW and pristine phases at zero temperature, which overlaps with a dome-shaped superconducting region [3,4,30,31].…”

Section: Introductionmentioning

confidence: 99%

“…For CsV 3 Sb 5 , it was experimentally [3,4] and theoretically [24,[36][37][38] reported that the CDW order is suppressed with increasing pressure and transforms into the pristine phase at a critical pressure P c ≈ 2 GPa. Around this quantum critical point (QCP), T c was measured to reach a maximum value of ∼8 K and then was continuously suppressed to disappear around ∼15 GPa [3,4,[33][34][35]. This superconducting dome is designated as the SC-I region, while there is another superconducting dome (designated as the SC-II region) between 15 and 50 GPa [33][34][35].…”

Section: Introductionmentioning

confidence: 99%

“…Around this quantum critical point (QCP), T c was measured to reach a maximum value of ∼8 K and then was continuously suppressed to disappear around ∼15 GPa [3,4,[33][34][35]. This superconducting dome is designated as the SC-I region, while there is another superconducting dome (designated as the SC-II region) between 15 and 50 GPa [33][34][35]. The P − T phase diagram in the SC-I region resembles those of many correlated electron systems such as heavy fermion f -electron compounds [39], high T c superconducting cuprates [40,41], and Fe-based superconductors [42,43], where quantum fluctuations associated with magnetic or nematic quantum states are the essential ingredients for the SC around the QCP.…”

Section: Introductionmentioning

confidence: 99%

“…The P − T phase diagram in the SC-I region resembles those of many correlated electron systems such as heavy fermion f -electron compounds [39], high T c superconducting cuprates [40,41], and Fe-based superconductors [42,43], where quantum fluctuations associated with magnetic or nematic quantum states are the essential ingredients for the SC around the QCP. In this regard, CDW fluctuations around the QCP have been speculated for the emergence of a pressure-induced superconducting dome in CsV 3 Sb 5 [3,4,[33][34][35]. Meanwhile, several firstprinciples calculations [37,38] for CsV 3 Sb 5 showed that the EPC plays an important role in the variation of SC with re-spect to pressure, supporting a phonon-mediated BCS type mechanism of SC.…”

Section: Introductionmentioning

confidence: 99%

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Charge density wave and superconductivity in the kagome metal CsV$_3$Sb$_5$ around a pressure-induced quantum critical point

Wang¹,

Liu²,

Jeon³

et al. 2022

Preprint

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Using first-principles density functional theory calculations, we investigate the pressure-induced quantum phase transition (QPT) from the charge density wave (CDW) to the pristine phase in the layered kagome metal CsV 3 Sb 5 consisting of three-atom-thick Sb−V 3 Sb−Sb and one-atom-thick Cs layers. The CDW structure having the formation of trimeric and hexameric V atoms with buckled Sb honeycomb layers features an increase in the lattice parameter along the c axis, compared to its counterpart pristine structure having the ideal V 3 Sb kagome and planar Sb honeycomb layers. Consequently, as pressure increases, the relatively smaller volume of the pristine phase contributes to reducing the enthalpy difference between the CDW and pristine phases, yielding a pressure-induced QPT at a critical pressure P c of ∼2 GPa. Furthermore, we find that (i) the superconducting transition temperature T c increases around P c due to a phonon softening associated with the periodic lattice distortion of V trimers and hexamers and that (ii) above P c , optical phonon modes are hardened with increasing pressure, leading to monotonous decreases in the electron-phonon coupling constant and T c . Our findings not only demonstrate that the uniaxial strain along the c axis plays an important role in the QPT observed in CsV 3 Sb 5 , but also provide an explanation for the observed superconductivity around P c in terms of a phonon-mediated superconducting mechanism.

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Section: B Superconductivity Of Compressed Csv 3 Sb 5 Around Qcpmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Charge density wave and superconductivity in the kagome metal CsV$_3$Sb$_5$ around a pressure-induced quantum critical point

Wang¹,

Liu²,

Jeon³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

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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Electrical and thermal transport properties of kagome metals AV3Sb5 (A = K, Rb, Cs)

Yang

Gan

et al. 2022

Tungsten

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Pressure-Induced Dimensional Crossover in a Kagome Superconductor

Cited by 34 publications

References 36 publications

Charge density wave and superconductivity in the kagome metal CsV$_3$Sb$_5$ around a pressure-induced quantum critical point

Charge density wave and superconductivity in the kagome metal CsV$_3$Sb$_5$ around a pressure-induced quantum critical point

Modulations in Superconductors: Probes of Underlying Physics

Electrical and thermal transport properties of kagome metals AV3Sb5 (A = K, Rb, Cs)

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