Nodeless superconductivity in the kagome metal CsV3Sb5

Duan, Weiyin; Nie, Z. Y.; Luo, Shuaishuai; Yu, Fangwei; Ortiz, Brenden R.; Yin, Lichang; Su, Hang; Du, Feng; Wang, An; Chen, Ye; Lu, Xin; Ying, Jianjun; Wilson, Stephen D.; Chen, Xianhui; Song, Yu; Yuan, Huiqiu

doi:10.1007/s11433-021-1747-7

Cited by 133 publications

(48 citation statements)

References 39 publications

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“…4. The similar doping behaviors of m * and T c in the doped samples imply a BCS scenario, consistent with the s-wave paring [42,43]. The parent compound has the largest effective mass m * , but with a suppressed T c , consistent with the competition relationship between the CDW order and the superconductivity [15,16,[35][36][37][38].…”

supporting

confidence: 69%

“…However, it is unlikely the reason for the superconductivity since T c survives even when the doping of Ti pushes VHS1 above the Fermi level, at odds with the previous speculation of the nature of pairing around the VHS [41]. Recent NMR and magnetic penetration depth measurements [42,43] doping in Cs(V 1−x Ti x ) 3 Sb 5 . To investigate the relationship between the superconductivity and the Sb electron pocket, we compare the effective mass (m * ) of the Sb electron pocket at the Γ point (C3 band in Fig.…”

mentioning

confidence: 92%

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Doping evolution of superconductivity, charge order and band topology in hole-doped topological kagome superconductors Cs(V$_{1-x}$Ti$_x$)$_3$Sb$_5$

Liu¹,

Wang²,

Cai³

et al. 2021

Preprint

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The newly discovered Kagome superconductors AV3Sb5 (A = K, Rb, Cs) exhibit superconductivity, charge order, and band topology simultaneously. To explore the intricate interplay between the superconducting and charge orders, we investigate the doping evolution of superconductivity, charge-density-wave (CDW) order and band topology in doped topological kagome superconductors Cs(V1−xTix)3Sb5 where the Ti-dopant introduces hole-like charge carriers. Despite the absence of the CDW phase transition in doped compounds even for the lowest doping level of x = 0.047, the superconductivity survives in all doped samples with enhanced critical temperatures. The high-resolution angle-resolved photoemission spectroscopy (ARPES) measurements reveal that the Ti-dopant in the kagome plane lowers the chemical potential, pushing the van Hove singularity (VHS) at M point above the Fermi level. First-principle simulations corroborate the doping evolution of the band structure observed in ARPES, and affirm that the CDW instability does not occur once the VHS is pushed above the Fermi level, explaining the absence of the CDW ordering in our doped samples Cs(V1−xTix)3Sb5. Our results demonstrate a competition between the CDW and superconducting orders in the kagome-metal superconductor CsV3Sb5, although the superconductivity is likely inconsequential of the CDW order.

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supporting

confidence: 69%

mentioning

confidence: 92%

Doping evolution of superconductivity, charge order and band topology in hole-doped topological kagome superconductors Cs(V$_{1-x}$Ti$_x$)$_3$Sb$_5$

Liu¹,

Wang²,

Cai³

et al. 2021

Preprint

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“…They undergo a charge density wave (CDW) transition at T CDW = 78 K, 103 K, 94 K and a superconducting transition at T c =0.93 K, 0.92 K, and 2.5 K for A = K, Rb, Cs, respectively. The superconducting state is found to be spin singlet with s-wave pairing symmetry in the bulk state [6][7][8]. STM studies observed possible Majorana modes [9] and pair density wave [10] in the surface state.…”

mentioning

confidence: 93%

Tri-Hexagonal charge order in kagome metal CsV$_{3}$Sb$_{5}$ revealed by $^{121}$Sb NQR

Mu,

Yin,

et al. 2021

Preprint

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We report 121 Sb nuclear quadrupole resonance (NQR) measurements on kagome superconductor CsV3Sb5 with Tc = 2.5 K. 121 Sb NQR spectra split after a charge density wave (CDW) transition at 94 K, which demonstrates a commensurate CDW state. The coexistence of the high temperature phase and the CDW phase between 91 K and 94 K manifests that it is a first order phase transition. The CDW order exhibits Tri-Hexagonal deformation with a lateral shift between the adjacent kagome layers, which is consistent with 2×2×2 superlattice modulation. The superconducting state coexists with CDW order and shows a conventional s-wave behavior in the bulk state.

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“…The kagome metals AV 3 Sb 5 (A = K, Rb, Cs) [10][11][12][13] exhibit a giant anomalous Hall effect [14,15] in the absence of local magnetic moments [16], which may result from a chiral charge-density-wave (CDW) that breaks time-reversal symmetry [17][18][19][20][21]. Moreover, superconductivity with evidence for a fully-opened gap emerges at low-temperatures [22][23][24], and raises the possibility of topological superconductivity [25,26].…”

Section: Introductionmentioning

confidence: 99%

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

Du,

Li,

Luo

et al. 2021

Preprint

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The interplay of superconductivity with electronic and structural instabilities on the kagome lattice provides a fertile ground for the emergence of unusual phenomena. The vanadium-based kagome metals AV3Sb5 (A = K, Rb, Cs) exhibit superconductivity on an almost ideal kagome lattice, with the superconducting transition temperature Tc forming two domes upon pressure-tuning. The first dome arises from the competition between superconductivity and a charge-density-wave, whereas the origin for the second dome remains unclear. Herein, we show that the appearance of the second superconducting dome in KV3Sb5 and RbV3Sb5 is associated with transitions from hexagonal P 6/mmm to monoclinic P 2/m structures, evidenced by splitting of structural peaks from synchrotron powder X-ray diffraction experiments and imaginary phonon frequencies in first-principles calculations. In KV3Sb5, transition to an orthorhombic P mmm structure is further observed for pressure p 20 GPa, and is correlated with the strong suppression of Tc in the second superconducting dome. Our findings indicate distortions of the crystal structure modulates superconductivity in AV3Sb5 under pressure, providing a platform to study the emergence of superconductivity in the presence of multiple structural instabilities.

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Nodeless superconductivity in the kagome metal CsV3Sb5

Cited by 133 publications

References 39 publications

Doping evolution of superconductivity, charge order and band topology in hole-doped topological kagome superconductors Cs(V$_{1-x}$Ti$_x$)$_3$Sb$_5$

Doping evolution of superconductivity, charge order and band topology in hole-doped topological kagome superconductors Cs(V$_{1-x}$Ti$_x$)$_3$Sb$_5$

Tri-Hexagonal charge order in kagome metal CsV$_{3}$Sb$_{5}$ revealed by $^{121}$Sb NQR

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

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