2023
DOI: 10.1038/s41467-023-39495-1
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Optimized superconductivity in the vicinity of a nematic quantum critical point in the kagome superconductor Cs(V1-xTix)3Sb5

Abstract: CsV3Sb5 exhibits superconductivity at Tc = 3.2 K after undergoing intriguing two high-temperature transitions: charge density wave order at ~98 K and electronic nematic order at Tnem ~ 35 K. Here, we investigate nematic susceptibility in single crystals of Cs(V1-xTix)3Sb5 (x = 0.00-0.06) where double-dome-shaped superconducting phase diagram is realized. The nematic susceptibility typically exhibits the Curie‒Weiss behaviour above Tnem, which is monotonically decreased with x. Moreover, the Curie‒Weiss tempera… Show more

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Cited by 14 publications
(4 citation statements)
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“…Since the first-order CDW transition in CsV3Sb5 is sensitive to hydrostatic pressure [17,18,53,54] and uniaxial strain [55], this sharp peak feature could be easily affected by strain inhomogeneity, which may explain the absence of this feature in our previous study (see Extended Data Figure 1). Recently, similar temperature-dependent behavior of 𝑑(Δ𝑅/𝑅) 𝑥𝑥 𝑑𝜀 𝑥𝑥 ⁄ has also been observed by several other groups [56][57][58][59]. In general, elastoresistance responses can be decomposed into different contributions by considering the irreducible representation of strain, which are symmetric A1g = (εxx + εyy)/2 and asymmetric E2g = (εxx -εyy)/2 for our cases (Fig.…”
Section: Elastoresistance In Pristine Csv3sb5supporting
confidence: 86%
“…Since the first-order CDW transition in CsV3Sb5 is sensitive to hydrostatic pressure [17,18,53,54] and uniaxial strain [55], this sharp peak feature could be easily affected by strain inhomogeneity, which may explain the absence of this feature in our previous study (see Extended Data Figure 1). Recently, similar temperature-dependent behavior of 𝑑(Δ𝑅/𝑅) 𝑥𝑥 𝑑𝜀 𝑥𝑥 ⁄ has also been observed by several other groups [56][57][58][59]. In general, elastoresistance responses can be decomposed into different contributions by considering the irreducible representation of strain, which are symmetric A1g = (εxx + εyy)/2 and asymmetric E2g = (εxx -εyy)/2 for our cases (Fig.…”
Section: Elastoresistance In Pristine Csv3sb5supporting
confidence: 86%
“…Recently discovered superconducting kagome metals AV 3 Sb 5 (A = K, Rb, and Cs) have attracted wide attention because they host multiple quantum phases intertwined with each other, including charge density wave (CDW), superconductivity, and nematic order. 1–11 The CDW instability is commonly observed in the temperature range below T CDW ∼ 78–102 K. Below T CDW , other types of unconventional breakings of time-reversal 12–17 and rotational symmetry 5–7,18–21 have been reported as well. The superconducting phase is stabilized at T SC ∼ 1–3 K. 1,3…”
Section: Introductionmentioning
confidence: 99%
“…Specifically, the coupling between CDW order and SC in AV 3 Sb 5 compounds has been experimentally explored through several approaches. These include tracking the evolution of both order parameters as the system is perturbed via chemical pressure (Ortiz et al, 2023;Liu et al, 2022a,b;Zhou et al, 2023), change in dimensionality (Song et al, 2021;Wang et al, 2021;Song et al, 2023), external pressure (Wang et al, 2021;Feng et al, 2023;Zhu et al, 2022;Wang et al, 2021;Du et al, 2022;Yu et al, 2022;Zheng et al, 2022), uniaxial strain (Qian et al, 2021), and chemical doping (Oey et al, 2022a;Oey et al, 2022b;Liu et al, 2023;Ding et al, 2022;Sur et al, 2023). One function of these perturbations is to shift the chemical potential about the multiple Van Hove singularities nearby; however, the dominant perturbation in the case of doping is often considered to be the orbitally selective modification of the Sb p z pocket at the Γ point in the Brillouin zone (LaBollita and Botana, 2021).…”
Section: Introductionmentioning
confidence: 99%