Interplay between charge density wave order and superconductivity in 
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 under pressure

Du, Feng; Su, Hang; Luo, Shuaishuai; Shen, Bin; Nie, Z. Y.; Yin, Lichang; Chen, Y.; Li, R.; Smidman, M.; Yuan, H. Q.

doi:10.1103/physrevb.102.144510

Cited by 15 publications

(11 citation statements)

References 25 publications

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“…As a result, the spin-singlet SC and 3Q-iCDW repulsively interact each other, and f CDW&SC > 0 follows from the Cauthy-Schwartz inequality. This implies the opposing behaviour between the two critical temperatures, which is consistent with the tendency observed in experiments [48][49][50][51]. We emphasize that this opposing behavior is quite independent of the pairing symmetry and the conventional CDW order parameter beyond our simple model, since the condition, f CDW&SC > 0, is robust as long as u 5 > u 4 /2.…”

supporting

confidence: 89%

Intertwining orbital current order and superconductivity in Kagome metal

Yang¹,

Kim²,

Jeong³

et al. 2022

Preprint

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The nature of superconductivity in newly discovered Kagome materials, AV3Sb5 (A=K, Rb, Cs), has been a subject of intense debate. Recent experiments suggest the presence of orbital current order on top of the charge density wave (CDW) and superconductivity. Since the orbital current order breaks time-reversal symmetry, it may fundamentally affect possible superconducting states. In this work, we investigate the mutual influence between the orbital current order and superconductivity in Kagome metal with characteristic van Hove singularity (vHS). By explicitly deriving the Landau-Ginzburg theory, we classify possible orbital current order and superconductivity. It turns out that distinct unconventional superconductivities are expected, depending on the orbital current ordering types. Thus, this information can be used to infer the superconducting order parameter when the orbital current order is identified and vice versa. We also discuss possible experiments that may distinguish such superconducting states coexisting with the orbital current order.

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supporting

confidence: 89%

Intertwining orbital current order and superconductivity in Kagome metal

Yang¹,

Kim²,

Jeong³

et al. 2022

Preprint

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“…While our findings can be interpreted through a competition between charge order and superconductivity, there is a notable difference compared to systems such as LaAuSb 2 [22]. In the latter case, charge order is also suppressed with increasing pressure and disappears in a first-order-like fashion at a characteristic pressure p 0 ; however, there is a sudden jump in T c and a significant drop in the residual resistivity ρ 0 across p 0 , which is not seen in KV 3 Sb 5 .…”

contrasting

confidence: 56%

“…While a dome of unconventional superconductivity typically emerges as magnetic order is suppressed towards a putative quantum critical point [16][17][18], whether a similar picture holds for the interplay between charge order and superconductivity remains unsettled. Although a dome of superconductivity anchors around a charge order quantum critical point in Lu(Pt 1−x Pd x ) 2 In [19], in many other systems with coexisting superconductivity and charge order, the interplay was found to follow expectations of the Bardeen-Cooper-Schrieffer (BCS) theory [20][21][22].…”

mentioning

confidence: 97%

Interplay between charge order and superconductivity in the kagome metal KV$_3$Sb$_5$

Du,

Luo,

Ortiz

et al. 2021

Preprint

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The kagome metal KV3Sb5 hosts charge order, topologically nontrivial Dirac band crossings, and a superconducting ground state with unconventional characteristics. Here we study the evolution of charge order and superconductivity in KV3Sb5 under hydrostatic pressure using electrical resistivity measurements. With the application of pressure, the ambient pressure superconducting transition temperature Tc ≈ 0.9 K increases to ≈ 3.1 K at 0.4 GPa, while the charge ordering temperature T * decreases from 78 K to 50 K. Upon further increasing pressure, charge order disappears in a first-order-like fashion at a pressure p0 just above 0.4 GPa, and Tc undergoes a small reduction from 3.1 K for 0.4 GPa to 2.6 K for 2.25 GPa. Thus, relative to its ambient pressure value of ≈ 0.9 K, Tc is enhanced over a broad pressure range beyond p0. These results suggest that the increase of Tc with the suppression of charge order results from a competition between the two orders. In addition, the upper critical field µ0Hc2(T = 0) is significantly enhanced near the critical pressure p0, but µ0Hc2(T ) at various pressures can be well scaled.

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“…5(c)]. We note that a recent study on a very similar system showed the full suppression of the CDW at much lower pressure about ∼0.64 GPa [35]. In LaAu x Sb 2 system, it was shown that the CDW transition can be tuned by changing gold concentration [26].…”

Section: B High-pressure Resistivitymentioning

confidence: 58%

“…The application of pressure of ∼0.75 and ∼1.7 GPa leads to suppression of lower transition and upper transition, respectively [26]. Study of Xiang et al, did not indicate any observation of superconductivity in the LaAu x Sb 2 ; however, it should be noted that the minimum temperature they reached was 1.8 K. In contrast, a recent study by Du et al [35], showed superconductivity in LaAuSb 2 at an extremely low temperature of ∼0.6 K with a CDW transition around 78 K. Pressure of about 0.64 GPa is found to suppress the CDW transition completely which concurrently leads to an enhancement in the superconducting transition temperature to 1.05 K. Here, we investigate synchrotron xray powder-diffraction study as a function of temperature (from 390 to 110 K) and pressure (from 0 to 8.86 GPa) for LaAuSb 2 with very similar CDW properties. However, the CDW transition that we observe is about 83 K. Further, resistivity measurements as a function of temperature (300 to 4 K) under various hydrostatic pressures (0 to 3.14 GPa) and DFT calculations are performed to understand the correlation between structural and transport properties.…”

Section: Introductionmentioning

confidence: 86%

Pressure-dependent modifications in the LaAuSb2 charge density wave system

et al. 2021

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Hydrostatic pressure response of LaAuSb 2 charge density wave (CDW) system is investigated using electrical transport, x-ray diffraction (XRD), and density-functional theory (DFT). Resistivity data at ambient pressure evidence a clear CDW transition at 83 K. X-ray diffraction at ambient pressure reveals that in plane and out of plane axes show opposite behavior with decreasing temperature, in particular, out of plane c axis develops a distinct change at ∼250 K, much above the observed CDW transition at 83 K. The CDW transition shifts to low temperature with increasing pressure. Our resistivity data indicate a complete suppression of the CDW transition at ∼3.6 GPa. High-pressure XRD revealed a change from the linear trend for the out of plane (c) and the in plane (a) lattice parameters for pressure above 3.8 GPa. With compression, DFT indicated an anomaly in the c/a ratio around 8 GPa. The calculated electronic structure also indicated minor changes in the band structure in this pressure range. In addition, high-pressure DFT structural investigations reveal the LaAuSb 2 system to be stable up to pressures as high as 150 GPa.

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Interplay between charge density wave order and superconductivity in LaAuSb2 under pressure

Cited by 15 publications

References 25 publications

Intertwining orbital current order and superconductivity in Kagome metal

Intertwining orbital current order and superconductivity in Kagome metal

Interplay between charge order and superconductivity in the kagome metal KV$_3$Sb$_5$

Pressure-dependent modifications in the LaAuSb2 charge density wave system

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