Relationship between superconductivity and nematicity in 
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Kurokawa, Hodaka; Nakamura, Sota; Zhao, Jia-Hui; Shikama, Naoki; Sakishita, Yuki; Sun, Yue; Nabeshima, Fuyuki; Imai, Yoshio; Kitano, Haruhisa; Maeda, Akiko

doi:10.1103/physrevb.104.014505

Cited by 5 publications

(12 citation statements)

References 69 publications

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“…Tl2Ba2CuO6+x [21,22]) or Fe-pnictides [18]. This gives a unique ability for  to be decreased [23] and Hc to be increased [24] up to the highest possible overdoping, unlike other cuprates [21,25] and Fe-pnictides [26] for whichis minimized at the optimum Tc doping. An indication of the possible gain in terms of enhancing Jd by tuning the carrier concentration is observed in the specific-heat jump (directly related to Hc) that for y=7 (p=0.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic approach for enhancing superconducting critical current performance

et al. 2022

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The addition of artificial pinning centers has led to an impressive increase in the critical current density (Jc) of superconductors, enabling record-breaking all-superconducting magnets and other applications. The Jc of superconductors has reached ~0.2–0.3 Jd, where Jd is the depairing current density, and the numerical factor depends on the pinning optimization. By modifying λ and/or ξ, the penetration depth and coherence length, respectively, we can increase Jd. For (Y0.77Gd0.23)Ba2Cu3Oy ((Y,Gd)123), we can achieve this by controlling the carrier density, which is related to λ and ξ. We can also tune λ and ξ by controlling the chemical pressure in Fe-based superconductors, i.e., BaFe2(As1−xPx)2 films. The variation in λ and ξ leads to an intrinsic improvement in Jc via Jd, allowing extremely high values of Jc of 130 MA/cm2 and 8.0 MA/cm2 at 4.2 K, consistent with an enhancement in Jd of a factor of 2 for both incoherent nanoparticle-doped (Y,Gd)123 coated conductors (CCs) and BaFe2(As1−xPx)2 films, showing that this new material design is useful for achieving high critical current densities in a wide array of superconductors. The remarkably high vortex-pinning force in combination with this thermodynamic and pinning optimization route for the (Y,Gd)123 CCs reached ~3.17 TN/m3 at 4.2 K and 18 T (H||c), the highest values ever reported for any superconductor.

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Section: Introductionmentioning

confidence: 99%

Thermodynamic approach for enhancing superconducting critical current performance

et al. 2022

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“…This significant enhancement of T c stands in contrast to the behavior observed in FeSe 1−x Te x bulk [29,31], FeSe 1−x S x bulk [31,32] and FeSe 1−x S x film [33], suggesting that the influence of nematicity on T c is complicated within these materials. Furthermore, it was found that in the low temperature region, there are changes in the temperature dependencies of penetration depth and quasiparticle scattering rate at the nematic boundary obtained from complex conductivity, as reported in [34]. However, the complex conductivity of thin film remains unexplored in the vicinity of T c as of yet.…”

Section: Introductionmentioning

confidence: 73%

“…where σ ≡ σ1 − iσ 2 = µ 0 ωλ 2 0 (σ 1 − iσ 2 ), representing the dimensionless conductivity. While it is well-known that multiple carriers are involved in superconductivity, we deliberately proceeded the analysis considering a single band, assuming that the temperature dependence of τ in both hole and electron pockets could be represented using a single τ as in previous studies [34]. As the temperature dependence of τ remained unaffected considerably FIG.…”

Section: Resultsmentioning

confidence: 99%

“…The complex conductivity of FeSe 1−x Te x (x = 0 -0.5) films was measured using the cavity perturbation technique. For very thin films (d ≪ λ), conventional cavity perturbation measurements in microwave magnetic fields [42] are restricted to low-temperature ranges, spanning from the lowest temperature to at most approximately 0.7 T c [34]. This limitation arises because the electromagnetic field configuration undergoes significant changes depending on the temperature region, either T ≥ T c and T ≪ T c , as elucidated by Barannik et al [43].…”

Section: B Measurements and Analysismentioning

confidence: 99%

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Case study: Experimental study on optimum level of synthetic speech simulating Lombard effect

2020

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The Lombard effect is an acoustic effect associated with human speech in noisy environments. By simulating the Lombard effect in synthetic speech, the intelligibil- ity of synthetic speech in noisy environments is improved. However, it is known that human speech characterized by the Lombard effect increases annoyance in addition to intelligibility. Therefore, the influence of the Lombard effect on synthetic speech in a noisy environment was examined in detail, considering not only intelligibility but also other criteria. It was found that the suitability of speech reproduction in- creased upon using the Lombard effect in a noisy environment. By simulating the Lombard effect in synthetic speech, the intelligibility of synthetic speech in noisy environments is improved. However, it is known that human speech characterized by the Lombard effect increases annoyance in addition to intelligibility. Therefore, the influence of the Lombard effect on synthetic speech in a noisy environment was examined in detail, considering not only intelligibility but also other criteria. It was found that the suitability of speech reproduction increased upon using the Lombard effect in a noisy environment.

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“…temperature, T c , which can be an increased from 9 K to 40 K, for example monolayer film engineering, carrier doping and intercalation [3]. Substitution of Se by Te shrinks the lattice cell of FeSe, resulting in negative chemical pressure [4]. To easily control the electronic state, chemical modulation has the advantage of ambient pressure operation compared with the above-mentioned techniques.…”

Section: Introductionmentioning

confidence: 99%

Effect of carbon doping on magnetic flux pinning and superconducting performance in FeSe_0.5Te_0.5 single crystals

Zhang¹,

Hänisch²,

Yang³

et al. 2023

Supercond. Sci. Technol.

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A series of carbon-doped single crystals with nominal compositions FeSe0.5Te0.5 were synthesized by self-flux method. X-ray diffraction indicated that the lattice parameter c increases with increasing carbon content, suggesting carbon atoms enter the lattice. The critical current densities were measured and the flux pinning mechanism and its change with doping were analyzed. These samples showed a higher Jc in high magnetic fields as well as a narrower superconducting transition. We have studied the impact of the carbon introduction into FeSe0.5Te0.5 on the temperature dependence of the irreversibility field Hirr(T) and upper critical (Hc2). The pinning mechanism is obtained in the system via the Jc analysis.

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Relationship between superconductivity and nematicity in FeSe1−xTex (x=0−0.5)

Cited by 5 publications

References 69 publications

Thermodynamic approach for enhancing superconducting critical current performance

Thermodynamic approach for enhancing superconducting critical current performance

Case study: Experimental study on optimum level of synthetic speech simulating Lombard effect

Effect of carbon doping on magnetic flux pinning and superconducting performance in FeSe_0.5Te_0.5 single crystals

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Relationship between superconductivity and nematicity in FeSe1−xTex (x=0−0.5)

Cited by 5 publications

References 69 publications

Thermodynamic approach for enhancing superconducting critical current performance

Thermodynamic approach for enhancing superconducting critical current performance

Case study: Experimental study on optimum level of synthetic speech simulating Lombard effect

Effect of carbon doping on magnetic flux pinning and superconducting performance in FeSe0.5Te0.5 single crystals

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Effect of carbon doping on magnetic flux pinning and superconducting performance in FeSe_0.5Te_0.5 single crystals