Anisotropy and reversible magnetization of the infinite-layer superconductor<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>0.9</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">La</mml:mi></mml:mrow><mml:mrow><mml:mn>0.1</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CuO</mml:mi></

Kim, Mun-Seog; Lemberger, Thomas R.; Jung, C. U.; Choi, Jae-Hyuk; Kim, J. Y.; Kim, Heon‐Jung; Lee, Sung‐Ik

doi:10.1103/physrevb.66.214509

Cited by 29 publications

(13 citation statements)

References 35 publications

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“…Taking both sources of errors into account yielded: λ ab (0) = 157(15) nm and λ c (0) = 1140(100) nm. The value of λ ab (0) obtained here was in a good agreement with the λ ab (0) = 147(7) nm reported by Kim et al [38] based on the analysis of reversible magnetization data. In order to test the predictions of [18][19][20][21][22] and in analogy to our previous results on cuprate HTSs [15][16][17]34], the experimental data presented in Figure 2 were analyzed by decomposing λ −2 ab (T) and λ −2 c (T) into two contributions with s-wave and d-wave symmetry [39]:…”

Section: Resultssupporting

confidence: 92%

Suppression of the s-Wave Order Parameter Near the Surface of the Infinite-Layer Electron-Doped Cuprate Superconductor Sr0.9La0.1CuO2

et al. 2020

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The temperature dependencies of the in-plane (λab) and out-of-plane (λc) components of the magnetic field penetration depth were investigated near the surface and in the bulk of the electron-doped superconductor Sr0.9La0.1CuO2 by means of magnetization measurements. The measured λab(T) and λc(T) were analyzed in terms of a two-gap model with mixed s+d-wave symmetry of the order parameter. λab(T) is well described by an almost pure anisotropic d-wave symmetry component (≃96%), mainly reflecting the surface properties of the sample. In contrast, λc(T) exhibits a mixed s+d-wave order parameter with a substantial s-wave component of more than 50%. The comparison of λab−2(T) measured near the surface with that determined in the bulk by means of the muon-spin rotation/relaxation technique demonstrates that the suppression of the s-wave component of the order parameter near the surface is associated with a reduction of the superfluid density by more than a factor of two.

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Section: Resultssupporting

confidence: 92%

Suppression of the s-Wave Order Parameter Near the Surface of the Infinite-Layer Electron-Doped Cuprate Superconductor Sr0.9La0.1CuO2

et al. 2020

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“…The curves systematically shift towards the left with the increase in the applied magnetic field. Similar shifting in the reversible magnetization curves has also been observed in the case of conventional [36] as well as layered superconductors [37]. The match between the theoretical and experimental results is very good.…”

Section: Reversible Magnetizationsupporting

confidence: 81%

Investigations of Transient Ne-like Fe X-Ray Lasers Pumped by Femtosecond Laser System

Lin¹

2001

Jpn. J. Appl. Phys.

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Experiments carried out on the intermetallic superconducting material MgB 2 have shown anomalous magnetic field dependence of upper critical field, small angle neutron scattering form factor, specific heat, critical current etc. Similarly, scanning tunnelling microscopy (STM) experiments on vortex structures have shown unusually large vortex core size and two different magnetic and spatial field scales. Also, whereas the specific heat measurements and isotope shift experiments have shown Bardeen-Cooper-Schrieffer-like (BCS-like) behaviour, the temperature dependences of the penetration depth experiments have shown non-BCS-like behaviour. These anomalous behaviours have been attributed to the multiband superconductivity of this material and the nature of the local spatial behaviour of the magnetic induction and the order parameter components having two length scales. We report an analytical investigation of the effect of two length scales on the temperature and the applied magnetic field dependence of several properties of MgB 2 , such as, the penetration depth, single vortex and vortex lattice structure, vortex core radius, reversible magnetization, critical current, small angle neutron scattering form factor and the shear modulus of the vortex lattice within the framework of two-order parameter Ginzburg-Landau theory. We solve the corresponding nonlinear Ginzburg-Landau equations numerically exactly using an iterative method for arbitrary applied field H c1 < H < H c2 , the Ginzburg-Landau parameter and vortex lattice symmetry. This enables us to compute the local spatial behaviour of the magnetic induction and the order parameters accurately for arbitrary applied field and a wide range of temperature. Comparison of the analytical results with experiments on MgB 2 gives very good agreement.

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“…We note that the positive curvature in H c2 (T ) presented here is triggered by defects/phase inhomogeneities cannot be excluded. For comparison, the H c2 measured for the [(IL-CaCuO 2 ) n /(Ca 2 Fe 2 O 5 ) m ] N superlattices is larger than that of 13.9 T reported for electron-doped IL-cuprates, where T c is higher rather than the superlattices presented here [45]. Using H * c2 (0) = 28.03 T, we calculated a coherence length ξ = (φ 0 /2πH * c2 (0)) 1/2 for the [(IL-CaCuO 2 ) n /(Ca 2 Fe 2 O 5 ) m ] N superlattices and obtained ξ = 34.3 Å.…”

Section: Direct Comparison Of Structural Imaging Data Between [(Il-contrasting

confidence: 67%

Superconductivity in infinite-layer CaCuO2-brownmillerite Ca2Fe2O5 superlattices

Ikeda¹,

Krockenberger²,

Taniyasu³

et al. 2021

Preprint

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High-temperature cuprate superconductors have naturally a superlattice structure. Infinite-layer CaCuO2 is the common ingredient of cuprates with superconducting transition temperatures above 100 K. However, infinite-layer CaCuO2 by itself does not superconduct. Here we show that superconductivity emerges in artificial superlattices built from infinite-layer CaCuO2 and brownmillerite Ca2Fe2O5 grown by molecular beam epitaxy. X-ray diffraction and electron microscopy characterizations showed that the crystal quality of the infinite-layer CaCuO2 in the superlattices significantly improved compared to bare thin-films of CaCuO2. We found that the induction of superconductivity in [( CaCuO2)n(Ca2Fe2O5)m] N superlattices is also subject to the oxidizing environment used during the cool-down procedure and therefore to a minimization of oxygen vacancies within the CuO2 planes. The inserted Ca2Fe2O5 layers buffer charge imbalances triggered by point defect formation during growth, minimizing cationic defects in the infinite-layer CaCuO2 layers thus stabilizing monolithic infinite-layer CaCuO2 slabs; embedding CaCuO2 within a superlattice enables extended two-dimensional CuO2 planes and therefore superconductivity while Ca2Fe2O5 serves similar to the charge-reservoir layers in the cuprate superconductors synthesized from incongruent melts.

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Anisotropy and reversible magnetization of the infinite-layer superconductorSr0.9La0.1CuO

Cited by 29 publications

References 35 publications

Suppression of the s-Wave Order Parameter Near the Surface of the Infinite-Layer Electron-Doped Cuprate Superconductor Sr0.9La0.1CuO2

Suppression of the s-Wave Order Parameter Near the Surface of the Infinite-Layer Electron-Doped Cuprate Superconductor Sr0.9La0.1CuO2

Investigations of Transient Ne-like Fe X-Ray Lasers Pumped by Femtosecond Laser System

Superconductivity in infinite-layer CaCuO2-brownmillerite Ca2Fe2O5 superlattices

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