Effect of Composition Disorder in a System of Superconducting Granules on the Superconducting Properties of La2–xSrxCuO4 Ceramic Samples

Далакова, Н. В.; Beliayev, E. Yu.; Savina, Yu. O.; Yuzephovich, O. I.; Bengus, S. V.; Бобрышева, Н. П.

doi:10.3103/s106287381807016x

Cited by 3 publications

(3 citation statements)

References 4 publications

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“…Nowadays, low temperatures properties of superconducting doped La 2-x Sr x CuO 4 continue to be intensively investigated [26].…”

Section: Introductionmentioning

confidence: 99%

“…Sometime later it was observed that in disordered La2-xSrxCuO4 doped with non-magnetic Sr impurities (Sr is an alkali earth metal), the transition temperature Tc started to decrease rapidly (Momono et al 1996). Nowadays, low temperatures properties of superconducting doped La2-xSrxCuO4 continue to be intensively investigated (Dalakova et al 2018).…”

Section: Introductionmentioning

confidence: 99%

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Scattering Due to Non-magnetic Disorder in 2D Anisotropic d-wave High T<sub>c</sub> Superconductors

Contreras¹,

Osorio²

2021

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Inspired by the studies on the influence of transition metal impurities in high Tc superconductors and what is already known about nonmagnetic suppression of T c in unconventional superconductors, we set out to investigate the behavior of the nonmagnetic disordered elastic scattering for a realistic 2D anisotropic high T c superconductor with line nodes and a Fermi surface in the tight-binding approximation. For this purpose, we performed a detailed self-consistent 2D numerical study of the disordered averaged scattering matrix with nonmagnetic impurities and a singlet line nodes order parameter, varying the concentration and the strength of the impurities potential in the Born, intermediate and unitary limits. In a high T c anisotropic superconductor with a tight binding dispersion law averaging over the Fermi surface, including hopping parameters and an order parameter in agreement with experimental data, the tight-binding approximation reflects the anisotropic effects. In this study, we also included a detailed visualization of the behavior of the scattering matrix with different sets of physical parameters involved in the nonmagnetic disorder, which allowed us to model the dressed scattering behavior in different regimes for very low and high energies. With this study, we demonstrate that the scattering elastic matrix is affected by the non-magnetic disorder, as well as the importance of an order parameter and a Fermi surface in agreement with experiments when studying this effect in unconventional superconductors.

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“…Nowadays, low temperatures properties of superconducting doped La 2-x Sr x CuO 4 continue to be intensively investigated [26].…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Scattering Due to Non-magnetic Disorder in 2D Anisotropic d-wave High T<sub>c</sub> Superconductors

Contreras¹,

Osorio²

2021

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“…The impurity scattering disorder studies in the unitary limit for the elastic scattering cross-section (ECS) in a self-consistent manner is given by the real and imaginary parts of ω 6 ω + 3 0 and are plotted by the pair of points (8(9 ), :( 9)) with tight-binding anisotropic 2D parameters. TB anisotropic modeling allowed us to successfully fit experimental low temperature data in two unconventional multiband superconductors at very low temperatures [17][18][19][20][21][22][23] for the triplet compound Sr 2 RuO 4 , and [24][25][26][27][28] for the HTSC La 2-x Sr x CuO 4 .…”

Section: Introductionmentioning

confidence: 99%

Tight-Binding Superconducting Phases in the Unconventional Compounds Strontium-Substituted Lanthanum Cuprate and Strontium Ruthenate

Contreras¹,

Osorio²,

Beliayev³

2022

AJMP

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We use the idea of the Wigner probability distribution (WPD) in a reduced scattering phase space (RPS) for the elastic scattering cross-section, with the help of a Tight-Binding (TB) numerical procedure allowing us to consider the anisotropic quantum effects, to phenomenologically predict several phases in these two novel unconventional superconductors. Unlike our previous works with pieces of evidences that these two compounds are in the unitary strong scattering regime and that superconductivity is suppressed by the atoms of strontium in both materials, several phases are built. In the case of the strontium-substituted lanthanum cuprate, it was found three phases from one family of Wigner probabilistic distributions, one corresponding to the antiferromagnetic compound La 2 CuO 4 another one which consists of a coalescing metallic phase for very lightly doped La 2-x Sr x CuO 4 , and finally a strong self-consistent dependent strange metal phase with optimal levels of doping. In the case of a triplet superconductor strontium ruthenate, three phases can be differentiated from two families of Wigner distribution probabilities, one family of WDP with point nodes where Cooper pairs and dressed scattered normal quasiparticles are mixed for the whole range of frequencies and which correspond to a FS γ-flat-sheet in the ground metallic state, and two phases from another WPD family, where, in one of then, the Miyake-Narikiyo quasinodal tiny gap model allows the unique presence of Cooper pairs in a tiny interval of frequencies near the superconducting transition T C , the other phase corresponds to the mixed phase with Cooper pairs and dressed by stoichiometric strontium non-magnetic atoms, where strong self-consistent effects are noticeable. This approach allows comparing experimental results for samples in both compounds with numerical analysis studies.

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Dressed behavior of the quasiparticles lifetime in the unitary limit of two unconventional superconductors

Contreras

Osorio

Beliayev

2022

Low Temperature Physics

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We compare the quasiparticle lifetime behavior in the unitary limit of two unconventional superconductors dressed by nonmagnetic impurity scattering to differentiate an anomalous functional behavior in its shape when the disorder concentration is changed in a triplet paired model with respect to the well behave singlet model. For singlet paired superconductors, the functional shape of the lifetime due to elastic scattering around the nodal regions in the reduced elastic scattering space, does not change with the disorder concentration, but for a triplet model with a tiny gap, an anomalous drop in shape is observed only when small values of disordering are added. We use a 2D tight-binding parametrization to study the reduced phase space of the first Brillouin zone, where the low-energy scattering is restricted to the nodal/quasinodal regions for two irreducible representations of the crystal lattice. A new class of Wigner probabilistic distribution functions is discussed for triplet superconductors.

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Effect of Composition Disorder in a System of Superconducting Granules on the Superconducting Properties of La2–xSrxCuO4 Ceramic Samples

Cited by 3 publications

References 4 publications

Scattering Due to Non-magnetic Disorder in 2D Anisotropic d-wave High T<sub>c</sub> Superconductors

Scattering Due to Non-magnetic Disorder in 2D Anisotropic d-wave High T<sub>c</sub> Superconductors

Tight-Binding Superconducting Phases in the Unconventional Compounds Strontium-Substituted Lanthanum Cuprate and Strontium Ruthenate

Dressed behavior of the quasiparticles lifetime in the unitary limit of two unconventional superconductors

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Effect of Composition Disorder in a System of Superconducting Granules on the Superconducting Properties of La2–xSrxCuO4 Ceramic Samples

Cited by 3 publications

References 4 publications

Scattering Due to Non-magnetic Disorder in 2D Anisotropic d-wave High T&lt;sub&gt;c&lt;/sub&gt; Superconductors

Scattering Due to Non-magnetic Disorder in 2D Anisotropic d-wave High T&lt;sub&gt;c&lt;/sub&gt; Superconductors

Tight-Binding Superconducting Phases in the Unconventional Compounds Strontium-Substituted Lanthanum Cuprate and Strontium Ruthenate

Dressed behavior of the quasiparticles lifetime in the unitary limit of two unconventional superconductors

Contact Info

Product

Resources

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Scattering Due to Non-magnetic Disorder in 2D Anisotropic d-wave High T<sub>c</sub> Superconductors

Scattering Due to Non-magnetic Disorder in 2D Anisotropic d-wave High T<sub>c</sub> Superconductors