Effect of magnetic (phase) inhomogeneities on the conductivity of an antiferromagnetic La2CuO4 + δ single crystal at low temperatures

Далакова, Н. В.; Белевцев, Б. И.; Beliayev, E. Yu.; Kolesnichenko, Yu. A.; Панфилов, А. С.; Braude, I. S.

doi:10.3103/s1062873808080376

Cited by 3 publications

(1 citation statement)

References 7 publications

(6 reference statements)

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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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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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Low-temperature nonlinear effects in the conductivity of lightly doped cuprates La2−xSrxCuO4 in antiferromagnetic state

Далакова

Белевцев

Belyaev

et al. 2014

Low Temperature Physics

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Low-temperature conductivity of antiferromagnetic cuprates La2−xSrxCuO4 prepared by solid-phase synthesis was investigated. The concentration of strontium in the samples was 0.01, 0.005 and 0.001. In the temperature range T < 100 K for all the samples the conduction mechanism corresponded to 3D variable-range hopping. For T > TN (where TN is the Neel temperature) a transition to the metallic type of conductivity was observed. Nonlinear effects in low-temperature conductivity, magnetoresistivity, as well as current-controlled negative differential resistance were found. It was established that the nonlinear behavior of conductivity intensified with decreasing the strontium concentration. For temperatures T < 10 K, the effect of positive magnetoresistance was observed. It is suggested that this effect can be attributed to the presence of a new low-temperature magnetic phase (spin density waves).

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Resistive properties of La2 − x Sr x CuO4 low-dopped cuprates in the antiferromagnetic state at low temperatures

Далакова

Белевцев

Бобрышева

et al. 2012

Bull. Russ. Acad. Sci. Phys.

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Effect of magnetic (phase) inhomogeneities on the conductivity of an antiferromagnetic La2CuO4 + δ single crystal at low temperatures

Cited by 3 publications

References 7 publications

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

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

Low-temperature nonlinear effects in the conductivity of lightly doped cuprates La2−xSrxCuO4 in antiferromagnetic state

Resistive properties of La2 − x Sr x CuO4 low-dopped cuprates in the antiferromagnetic state at low temperatures

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