Non-magnetic tight binding disorder effects in the γ sheet of Sr2RuO4.

Contreras, Pedro; Osorio, Dianela; Ramazanov, Shikhgasan

doi:10.31349/revmexfis.68.020502

Cited by 7 publications

(21 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As noticed firstly in [16] and also by us in [19][20], the gap on the γ sheet is very anisotropic and leaves a tiny gap ∆ γ 0 around four points, (0, ±π) and (±π, 0), but now we state that when |t| | F | there is not such a gap. According to group theory considerations, in this case as in the tiny gap MN model, the imaginary OP has two components which belong to the irreducible representation E 2u of the tetragonal point group D 4h [17].…”

Section: Introductionsupporting

confidence: 57%

See 1 more Smart Citation

Quasi-point versus point nodes in Sr2RuO4, the case of a flat tight binding γ sheet

Contreras¹,

Osorio²,

Tsuchiya

2022

Rev. Mex. Fís.

View full text Add to dashboard Cite

We perform a numerical study of the unitary regime as a function of disorder concentration in the imaginary part of the elastic scattering cross-section for the compound Sr2RuO4 in the flat band non-disperse limit. By using a self-consistent tight binding (TB) method, we find a couple of families of Wigner probabilistic functions that help to explain macroscopically the distribution between Fermion dressed quasiparticles and Cooper pairs, and also the position of nodes in the order parameter for Sr2RuO4. Therefore, we are able to show that a TB model for the FS γ-sheet, numerically shows 4 point nodes in a flat γ sheet limit, or 4 quasi-point nodes for strong dispersion γ sheet limit in the reduced phase scattering space (RPS).

show abstract

Section: Introductionsupporting

confidence: 57%

“…In this research, we set up a new numerical study with almost non dispersion in ξ γ (k x , k y ), i.e., when |t| | F |, in contrast with our previously studied [19][20] where we used…”

Section: Introductionmentioning

confidence: 99%

Quasi-point versus point nodes in Sr2RuO4, the case of a flat tight binding γ sheet

Contreras¹,

Osorio²,

Tsuchiya

2022

Rev. Mex. Fís.

View full text Add to dashboard Cite

show abstract

“…The calculation in the unitary scattering limit for stoichiometric Sr, the width at zero frequencies will be stronger than for the doped LaCuO ceramic [13], changing the zero frequency value and the width of the Wigner probabilistic distribution as a function of Γ . See table 2 for the values.…”

Section: Wigner Probabilistic Distribution For a Flat γ -Sheet With P...mentioning

confidence: 98%

“…), that correspond to a tiny MN interval with only boson quasiparticles and another phase shadowed gray ((Γ >= 0.10 meV).) that mixes both types of quasiparticles, bosons and dressed normal quasiparticles [13,14,39]. The calculation is in the the unitary scattering limit for stoichiometric Sr with point nodes and a tiny gap, the width at zero frequencies will be stronger than for the strontium doped LaCuO ceramic and the previous ground state family of plots for stoichiometry Sr 2 RuO 4 , increasing its zero frequency values and the width of the Wigner probabilistic distributions as a function of the non-magnetic disorder concentration Γ , as can bee seen in Table 3.…”

Section: Wigner Probabilistic Distribution For Quasi-point Triplet Nodesmentioning

confidence: 99%

See 1 more Smart Citation

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

Contreras¹,

Osorio²,

Beliayev³

2022

AJMP

Self Cite

View full text Add to dashboard Cite

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.

show abstract

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

Contreras

Osorio

Beliayev

2022

Low Temperature Physics

View full text Add to dashboard Cite

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.

show abstract

Non-magnetic tight binding disorder effects in the γ sheet of Sr2RuO4.

Cited by 7 publications

References 25 publications

Quasi-point versus point nodes in Sr2RuO4, the case of a flat tight binding γ sheet

Quasi-point versus point nodes in Sr2RuO4, the case of a flat tight binding γ sheet

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

About