General theory of robustness against disorder in multi-band superconductors

Cavanagh, D. C.; Brydon, P. M. R.

doi:10.48550/arxiv.2103.09447

Cited by 2 publications

(2 citation statements)

References 45 publications

(111 reference statements)

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“…There is an extensive literature on the effect of impurities on the pairing state in pnictides, see e.g. [13][14][15][16][17][18][19]. Of specific interest to the present work, it is in the context of the physics of these materials that it was shown [20,21] that disorder may actually boost superconductivity either by changing the corresponding scattering rates or, as in the case of stoichiometric substitutions, by varying the relative anisotropy of the Fermi pockets [22,23].…”

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confidence: 90%

Inhomogeneous magnetic multiband superconductors

Dzero,

Levchenko

2021

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We consider a problem of superconductivity coexistence with the spin-density-wave order in disordered multiband metals. It is assumed that random variations of the disorder potential on short length scales render the interactions between electrons to become spatially correlated. As a consequence, both superconducting and magnetic order parameters become spatially inhomogeneous and are described by the universal phenomenological quantities, whereas all the microscopic details are encoded in the correlation function of the coupling strength fluctuations. We consider a minimal model with two nested two-dimensional Fermi surfaces and disorder potentials which include both intra-and inter-band scattering. The model is analyzed using the quasiclassical approach to show that short-scale pairing-potential disorder leads to a broadening of the coexistence region.

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confidence: 90%

Inhomogeneous magnetic multiband superconductors

Dzero,

Levchenko

2021

Preprint

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“…In particular, the robustness of a BG-FS against disorder is considered, and we prove that the Anderson theorem is violated for a BG-FS in accordance with common wisdom. Considering both arbitrary pairings and generic disorder potentials, we quantify the fragility of a superconducting state and generalize the concept of superconducting fitness function and the previous literature [61][62][63][64][65]. See SM for more information.…”

Section: Statesmentioning

confidence: 99%

Using Disorder to Identify Bogoliubov Fermi-Surface States

Oh,

Agterberg,

Moon

2021

Preprint

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We argue that a superconducting state with a Fermi-surface of Bogoliubov quasiparticles, a Bogoliubov Fermi-surface (BG-FS), can be identified by the dependence of physical quantities on disorder. In particular, we show that a linear dependence of the residual density of states at weak disorder distinguishes a BG-FS state from other nodal superconducting states. We further demonstrate the stability of supercurrent against impurities and a characteristic Drude-like behavior of the optical conductivity. Our results can be directly applied to electron irradiation experiments on candidate materials of BG-FSs, including Sr2RuO4, FeSe1−xSx, and UBe13.

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General theory of robustness against disorder in multi-band superconductors

Cited by 2 publications

References 45 publications

Inhomogeneous magnetic multiband superconductors

Inhomogeneous magnetic multiband superconductors

Using Disorder to Identify Bogoliubov Fermi-Surface States

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