Dynamical instability of the electric transport in superconductors

Qiao, Lei; Li, Dingping; Postolova, S. V.; Mironov, Andrey E.; Vinokur, V. M.; Rosenstein, Baruch

doi:10.1038/s41598-018-32302-8

Cited by 13 publications

(10 citation statements)

References 39 publications

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“…In disordered ALD deposited TiN films, these voltage jumps in V (I) occur at T ≃ T BKT , i.e. when α switches from 1 to 3 41 . Hence, we observe that the T BKT transition vanishes while T c remains non-zero.…”

Section: Suppression Of Superconductivity In Set-3mentioning

confidence: 99%

Superconducting phase transitions in disordered NbTiN films

Burdastyh

Postolova

Proslier

et al. 2020

Sci Rep

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The suppression of superconductivity in disordered systems is a fundamental problem of condensed matter physics. Here we investigate the superconducting niobium-titanium-nitride (Nb 1−x TixN) thin films grown by atomic layer deposition (ALD) where disorder is controlled by the slight tuning of the ALD process parameters. We observe the smooth crossover from the disorderdriven superconductor-normal metal transition (often reffered to as fermionic mechanism) to the case where bosonic mechanism dominates and increasing disorder leads to formation of metal with Cooper pairing. We show that, in 'moderately' disordered films, the transition to zero-resistance state occurs in a full agreement with the conventional theories of superconducting fluctuations and Berezinskii-Kosterlitz-Thouless transition. However, the 'critically' disordered films violate this accord showing low-temperature features possibly indicating the Bose metal phase. We show that it is the interrelation between film's sheet resistance in the maximum, Rmax, of the resistive curve R✷(T ) and Rq = h/4e 2 that distinguishes between these two behaviors. We reveal the characteristic features in magnetoresistance of the 'critically' disordered films with Rmax > Rq. 2/9

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Section: Suppression Of Superconductivity In Set-3mentioning

confidence: 99%

Superconducting phase transitions in disordered NbTiN films

Burdastyh

Postolova

Proslier

et al. 2020

Sci Rep

Self Cite

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“…Usually it is difficult to ensure very good thermal contact of a sample and a thermometer even when they are stuck together. Strongly non-linear current and the temperature dependence of the resistivity result in uncontrollable heating of the sample [41] and the I-V characteristics may acquire even an S-shape form [42]. Therefore, we believe that for unambiguous identification of the BKT transition in HTSC, simultaneous measurements of the resistivity both in the ab-plane and along the c-axis are necessary.…”

Section: Discussionmentioning

confidence: 99%

BKT transition observed in magnetic and electric properties of YBa2Cu3O7−δ single crystals

Nizhankovskiy

Rogacki

2019

Phys. Rev. B

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Superconductivity of YBa2Cu3O 7−δ single crystals was investigated in small magnetic fields. In magnetic measurements the superconducting transition for H c appears 0.4 K higher than for H⊥c. In this temperature range superconductivity is two-dimensional and the total thickness of superconducting layers is about 0.83 of the sample thickness, which is a consequence of the occurrence of the quasi-insulating plane in the unit cell of the crystal structure. Resistivity in the ab-plane and along the c-axis was measured simultaneously. In these measurements two-dimensional superconductivity was observed in a temperature range of 0.6-0.8 K with the clear signs of the Berezinskii-Kosterlitz-Touless (BKT) transition which occurs approximately 0.15 K below Tc, the mean-field transition temperature.

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“…] and the GL coherence length was extracted to be ξ GL = 7.7 nm. Owing to the fact that l ξ GL λ L , where the London penetration depth λ L for disordered superconductors is typically hundreds of nanometers [52][53][54], the material is confirmed to be a bulk-like, dirty type-II superconductor. While for the perpendicular fields, a deviation from the empirical GL formula was observed where the curve has an upward curvature at low fields and saturates to a higher critical fields with weaker temperature dependency (fitting details see Supplementary materials, Supplementary Fig.…”

Section: Electrical Transport Studiesmentioning

confidence: 99%

Ultrahigh-inductance materials from spinodal decomposition

Gao,

Ku,

Deng

et al. 2021

Preprint

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Disordered superconducting nitrides with kinetic inductance have long been considered a leading material candidate for high-inductance quantum-circuit applications. Despite continuing efforts in reducing material dimensions to increase the kinetic inductance and the corresponding circuit impedance, it becomes a fundamental challenge to improve further without compromising material qualities. To this end, we propose a method to drastically increase the kinetic inductance of superconducting materials via spinodal decomposition while keeping a low microwave loss. We use epitaxial Ti0.48Al0.52N as a model system, and for the first time demonstrate the utilization of spinodal decomposition to trigger the insulator-to-superconductor transition with a drastically enhanced material disorder. The measured kinetic inductance has increased by 2-3 orders of magnitude compared with all the best reported disordered superconducting nitrides. Our work paves the way for substantially enhancing and deterministically controlling the inductance for advanced superconducting quantum circuits.

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Dynamical instability of the electric transport in superconductors

Cited by 13 publications

References 39 publications

Superconducting phase transitions in disordered NbTiN films

Superconducting phase transitions in disordered NbTiN films

BKT transition observed in magnetic and electric properties of YBa2Cu3O7−δ single crystals

Ultrahigh-inductance materials from spinodal decomposition

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