Local destruction of superconductivity by non-magnetic impurities in mesoscopic iron-based superconductors

Li, Jun; Ji, Min; Schwarz, Tobias; Ke, Xiaoxing; Tendeloo, Gustaaf Van; Yuan, Jie; Pereira, Paulo J.; Huang, Y.; Zhang, Gufei; Feng, Hai L.; Yuan, Ya Hua; Hatano, Takeshi; Kleiner, R.; Koelle, D.; Chibotaru, Liviu F.; Yamaura, Kazunari; Wang, Hua Bing; Wu, Pan; Takayama‐Muromachi, E.; Vanacken, Johan; Moshchalkov, Victor

doi:10.1038/ncomms8614

Cited by 23 publications

(25 citation statements)

References 40 publications

(78 reference statements)

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“…For the sake of convenience, we choose the proper local band parameters to make the valence of Zn close to 1. With this assumption, we are able to account for the suppressions of SC by Zn impurities in both electron-and hole-doped BaFe 2 As 2 with and without the SDW order as measured by experiments [14][15][16] using the same set of local band parameters.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

“…First, we focus on single substituted-Zn ion at the center of lattice site I m = (14,14) at two different doping levels: n = 1.90 and n = 2.05. Fig.…”

Section: Superconductivity Suppression With the Increase Of Zinc Imentioning

confidence: 99%

“…First, we focus on the single impurity effect on the underdoped systems. We put our single substituted-Zn at the center I m = (14,14). According to the phase diagram ( Fig.…”

Section: Sdw Suppression With the Existence Of Zinc Impuritiesmentioning

confidence: 99%

“…Most recently, Li et al report 14 that SC can hardly survive with 3% Zn substitutions in the hole-doped Ba 0.5 K 0.5 Fe 2 As 2 . They also show that the local destruction of SC may provide evidence for s-wave pairing symmetry.…”

Section: Introductionmentioning

confidence: 99%

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Effects of single- and multi-substituted Zn ions in doped 122-type iron-based superconductors

Zhao¹,

Li²,

Li³

et al. 2016

Phys. Rev. B

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Recent experiments on Zn-substituted 122-type iron-based superconductors (FeSCs) at electron-and holedoped region provide us with a testing ground for understanding the effect of Zn impurities in these systems. Our first-principle calculations of the electronic structure reveal that the Zn 3d orbitals are far below the Fermi level and chemically inactive, while the Zn 4s-orbital is partially occupied and its wave function overlapping with those 3d-orbitals of neighboring Fe-ions. This suggests that the impurity effect is originating in the Zn 4s-orbital, not its 3d-orbitals. Employing a phenomenological two-orbital lattice model for 122-FeSCs and the self-consistent Bogoliubov-de Gennes equations, we study how the Zn-impurities suppress the superconductivity in electron-and hole-doped compounds. Our obtained results qualitatively agree with the experimental measurements.

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Section: Conclusion and Discussionmentioning

confidence: 99%

“…First, we focus on single substituted-Zn ion at the center of lattice site I m = (14,14) at two different doping levels: n = 1.90 and n = 2.05. Fig.…”

Section: Superconductivity Suppression With the Increase Of Zinc Imentioning

confidence: 99%

“…First, we focus on the single impurity effect on the underdoped systems. We put our single substituted-Zn at the center I m = (14,14). According to the phase diagram ( Fig.…”

Section: Sdw Suppression With the Existence Of Zinc Impuritiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effects of single- and multi-substituted Zn ions in doped 122-type iron-based superconductors

Zhao¹,

Li²,

Li³

et al. 2016

Phys. Rev. B

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“…For the ordinary SC wire supplemented with impurities we also concentrate our discussion on representative points in the nontopological parameter (phase) space. We keep the time-reversal invariant bulk superconductor unchanged by setting D = D = 0.1, although it has also been reported that impurities may suppress or even destroy superconductivity locally [71][72][73][74]. For the ordinary SC we have V Z =0 but in order to introduce magnetic impurities we set 1 V 0 Z , and the energy of these in-gap states may be tuned close to zero by varyingṼ Z .…”

Section: Transient Signature Of the Mzmmentioning

confidence: 99%

Distinguishing Majorana zero modes from impurity states through time-resolved transport

et al. 2019

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We study time-resolved charge transport in a superconducting nanowire using time-dependent Landauer-Büttiker theory. We find that the steady-state Majorana zero-bias conductance peak emerges transiently accompanied by characteristic oscillations after a bias-voltage quench. These oscillations are suppressed for trivial impurity states (IS) that otherwise show a similar steady-state signal as the Majorana zero mode (MZM). In addition, we find that Andreev bound states or quasi-Majorana states (QMS) in the topologically trivial bulk phase can give rise to a zero-bias conductance peak, also retaining the transient properties of the MZM. Our results imply that (1) time-resolved transport may be used as a probe to distinguish between the topological MZM and trivial IS; and (2) the QMS mimic the transient signatures of the topological MZMs.

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Thermodynamic Parameters of Single‐ or Multi‐Band Superconductors Derived from Self‐Field Critical Currents

2017

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Key questions for any superconductor include: what is its maximum dissipation-free electrical current (its 'critical current') and can this be used to extract fundamental thermodynamic parameters? Present models focus on depinning of magnetic vortices and implicate materials engineering to maximise pinning performance. But recently we showed that the self-field critical current for thin films is a universal property, independent of microstructure, controlled only by the penetration depth. Here we generalise this observation to include thin films, wires or nanowires of singleor multi-band s-wave and d-wave superconductors. Using extended BCS equations we consider dissipation-free self-field transport currents as London-Meissner currents, avoiding the concept of pinning altogether. We find quite generally, for type I or type II superconductors, the current is limited by the relevant critical field divided by the penetration depth. Our fits to 64 available data sets, from zinc nanowires to compressed sulphur hydride with critical temperatures of 0.65 to 203 K, respectively, are excellent. Extracted London penetration depths, superconducting energy gaps and specific heat jumps agree well with reported bulk values. For multiband or multiphase samples we accurately recover individual band contributions and phase fractions.

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Local destruction of superconductivity by non-magnetic impurities in mesoscopic iron-based superconductors

Cited by 23 publications

References 40 publications

Effects of single- and multi-substituted Zn ions in doped 122-type iron-based superconductors

Effects of single- and multi-substituted Zn ions in doped 122-type iron-based superconductors

Distinguishing Majorana zero modes from impurity states through time-resolved transport

Thermodynamic Parameters of Single‐ or Multi‐Band Superconductors Derived from Self‐Field Critical Currents

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