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Diao, Zhu; Campanini, Donato; Fang, Lei; Kwok, W. K.; Welp, U.; Rydh, Andreas

doi:10.1103/physrevb.93.014509

Cited by 18 publications

(18 citation statements)

References 30 publications

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“…The magnetic fluxes induced by the loop currents should be directly observable with recently developed scanning probes 36,37 , and the sudden disappearance of the paramagnetic response should be observable with nano-SQUIDS and possibly in penetration-depth experiments. Furthermore, the large jump in heat capacity at the phase transition should be observable with nanocalorimetry 48 .…”

Section: Discussionmentioning

confidence: 99%

Broken translational symmetry at edges of high-temperature superconductors

et al. 2018

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Flat bands of zero-energy states at the edges of quantum materials have a topological origin. However, their presence is energetically unfavorable. If there is a mechanism to shift the band to finite energies, a phase transition can occur. Here we study high-temperature superconductors hosting flat bands of midgap Andreev surface states. In a second-order phase transition at roughly a fifth of the superconducting transition temperature, time-reversal symmetry and continuous translational symmetry along the edge are spontaneously broken. In an external magnetic field, only translational symmetry is broken. We identify the order parameter as the superfluid momentum ps, that forms a planar vector field with defects, including edge sources and sinks. The critical points of the vector field satisfy a generalized Poincaré-Hopf theorem, relating the sum of Poincaré indices to the Euler characteristic of the system.

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Section: Discussionmentioning

confidence: 99%

Broken translational symmetry at edges of high-temperature superconductors

et al. 2018

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“…(B2) in Appendix B. The value of z −1 observed by experiments is z −1 ∼ 3-5 in EuFe 2 As 2 [43] and BaFe 2 As 2 [44][45][46]. Using the experimental z −1 , we can understand S y − S x ∼ 20μV/K observed in Eu122 near T N [17].…”

Section: Resultsmentioning

confidence: 96%

In-plane anisotropy of transport coefficients in electronic nematic states: Universal origin of nematicity in Fe-based superconductors

Onari

Kontani

2017

Phys. Rev. B

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The origin of the electronic nematicity and its remarkable material dependence are famous longstanding unsolved issues in Fe-based superconductors. To attack these issues, we focus on the in-plane anisotropy of the resistivity: In the nematic state in FeSe, the relation ρ x > ρ y holds, where ρ x(y) is the resistivity along the longer (shorter) Fe-Fe axis. In contrast, the opposite anisotropy ρ x < ρ y is realized in other undoped Fe-based superconductors. Such nontrivial material dependence is naturally explained in terms of the strongly orbitaldependent inelastic quasiparticle scattering realized in the orbital-ordered state. The opposite anisotropy between FeSe (ρ x > ρ y ) and other undoped compounds (ρ x < ρ y ) reflects the difference in the number of hole pockets. We also explain the large in-plane anisotropy of the thermoelectric power in the nematic state.

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“…An isovalent phosphorus substitution of arsenic in the BaFe 2 (As 1−x P x ) 2 compound accompanied by the appearance of superconductivity [6][7][8][9][10][11] can be regarded as a kind of chemical pressure. Importantly, a prominent experiment on London penetration depth in this compound observed a sharp peak in the vicinity of the disappearance of magnetic order at zero temperature, suggesting the presence of quantum critical point (QCP) 12 and attracting widespread research attention [13][14][15][16][17] .…”

Section: Introductionmentioning

confidence: 97%

Anomalous sharp peak in the London penetration depth induced by the nodeless-to-nodal superconducting transition in BaFe$_2$(As$_{1-x}$P$_x$)$_2$

Huang,

Li,

Gao

et al. 2019

Preprint

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The issue of whether the quantum critical point (QCP) is hidden inside unconventional superconductors is a matter of hot debate. Although a prominent experiment on London penetration depth has demonstrated the existence of the QCP in the isovalent-doped iron-based superconductor BaFe 2 (As 1−x P x ) 2 , with the observation of a sharp peak in the penetration depth in the vicinity of the disappearance of magnetic order at zero temperature, the nature of such an emerging QCP remains unclear. Here, we provide a unique picture to understand well the phenomena of the QCP based on the framework of linear response theory. Evidence from the density of states and superfluid density calculations suggests the nodeless-to-nodal pairing transition accompanied the appearance of a sharp peak in the penetration depth in BaFe 2 (As 1−x P x ) 2 . Such a pairing transition originates from the three-dimensional electronic properties with a strong interlayer superconducting pairing. This finding provides a significant insight into the understanding of the QCP observed in experiment in BaFe 2 (As 1−x P x ) 2 .

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Microscopic parameters from high-resolution specific heat measurements on superoptimally substitutedBaFe2(As1−xPx)2

Cited by 18 publications

References 30 publications

Broken translational symmetry at edges of high-temperature superconductors

Broken translational symmetry at edges of high-temperature superconductors

In-plane anisotropy of transport coefficients in electronic nematic states: Universal origin of nematicity in Fe-based superconductors

Anomalous sharp peak in the London penetration depth induced by the nodeless-to-nodal superconducting transition in BaFe$_2$(As$_{1-x}$P$_x$)$_2$

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