Change of the sign of superconducting intraband order parameters induced by interband pair hopping interaction in iron-based high-temperature superconductors

Ptok, Andrzej; Crivelli, Dawid; Kapcia, Konrad Jerzy

doi:10.1088/0953-2048/28/4/045010

Cited by 23 publications

(20 citation statements)

References 71 publications

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“…describing the symmetry of the order parameter is either 1 or cos(k x ) − cos(k y ) for the s-wave and d-wave symmetry, respectively [71][72][73]. Finally, ∆ 0 = 1/N k ĉ −k↓ĉk↑ is the amplitude of the superconducting order parameter, which is determined variationally by minimizing the grand canonical potential, cf.…”

Section: Model and Methodsmentioning

confidence: 99%

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Superconducting monolayer deposited on substrate: Effects of the spin-orbit coupling induced by proximity effects

Ptok

Rodriguez

Kapcia

2018

Phys. Rev. Materials

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The spin-orbit coupling can lead to exotic states of matter and unexpected behavior of the system properties. In this paper, we investigate the influence of spin-orbit coupling induced by proximity effects on a monolayer of superconductor (with s-wave or d-wave pairing) placed on an insulating bulk. We show that the critical temperatures Tc of the superconducting states can be tuned by the spin-orbit coupling both in the case of on-site and inter-site pairing. Moreover, we discuss a possibility of changing the location of the maximal Tc from the half-filling into the underdoped or overdoped regimes.

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Section: Model and Methodsmentioning

confidence: 99%

“…[71,74,75]. Notice that in Hamiltonian (2) we only left terms associated with (extended) BCS-type pairing -the total momentum Q of the Cooper pair is zero: |Q| = 0 [73,[75][76][77]. This assumption is valid only if the SO coupling in the monolayer is induced by proximity effects.…”

Section: Model and Methodsmentioning

confidence: 99%

Superconducting monolayer deposited on substrate: Effects of the spin-orbit coupling induced by proximity effects

Ptok

Rodriguez

Kapcia

2018

Phys. Rev. Materials

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“…The structure factor given by η(k) captures the symmetry of the SOP, related to the effective interaction in real space [26,47]. H ′ SC in band space is the reformulation of the interacting Hamiltonian in orbital space [40] Similarly to the two-band model, the SOP in the band representation can be transformed to orbital one.…”

Section: Model and Theoretical Backgroundmentioning

confidence: 99%

Multiple phase transitions in Pauli-limited iron-based superconductors

Ptok

2015

J. Phys.: Condens. Matter

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Abstract. Specific heat measurements have been successfully used to probe unconventional superconducting phases in one-band heavy-fermion and organic superconductors. We extend the method to study successive phase transitions in multi-band materials such as iron based superconductors. The signatures are multiple peaks in the specific heat, at low temperatures and high magnetic field, which can lead the experimental verification of unconventional superconducting states with non-zero total momentum.

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“…where N is the number of lattice sites and ∆ = Z 2 J N k η k f −k,−σ f k,σ represents the superconducting order parameter for extended s or d-wave symmetries 38,39 , since the strong Coulomb repulsion prevents local s-wave pairing between f -electrons. η k denotes any of the possible pairing symmetries cos k x + cos k y and cos k x − cos k y for s and d waves, respectively.…”

Section: The Modelmentioning

confidence: 99%

Influence of the symmetry of hybridization on the critical temperature of multiband superconductors

et al. 2019

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In this work we study a two-band model of a superconductor in a square lattice. One band is narrow in energy and includes local Coulomb correlations between its quasi-particles. Pairing occurs in this band due to nearest neighbor attractive interactions. Extended s-wave, as well as d-wave symmetries of the superconducting order parameter are considered. The correlated electrons hybridize with those in another, wide conduction band through a k-dependent mixing, with even or odd parity depending on the nature of the orbitals. The many-body problem is treated within a slave-boson approach that has proved adequate to deal with the strong electronic correlations that are assumed here. Since applied pressure changes mostly the ratio between hybridization and bandwidths, we can use this ratio as a control parameter to obtain the phase diagrams of the model. We find that for a wide range of parameters, the critical temperature increases as a function of hybridization (pressure), with a region of first-order transitions. When frustration is introduced it gives rise to a stable superconducting phase. We find that superconductivity can be suppressed for specific values of band-filling due to the Coulomb repulsion. We show how pressure, composition and strength of correlations affect the superconductivity for different symmetries of the order parameter and the hybridization. arXiv:1904.04945v1 [cond-mat.supr-con]

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Change of the sign of superconducting intraband order parameters induced by interband pair hopping interaction in iron-based high-temperature superconductors

Cited by 23 publications

References 71 publications

Superconducting monolayer deposited on substrate: Effects of the spin-orbit coupling induced by proximity effects

Superconducting monolayer deposited on substrate: Effects of the spin-orbit coupling induced by proximity effects

Multiple phase transitions in Pauli-limited iron-based superconductors

Influence of the symmetry of hybridization on the critical temperature of multiband superconductors

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