Lifshitz Transitions Induced by Magnetic Field

Ptok, Andrzej

doi:10.12693/aphyspola.135.55

Cited by 5 publications

(4 citation statements)

References 59 publications

(103 reference statements)

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“…Thus, the orbit associated with the hole band at the Γ point could be a prime candidate for the observed disappearance of a significant frequency in quantum oscillations. Other scenarios could invoke magnetic field-induced Lifshitz transitions affecting the bands with very small Fermi energies, such as the inner hole and electron bands, that are comparable to the Zeeman energy (3-4 meV) [107]. Multi-band interference effects as well as oscillations of the chemical potential could be considered as other potential theoretical avenues to understand these effects in magnetic fields [108].…”

Section: Evolution Of Fermi Surface Areas Of Fese1−xsxmentioning

confidence: 99%

Electronic nematic states tuned by isoelectronic substitution in bulk FeSe1-xSx

Coldea

2020

Preprint

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Isoelectronic substitution is an ideal tuning parameter to alter electronic states and correlations in iron-based superconductors. As this substitution takes place outside the conducting Fe planes, the electronic behaviour is less affected by the impurity scattering experimentally and relevant key electronic parameters can be accessed. In this short review, I present the experimental progress made in understanding the electronic behaviour of the nematic electronic superconductors, FeSe1−xSx. A direct signature of the nematic electronic state is in-plane anisotropic distortion of the Fermi surface triggered by orbital ordering effects and electronic interactions that result in multi-band shifts detected by ARPES. Upon sulphur substitution, the electronic correlations and the Fermi velocities decrease in the tetragonal phase. Quantum oscillations are observed for the whole series in ultra-high magnetic fields and show a complex spectra due to the presence of many small orbits. Effective masses associated to the largest orbit display non-divergent behaviour at the nematic end point (x ∼ 0.175( 5)), as opposed to critical spin-fluctuations in other iron pnictides. Magnetotransport behaviour has a strong deviation from the Fermi liquid behaviour and linear T resistivity is detected at low temperatures inside the nematic phase, where scattering from low energy spin-fluctuations are likely to be present. The superconductivity is not enhanced in FeSe1−xSx and there are no divergent electronic correlations at the nematic end point. These manifestations indicate a strong coupling with the lattice in FeSe1−xSx and a pairing mechanism likely promoted by spin fluctuations.

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Section: Evolution Of Fermi Surface Areas Of Fese1−xsxmentioning

confidence: 99%

Electronic nematic states tuned by isoelectronic substitution in bulk FeSe1-xSx

Coldea

2020

Preprint

View full text Add to dashboard Cite

show abstract

“…Thus, the orbit associated with the hole band at the Γ point could be a prime candidate for the observed disappearance of a significant frequency in quantum oscillations. Other scenarios could invoke magnetic field-induced Lifshitz transitions affecting the bands with very small Fermi energies, such as the inner hole and electron bands, that are comparable to the Zeeman energy (3-4 meV) [108]. Multi-band interference effects as well as oscillations of the chemical potential could be considered as other potential theoretical avenues to understand these effects in magnetic fields [109].…”

Section: Evolution Of Fermi Surface Areas Of Fese 1−x S Xmentioning

confidence: 99%

Electronic Nematic States Tuned by Isoelectronic Substitution in Bulk FeSe1−xSx

Coldea

2021

Front. Phys.

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Isoelectronic substitution is an ideal tuning parameter to alter electronic states and correlations in iron-based superconductors. As this substitution takes place outside the conducting Fe planes, the electronic behaviour is less affected by the impurity scattering experimentally and relevant key electronic parameters can be accessed. In this short review, I present the experimental progress made in understanding the electronic behaviour of the nematic electronic superconductors, FeSe1−xSx. A direct signature of the nematic electronic state is in-plane anisotropic distortion of the Fermi surface triggered by orbital ordering effects and electronic interactions that result in multi-band shifts detected by ARPES. Upon sulphur substitution, the electronic correlations and the Fermi velocities decrease in the tetragonal phase. Quantum oscillations are observed for the whole series in ultra-high magnetic fields and show a complex spectra due to the presence of many small orbits. Effective masses associated to the largest orbit display non-divergent behaviour at the nematic end point (x ∼ 0.175(5)), as opposed to critical spin-fluctuations in other iron pnictides. Magnetotransport behaviour has a strong deviation from the Fermi liquid behaviour and linear T resistivity is detected at low temperatures inside the nematic phase, where scattering from low energy spin-fluctuations are likely to be present. The superconductivity is not enhanced in FeSe1−xSx and there are no divergent electronic correlations at the nematic end point. These manifestations indicate a strong coupling with the lattice in FeSe1−xSx and a pairing mechanism likely promoted by spin fluctuations.

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“…Between 13.5 and 15 GPa, the topology of the FS alters indicating that the T-cT structural phase transition is accompanied by the Lifshitz transition [54]. Typically, it is generated by doping [14,20,[55][56][57][58][59][60][61] or external magnetic field [62][63][64]. In the case of K122, the Lifshitz transition Fig.…”

Section: Electronic Propertiesmentioning

confidence: 99%

Superconductivity of KFe2As2 Under Pressure: Ab Initio Study of Tetragonal and Collapsed Tetragonal Phases

Ptok

Kapcia

Sternik

et al. 2020

J Supercond Nov Magn

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KFe2As2 is one of the representatives of iron-based superconductors. Many interesting features distinguish this compound from other iron-based superconductors, e.g., a realization of the Pauli limit or an occurrence of the superconducting gap with nodal lines. Moreover, with increasing pressure, the isostructural phase transition from the tetragonal to collapsed tetragonal phase is experimentally observed. We discuss the structural, electronic, and superconducting properties of the KFe2As2 under pressure using the ab initio density functional theory (DFT) methods. We analyze the untypical properties of this superconductor considering, among others, the Fermi surfaces or the dependence of the anion height from the iron layer on the superconducting critical temperature.

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Lifshitz Transitions Induced by Magnetic Field

Cited by 5 publications

References 59 publications

Electronic nematic states tuned by isoelectronic substitution in bulk FeSe1-xSx

Electronic nematic states tuned by isoelectronic substitution in bulk FeSe1-xSx

Electronic Nematic States Tuned by Isoelectronic Substitution in Bulk FeSe1−xSx

Superconductivity of KFe2As2 Under Pressure: Ab Initio Study of Tetragonal and Collapsed Tetragonal Phases

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