Normal-state magnetotransport properties of
                    <i>β</i>
                    -FeSe superconductors

Querales-Flores, José D.; Amigó, M. L.; Nieva, G.; Ventura, C. I.

doi:10.1209/0295-5075/113/17005

Cited by 2 publications

(2 citation statements)

References 42 publications

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“…We consider a twoband system each formed by electrons in the same orbitals possibly hybridized with other states [13,14]. We then add to this twoband problem a new hybridiza tion term that we will vary with the intention of simulating the effects of external and chemical pressure in the electronic structure.…”

Section: Introductionmentioning

confidence: 99%

Tail-like regime and BCS-BEC crossover due to hybridization in a two-band superconductor

Reyes

Continentino

Deus

et al. 2018

J. Phys.: Condens. Matter

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Superconductivity in strongly correlated systems is a remarkable phenomenon that attracts huge interest. The study of this problem is relevant for materials such as the high T oxides, pnictides and heavy fermions. These systems also have in common the existence of electrons of several orbitals that coexist at a common Fermi surface. In this paper we study the effect of pressure, chemical or applied on multi-band superconductivity. Pressure varies the atomic distances and consequently the overlap of the wave-functions in the crystal. This rearranges the electronic structure that we model including a pressure dependent hybridization between the bands. We consider the case of two-dimensional systems in a square lattice with inverted bands. We study the conditions for obtaining a pressure induced superconductor quantum critical point and show that hybridization, i.e. pressure can induce a Bardeen-Cooper-Schrieffer-Bose-Einstein condensation crossover in multi-band systems even for moderate interactions. We found a tail-like superconductor regime and briefly discuss the influence of the symmetry of the order parameter in the results.

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Section: Introductionmentioning

confidence: 99%

Tail-like regime and BCS-BEC crossover due to hybridization in a two-band superconductor

Reyes

Continentino

Deus

et al. 2018

J. Phys.: Condens. Matter

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show abstract

“…It is this aspect of hybridization that we explore in this paper. We consider a two-band system each formed by electrons in the same orbitals possibly hybridized with other states [13,14]. We then add to this two-band problem a new hybridization term that we will vary with the intention of simulating the effects of external and chemical pressure in the electronic structure.…”

Section: Introductionmentioning

confidence: 99%

Pressure induced BEC-BCS crossover in multi-band superconductors

Reyes¹,

Continentino²,

Deus³

et al. 2018

Preprint

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Superconductivity in strongly correlated systems is a remarkable phenomenon that attracts a huge interest. The study of this problem is relevant for materials as the high T c oxides, pnictides and heavy fermions. These systems also have in common the existence of electrons of several orbitals that coexist at a common Fermisurface. In this paper we study the effect of pressure, chemical or applied on multi-band superconductivity. Pressure varies the atomic distances and consequently the overlap of the wave-functions in the crystal. This rearranges the electronic structure that we model including a pressure dependent hybridization between the bands. We consider the case of two-dimensional systems in a square lattice with inverted bands. We study the conditions for obtaining a pressure induced superconductor quantum critical point and show that hybridization, i.e., pressure can induce a BCS-BEC crossover in multiband systems even for moderate interactions. We briefly discuss the influence of the symmetry of the order parameter in the results.

show abstract

Normal-state magnetotransport properties of β -FeSe superconductors

Cited by 2 publications

References 42 publications

Tail-like regime and BCS-BEC crossover due to hybridization in a two-band superconductor

Tail-like regime and BCS-BEC crossover due to hybridization in a two-band superconductor

Pressure induced BEC-BCS crossover in multi-band superconductors

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