Tuning orbital-selective correlations in superconducting<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Rb</mml:mi><mml:mrow><mml:mn>0.75</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi>Fe</mml:mi><mml:mrow><mml:mn>1.6</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi>Se</mml:mi><mml:mrow><mml:mn>2</mml:mn><mml:mo>−</mml:mo><mml:mi>z</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant="normal">S</mml:mi><mml:mi>z</mml:mi></mml:msub></mml:mrow></mml:math>

Wang, Zhe; Tsurkan, V.; Schmidt, Michael; Loidl, A.

doi:10.1103/physrevb.93.104522

Cited by 6 publications

(12 citation statements)

References 39 publications

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“…Obviously such a model could provide a rationale for why the δ-band, predominantly associated with the d xy orbital, has weak visibility by ARPES [40,41] and BQPI, and could also account similarly for a low energy spin-susceptibility that is dominant at q = (π/a Fe , 0) consistent with INS data [123]. By projecting this form of orbital selective pairing interaction onto the Fermi surfaces of FeSe, the gap functions can be predicted by solving the linearized gap equation (Ref.…”

Section: Summary Of Resultsmentioning

confidence: 99%

“…In the following, I will focus on possible STM experiments, and refer the interested reader to the literature for other experimental techniques [37,[39][40][41].…”

Section: Discussionmentioning

confidence: 99%

“…FeSe while strongly nematic, does not form an ordered magnetic state and is instead hypothesized to be a quantum paramagnet due to quantum fluctuations of frustrated spin configurations [33,35,36]; (ii) strong orbital selectivity [23,37] of band structure characteristics is reported in FeSe [38][39][40][41]; (iii) a monolayer of FeSe grown upon a S rT iO 3 substrate produces the highest T C of all iron-based superconductors [9][10][11][12]. and as a function of applied pressure.…”

Section: Fesementioning

confidence: 99%

“…Such phenomena, although important to understanding and achieving higher temperature superconductivity in cor-related multi-orbital superconductors [23,[37][38][39][40][41], have remained largely unexplored because orbital selective Cooper pairing has never been detected in any material. For these reasons, it is essential to understand the electronic structure and superconductivity of FeSe at a microscopic level.…”

Section: -Symmetric Superconductivitymentioning

confidence: 99%

“…The existence of strong orbital selective correlations [39][40][41] and the detection of such a highly anisotropic gap [69] engineers a unique opportunity to explore the influence of orbital selective correlations on superconductivity and possibly orbital selective superconductivity itself. Such phenomena, although important to understanding and achieving higher temperature superconductivity in cor-related multi-orbital superconductors [23,[37][38][39][40][41], have remained largely unexplored because orbital selective Cooper pairing has never been detected in any material.…”

Section: -Symmetric Superconductivitymentioning

confidence: 99%

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Discovery of orbital-selective Cooper pairing in FeSe

Sprau

Kostin

Kreisel

et al. 2017

Science

379

494

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FeSe is the focus of intense research interest because of its unusual non-magnetic nematic state and because it forms the basis for achieving the highest critical temperatures of any iron-based superconductor. However, its Cooper pairing mechanism has not been determined because an accurate knowledge of the momentum-space structure of superconducting energy gaps ∆ i ( k) on the different electron-bands E i ( k) does not exist. Here we use Bogoliubov quasiparticle interference (BQPI) imaging to determine the coherent Fermi surface geometry of the α-and ε-bands surrounding the Γ = (0, 0) and X = (π/a Fe , 0) points of FeSe, and to measure their superconducting energy gaps ∆ α ( k) and ∆ ε ( k).We show directly that both gaps are extremely anisotropic but nodeless, and are aligned along orthogonal crystal axes. Moreover, by implementing a novel technique we demonstrate the sign change between ∆ α ( k) and ∆ ε ( k). This complex configuration of ∆ α ( k) and ∆ ε ( k), which was unanticipated within pairing theories for FeSe, reveals a unique form of superconductivity based on orbital selective Cooper pairing of electrons from the d yz orbitals of iron atoms. This new paradigm of orbital selectivity may be pivotal to understanding the microscopic interplay of quantum paramagnetism, nematicity and high temperature superconductivity. BIOGRAPHICAL SKETCHPeter Oliver Sprau was born on June 13th 1986 in the small town of Kirchheimbolanden, Germany, where he completed both his primary and secondary education. Long before he was a physicist, Peter was an active member of the track and field team in his school and a local club, even going on to compete in the dash and relay event on the state and federal youth level. Upon finishing school, he fulfilled his civic duty and carried out his alternative civilian service in the hospital in Kirchheimbolanden. While Peter's academic interests were diverse, including not just science but also Latin and history, his natural curiosity about the world finally urged him to pursue a higher education in physics. Mistakes. Make glorious, amazing mistakes. Make mistakes nobody's ever made before. Don't freeze, don't stop, don't worry that it isn't good enough, or it isn't perfect, whatever it is: art, or love, or work or family or life.Whatever it is you're scared of doing, Do it. Make your mistakes, next year and forever." I also want to acknowledge in no specific order the following people for useful discussions throughout my PhD:

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Section: Summary Of Resultsmentioning

confidence: 99%

“…In the following, I will focus on possible STM experiments, and refer the interested reader to the literature for other experimental techniques [37,[39][40][41].…”

Section: Discussionmentioning

confidence: 99%

Section: Fesementioning

confidence: 99%

Section: -Symmetric Superconductivitymentioning

confidence: 99%

Section: -Symmetric Superconductivitymentioning

confidence: 99%

See 3 more Smart Citations

Discovery of orbital-selective Cooper pairing in FeSe

Sprau

Kostin

Kreisel

et al. 2017

Science

379

494

View full text Add to dashboard Cite

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Structure, superconductivity, and magnetism in Rb1−xFe1.6Se2−zSz
Croitori
¹
,
Филиппова
²
,
Kravtsov
³

et al. 2020
Phys. Rev. B
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We report on single-crystal growth, stoichiometry, structure and basic characterization of Rb 1−x Fe 2−y Se 2−z S z crystals where Se is substituted by S. The temperature and magnetic field dependence of magnetic and thermodynamic properties of all samples was studied by differential-scanning calorimetry, magnetic susceptibility, electrical conductivity, and specific heat. The experimental results are discussed within a T -z phase diagram, which includes vacancy-ordered and vacancy-disordered antiferromagnetic (AFM), superconducting (SC), and nonsuperconducting phases. The structural study reveals change in the local environment of the Fe tetrahedrons depending on substitution: a reduction of the Fe-Fe and Fe-Ch(chalcogen) bond lengths and a tendency for six out-of eight bond angles to approach values realizing a regular tetrahedron and hence, suggesting a reduction of structural distortions with substitution. With increasing substitution, a nonmonotonic decrease of the superconducting transition temperature T c was observed; the SC state disappears at a substitution level above z = 1.2. The SC state coexists with the AFM state that persists in all samples independent of substitution. The transition temperature into the AFM state, T N , decreases gradually with increasing substitution indicating a weakening of the AFM interactions. The AFM phase exhibits an iron-vacancy-ordered structure below the structural transition temperature T s . T s shows a nonmonotonous variation: a decrease with increasing z up to 1.3, followed by an increase on further increasing z. The electronic specific heat reveals a significant reduction of the anomaly at the SC transition temperature indicating a reduction of the density of states at the Fermi energy and a weakening of the electronic correlations that can explain the suppression of the superconductivity with substitution.

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