Fermi-Surface Shrinking and Interband Coupling in Iron-Based Pnictides

Ortenzi, Luciano; Cappelluti, E.; Benfatto, Lara; Pietronero, L.

doi:10.1103/physrevlett.103.046404

Cited by 122 publications

(158 citation statements)

References 42 publications

(63 reference statements)

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“…Shrinking of the electronic sheets was also found approaching the maximum T c in BaFe 2 (As 1−x P x ) 2 from quantum oscillations measurements (Shishido et al 2010) and also in BaFe 1−x Co x As 2 from ARPES studies (Brouet et al 2009). This tendency towards shrinking of the Fermi surface sheets in relation to the band structure calculations is not caused by simple band renormalization effects and seems to be a more general feature of iron pnictides, reflecting the domination of the interband interactions over interband ones, and/or the important role of spin fluctuations which may also be responsible for the pairing mechanism (Ortenzi et al 2009). …”

Section: (B) Quasi-three-dimensional 122 Systemsmentioning

confidence: 88%

Quantum oscillations probe the normal electronic states of novel superconductors

Coldea

2010

Phil. Trans. R. Soc. A.

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In 2008, new classes of high-temperature superconductors containing iron have been discovered. These iron pnictides offer a new area of exploration and understanding of superconductivity. Quantum oscillations is a bulk probe that allows us to map out the full Fermi surface of a superconducting system in its normal metallic state. These oscillations are determined by the Landau quantization in high magnetic fields and are usually observed at very low temperatures and in very clean samples. By knowing the exact nature of the quasi-particles in the normal state and the degree of electronic correlations, one can simplify and restrict theoretical models required to understand the pairing mechanism in superconductors. I will discuss the current understanding of the Fermi surface studies in iron-based superconductors as determined from quantum oscillations.

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Section: (B) Quasi-three-dimensional 122 Systemsmentioning

confidence: 88%

Quantum oscillations probe the normal electronic states of novel superconductors

Coldea

2010

Phil. Trans. R. Soc. A.

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“…This very large shrinking in Co8, almost absent in LiFeAs, is an intriguing feature that should be further explored. It was assigned by Ortenzi et al to interband interactions mediated by spin fluctuations [35] and could then suggest a different role of such fluctuations in the two compounds.…”

Section: Three Dimensional Dispersionmentioning

confidence: 95%

ARPES view of orbitally resolved quasiparticle lifetimes in iron pnictides

et al. 2016

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We study with ARPES the renormalization and quasiparticle lifetimes of the dxy and dxz/dyz orbitals in two iron pnictides, LiFeAs and Ba(Fe0.92Co0.08)2As2 [e.g. Co8]. We find that both quantities depend on orbital character rather than on the position on the Fermi Surface (for example hole or electron pocket). In LiFeAs, the renormalizations are larger for dxy, while they are similar on both types of orbitals in Co8. The most salient feature, which proved robust against all the ARPES caveats we could think of, is that the lifetimes for dxy exhibit a markedly different behavior than those for dxz/dyz. They have smaller values near EF and exhibit larger ω and temperature dependences. While the behavior of dxy is compatible with a Fermi liquid description, it is not the case for dxz/dyz. This situation should have important consequences for the physics of iron pnictides, which have not been considered up to now. More generally, it raises interesting questions on how a Fermi liquid regime can be established in a multiband system with small effective bandwidths.

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“…A semi quantitative model of the electron / hole pocket shrinking of the quasinested electron-hole Fermi surfaces of iron-pnictides has been suggested by Ortenzi et al [48]. Here scattering caused by coupling of the itinerant electrons to a bosonic spin fluctuation mode (assumed to be Einstein-like) causes both electron and hole pockets to shrink and also the effective mass (and T c ) to increase.…”

Section: Lafepomentioning

confidence: 99%

Quantum oscillation studies of the Fermi surface of iron-pnictide superconductors

Carrington

2011

Rep. Prog. Phys.

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Abstract. This paper reviews quantum oscillation studies of iron-pnictide superconductors and related materials. These measurements give unique information regarding the full three dimensional topology of the Fermi surfaces and the renormalisation of the quasi-particle masses. The review will cover measurements of the 122 arsenide end members, XFe 2 As 2 (X = Ba, Sr, Ca) which have a spin density wave ground state, but will concentrate on the phosphide end members (LaFePO and XFe 2 P 2 ) which have a paramagnetic ground state and a Fermi surface topology which is similar to the higher T c superconducting iron-pnictides. All three of the 122 phosphides become superconducting when P is partially substituted by As, and for the BaFe 2 (As 1−x P x ) 2 series de Haas-van Alphen oscillations are observable for 0.42 ≤ x ≤ 1 with T c up to 25 K. The results show the changes in the Fermi surface topology and the increase in the mass renormalisation as the correlations which induce superconductivity develop.

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Fermi-Surface Shrinking and Interband Coupling in Iron-Based Pnictides

Cited by 122 publications

References 42 publications

Quantum oscillations probe the normal electronic states of novel superconductors

Quantum oscillations probe the normal electronic states of novel superconductors

ARPES view of orbitally resolved quasiparticle lifetimes in iron pnictides

Quantum oscillation studies of the Fermi surface of iron-pnictide superconductors

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