Anisotropic quasiparticle coherence in nematic BaFe2As2 studied with strain-dependent ARPES

H. Pfau; S. D. Chen; M. Hashimoto; N. Gauthier; C. R. Rotundu; J. C. Palmstrom; I. R. Fisher; S. K. Mo; Z. X. Shen; D. Lu

doi:10.1103/PhysRevB.103.165136

Anisotropic quasiparticle coherence in nematic BaFe2As2 studied with strain-dependent ARPES

H. Pfau, S. D. Chen, M. Hashimoto, N. Gauthier, C. R. Rotundu, J. C. Palmstrom, I. R. Fisher, S. K. Mo, Z. X. Shen, D. Lu

Physics

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

The hallmark of nematic order in iron-based superconductors is a resistivity anisotropy but it is unclear to which extent quasiparticle dispersions, lifetimes, and coherence contribute. While the lifted degeneracy of the Fe dxz and dyz dispersions has been studied extensively, only little is known about the two other factors. Here, we combine in situ strain tuning with ARPES and study the nematic response of the spectral weight in BaFe2As2. The symmetry analysis of the ARPES spectra demonstrates that the dxz band gains quasiparticle spectral weight compared to the dyz band for negative antisymmetric strain Δϵyy suggesting the same response inside the nematic phase. Our results are compatible with a different coherence of the dxz and dyz orbital within a Hund's metal picture. We also discuss the influence of orbital mixing.

Original language	English (US)
Article number	165136
Journal	Physical Review B
Volume	103
Issue number	16
DOIs	https://doi.org/10.1103/PhysRevB.103.165136
State	Published - Apr 26 2021

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Access to Document

10.1103/PhysRevB.103.165136

Cite this

@article{5c2a3c4ed7a04192a48225de69933fd7,

title = "Anisotropic quasiparticle coherence in nematic BaFe2As2 studied with strain-dependent ARPES",

abstract = "The hallmark of nematic order in iron-based superconductors is a resistivity anisotropy but it is unclear to which extent quasiparticle dispersions, lifetimes, and coherence contribute. While the lifted degeneracy of the Fe dxz and dyz dispersions has been studied extensively, only little is known about the two other factors. Here, we combine in situ strain tuning with ARPES and study the nematic response of the spectral weight in BaFe2As2. The symmetry analysis of the ARPES spectra demonstrates that the dxz band gains quasiparticle spectral weight compared to the dyz band for negative antisymmetric strain Δϵyy suggesting the same response inside the nematic phase. Our results are compatible with a different coherence of the dxz and dyz orbital within a Hund's metal picture. We also discuss the influence of orbital mixing.",

author = "H. Pfau and Chen, {S. D.} and M. Hashimoto and N. Gauthier and Rotundu, {C. R.} and Palmstrom, {J. C.} and Fisher, {I. R.} and Mo, {S. K.} and Shen, {Z. X.} and D. Lu",

note = "Publisher Copyright: {\textcopyright} 2021 American Physical Society.",

year = "2021",

month = apr,

day = "26",

doi = "10.1103/PhysRevB.103.165136",

language = "English (US)",

volume = "103",

journal = "Physical Review B",

issn = "2469-9950",

publisher = "American Physical Society",

number = "16",

}

TY - JOUR

T1 - Anisotropic quasiparticle coherence in nematic BaFe2As2 studied with strain-dependent ARPES

AU - Pfau, H.

AU - Chen, S. D.

AU - Hashimoto, M.

AU - Gauthier, N.

AU - Rotundu, C. R.

AU - Palmstrom, J. C.

AU - Fisher, I. R.

AU - Mo, S. K.

AU - Shen, Z. X.

AU - Lu, D.

PY - 2021/4/26

Y1 - 2021/4/26

N2 - The hallmark of nematic order in iron-based superconductors is a resistivity anisotropy but it is unclear to which extent quasiparticle dispersions, lifetimes, and coherence contribute. While the lifted degeneracy of the Fe dxz and dyz dispersions has been studied extensively, only little is known about the two other factors. Here, we combine in situ strain tuning with ARPES and study the nematic response of the spectral weight in BaFe2As2. The symmetry analysis of the ARPES spectra demonstrates that the dxz band gains quasiparticle spectral weight compared to the dyz band for negative antisymmetric strain Δϵyy suggesting the same response inside the nematic phase. Our results are compatible with a different coherence of the dxz and dyz orbital within a Hund's metal picture. We also discuss the influence of orbital mixing.

AB - The hallmark of nematic order in iron-based superconductors is a resistivity anisotropy but it is unclear to which extent quasiparticle dispersions, lifetimes, and coherence contribute. While the lifted degeneracy of the Fe dxz and dyz dispersions has been studied extensively, only little is known about the two other factors. Here, we combine in situ strain tuning with ARPES and study the nematic response of the spectral weight in BaFe2As2. The symmetry analysis of the ARPES spectra demonstrates that the dxz band gains quasiparticle spectral weight compared to the dyz band for negative antisymmetric strain Δϵyy suggesting the same response inside the nematic phase. Our results are compatible with a different coherence of the dxz and dyz orbital within a Hund's metal picture. We also discuss the influence of orbital mixing.

UR - http://www.scopus.com/inward/record.url?scp=85105515728&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85105515728&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.103.165136

DO - 10.1103/PhysRevB.103.165136

M3 - Article

AN - SCOPUS:85105515728

SN - 2469-9950

VL - 103

JO - Physical Review B

JF - Physical Review B

IS - 16

M1 - 165136

ER -

Anisotropic quasiparticle coherence in nematic BaFe2As2 studied with strain-dependent ARPES

Abstract

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Fingerprint

Cite this