Electronic properties of iron arsenic high temperature superconductors revealed by angle resolved photoemission spectroscopy (ARPES)
Chang Liu
(1, 2)
,
Takeshi Kondo
(1, 2)
,
A.D. Palczewski
(1, 2)
,
G.D. Samolyuk
(1, 2)
,
Y. Lee
(1, 2)
,
M.E. Tillman
(1, 2)
,
Ni Ni
(2, 1)
,
E.D. Mun
(1, 2)
,
R. Gordon
(1, 2)
,
A.F. Santander-Syro
(3, 4)
,
S.L. Bud’ko
(1, 2)
,
J.L. Mcchesney
(5)
,
E. Rotenberg
(5)
,
A.V. Fedorov
(5)
,
T. Valla
(6)
,
O. Copie
(7)
,
M.A. Tanatar
(1, 2)
,
C. Martin
(1, 2)
,
B.N. Harmon
(1, 2)
,
P.C. Canfield
(2, 1)
,
R. Prozorov
(1, 2)
,
J. Schmalian
(1, 2)
,
A. Kaminski
(1, 2)
1
Ames Laboratory [Ames, USA]
2 Department of Physics and Astronomy [Ames, Iowa]
3 Laboratoire Photons Et Matière
4 LPS - Laboratoire de Physique des Solides
5 LBNL - Lawrence Berkeley National Laboratory [Berkeley]
6 BNL - Brookhaven National Laboratory [Upton, NY]
7 Laboratoire Albert Fert (ex-UMPhy Unité mixte de physique CNRS/Thales)
2 Department of Physics and Astronomy [Ames, Iowa]
3 Laboratoire Photons Et Matière
4 LPS - Laboratoire de Physique des Solides
5 LBNL - Lawrence Berkeley National Laboratory [Berkeley]
6 BNL - Brookhaven National Laboratory [Upton, NY]
7 Laboratoire Albert Fert (ex-UMPhy Unité mixte de physique CNRS/Thales)
Chang Liu
- Fonction : Auteur
- PersonId : 773580
- ORCID : 0000-0002-6618-8144
Ni Ni
- Fonction : Auteur
- PersonId : 863295
O. Copie
- Fonction : Auteur
- PersonId : 11955
- IdHAL : olivier-copie
- ORCID : 0000-0002-4261-433X
- IdRef : 147024935
Résumé
We present an overview of the electronic properties of iron arsenic high temperature superconductors with emphasis on low energy band dispersion, Fermi surface and superconducting gap. ARPES data is compared with full-potential linearized plane wave (FLAPW) calculations. We focus on single layer NdFeAsO0.9F0.1 (R1111) and two layer Ba1−xKxFe2As2 (B122) compounds. We find general similarities between experimental data and calculations in terms of character of Fermi surface pockets, and overall band dispersion. We also find a number of differences in details of the shape and size of the Fermi surfaces as well as the exact energy location of the bands, which indicate that magnetic interaction and ordering significantly affects the electronic properties of these materials. The Fermi surface consists of several hole pockets centered at Γ and electron pockets located in zone corners. The size and shape of the Fermi surface changes significantly with doping. Emergence of a coherent peak below the critical temperature Tc and diminished spectral weight at the chemical potential above Tc closely resembles the spectral characteristics of the cuprates, however the nodeless superconducting gap clearly excludes the possibility of d-wave order parameter. Instead it points to s-wave or extended s-wave symmetry of the order parameter.