Campus Units
Physics and Astronomy, Ames Laboratory
Document Type
Article
Publication Version
Published Version
Publication Date
7-1-2011
Journal or Book Title
Physical Review B
Volume
84
Issue
2
First Page
020509(R)
DOI
10.1103/PhysRevB.84.020509
Abstract
We used angle-resolved photoemission spectroscopy and thermoelectric power to study the poorly explored, highly overdoped side of the phase diagram of Ba(Fe1−xCox)2As2 high-temperature superconductor. Our data demonstrate that several Lifshitz transitions—topological changes of the Fermi surface—occur for large x. The central hole barrel changes to ellipsoids that are centered at Z at x∼0.11 and subsequently disappear around x∼0.2; changes in thermoelectric power occur at similar x values. Tc decreases and goes to zero around x∼0.15—between the two Lifshitz transitions. Beyond x=0.2 the central pocket becomes electron-like and superconductivity does not exist. Our observations reveal the importance of the underlying Fermiology in electron-doped iron arsenides. We speculate that a likely necessary condition for superconductivity in these materials is the presence of the central hole pockets rather than nesting between central and corner pockets.
Copyright Owner
American Physical Society
Copyright Date
2011
Language
en
File Format
application/pdf
Recommended Citation
Liu, Chang; Palczewski, A. D.; Dhaka, R. S.; Konda, Takeshi; Fernandes, R. M.; Mun, E. D.; Hodovanets, H.; Thaler, A. N.; Schmalian, J.; Bud’ko, Sergey L.; Canfield, Paul C.; and Kaminski, Adam, "Importance of the Fermi-surface topology to the superconducting state of the electron-doped pnictide Ba(Fe1-xCox)(2)As-2" (2011). Physics and Astronomy Publications. 666.
https://lib.dr.iastate.edu/physastro_pubs/666
Comments
This article is published as Liu, Chang, A. D. Palczewski, R. S. Dhaka, Takeshi Kondo, R. M. Fernandes, E. D. Mun, H. Hodovanets, A. N. Thaler, J. Schmalian, S. L. Bud’ko, P. C. Canfield, and A. Kaminski. "Importance of the Fermi-surface topology to the superconducting state of the electron-doped pnictide Ba (Fe 1− x Co x) 2 As 2." Physical Review B 84, no. 2 (2011): 020509. DOI: 10.1103/PhysRevB.84.020509. Posted with permission.