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Title: Importance of the Fermi-surface topology to the superconducting state of the electron-doped pnictide Ba(Fe 1-xCo x)₂As₂

Abstract

We used angle-resolved photoemission spectroscopy and thermoelectric power to study the poorly explored, highly overdoped side of the phase diagram of Ba(Fe 1-xCo x)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. T c 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.

Authors:
; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1100394
Resource Type:
Publisher's Accepted Manuscript
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Volume: 84 Journal Issue: 2; Journal ID: ISSN 1098-0121
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English

Citation Formats

Liu, Chang, Palczewski, A. D., Dhaka, R. S., Kondo, Takeshi, Fernandes, R. M., Mun, E. D., Hodovanets, H., Thaler, A. N., Schmalian, J., Bud’ko, S. L., Canfield, P. C., and Kaminski, A. Importance of the Fermi-surface topology to the superconducting state of the electron-doped pnictide Ba(Fe1-xCox)₂As₂. United States: N. p., 2011. Web. doi:10.1103/PhysRevB.84.020509.
Liu, Chang, Palczewski, A. D., Dhaka, R. S., Kondo, Takeshi, Fernandes, R. M., Mun, E. D., Hodovanets, H., Thaler, A. N., Schmalian, J., Bud’ko, S. L., Canfield, P. C., & Kaminski, A. Importance of the Fermi-surface topology to the superconducting state of the electron-doped pnictide Ba(Fe1-xCox)₂As₂. United States. doi:10.1103/PhysRevB.84.020509.
Liu, Chang, Palczewski, A. D., Dhaka, R. S., Kondo, Takeshi, Fernandes, R. M., Mun, E. D., Hodovanets, H., Thaler, A. N., Schmalian, J., Bud’ko, S. L., Canfield, P. C., and Kaminski, A. Mon . "Importance of the Fermi-surface topology to the superconducting state of the electron-doped pnictide Ba(Fe1-xCox)₂As₂". United States. doi:10.1103/PhysRevB.84.020509.
@article{osti_1100394,
title = {Importance of the Fermi-surface topology to the superconducting state of the electron-doped pnictide Ba(Fe1-xCox)₂As₂},
author = {Liu, Chang and Palczewski, A. D. and Dhaka, R. S. and Kondo, Takeshi and Fernandes, R. M. and Mun, E. D. and Hodovanets, H. and Thaler, A. N. and Schmalian, J. and Bud’ko, S. L. and Canfield, P. C. and Kaminski, A.},
abstractNote = {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.},
doi = {10.1103/PhysRevB.84.020509},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 2,
volume = 84,
place = {United States},
year = {2011},
month = {7}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevB.84.020509

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Cited by: 84 works
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