Spin-Fluctuation-Induced Non-Fermi-Liquid Behavior with Suppressed Superconductivity in LiFe1−xCoxAs

We study a series of LiFe1−xCoxAs compounds with different Co concentrations by transport, optical spectroscopy, angle-resolved photoemission spectroscopy, and nuclear magnetic resonance. We observe a Fermi-liquid to non-Fermi-liquid to Fermi-liquid (FL-NFL-FL) crossover alongside a monotonic suppre...

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Bibliographic Details
Published in:Physical review. X 2015-09, Vol.5 (3)
Main Authors: Dai, Y M, Miao, H, Xing, L Y, Wang, X C, Wang, P S, Xiao, H, Qian, T, Richard, P, Qiu, X G, W. Yu, Jin, C Q, Wang, Z, Johnson, P D, Homes, C C, Ding, H
Format: Article
Language:English
Subjects:
Condensed matter physics
Energy
Fermi liquids
Fermi surfaces
High temperature
Nesting
NMR
Nuclear magnetic resonance
Phase diagrams
Photoelectric emission
Single crystals
Spectrum analysis
Superconductivity
Superconductors
Transition temperature
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Summary:We study a series of LiFe1−xCoxAs compounds with different Co concentrations by transport, optical spectroscopy, angle-resolved photoemission spectroscopy, and nuclear magnetic resonance. We observe a Fermi-liquid to non-Fermi-liquid to Fermi-liquid (FL-NFL-FL) crossover alongside a monotonic suppression of the superconductivity with increasing Co content. In parallel to the FL-NFL-FL crossover, we find that both the low-energy spin fluctuations and Fermi surface nesting are enhanced and then diminished, strongly suggesting that the NFL behavior in LiFe1−xCoxAs is induced by low-energy spin fluctuations that are very likely tuned by Fermi surface nesting. Our study reveals a unique phase diagram of LiFe1−xCoxAs where the region of NFL is moved to the boundary of the superconducting phase, implying that they are probably governed by different mechanisms.
ISSN:2160-3308
DOI:10.1103/PhysRevX.5.031035