Spin-fluctuation-induced non-fermi-liquid behavior with suppressed superconductivity in LiFe1-xCoxAs

Y. M. Dai; H. Miao; L. Y. Xing; X. C. Wang; P. S. Wang; H. Xiao; T. Qian; P. Richard; X. G. Qiu; W. Yu; C. Q. Jin; Z. Wang; P. D. Johnson; C. C. Homes; H. Ding

doi:10.1103/PhysRevX.5.031035

Spin-fluctuation-induced non-fermi-liquid behavior with suppressed superconductivity in LiFe_1-xCo_xAs

Y. M. Dai, H. Miao, L. Y. Xing, X. C. Wang, P. S. Wang, H. Xiao, T. Qian, P. Richard, X. G. Qiu, W. Yu, C. Q. Jin, Z. Wang, P. D. Johnson, C. C. Homes, H. Ding

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44 Scopus citations

Abstract

We study a series of LiFe_1-xCo_xAs 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 LiFe_1-xCo_xAs is induced by low-energy spin fluctuations that are very likely tuned by Fermi surface nesting. Our study reveals a unique phase diagram of LiFe_1-xCo_xAs where the region of NFL is moved to the boundary of the superconducting phase, implying that they are probably governed by different mechanisms.

Original language	English
Article number	031035
Journal	Physical Review X
Volume	5
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevX.5.031035
State	Published - 2015
Externally published	Yes

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title = "Spin-fluctuation-induced non-fermi-liquid behavior with suppressed superconductivity in LiFe1-xCoxAs",

abstract = "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.",

author = "Dai, {Y. M.} and H. Miao and Xing, {L. Y.} and Wang, {X. C.} and Wang, {P. S.} and H. Xiao and T. Qian and P. Richard and Qiu, {X. G.} and W. Yu and Jin, {C. Q.} and Z. Wang and Johnson, {P. D.} and Homes, {C. C.} and H. Ding",

year = "2015",

doi = "10.1103/PhysRevX.5.031035",

language = "English",

volume = "5",

journal = "Physical Review X",

issn = "2160-3308",

publisher = "American Physical Society",

number = "3",

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T1 - Spin-fluctuation-induced non-fermi-liquid behavior with suppressed superconductivity in LiFe1-xCoxAs

AU - Dai, Y. M.

AU - Miao, H.

AU - Xing, L. Y.

AU - Wang, X. C.

AU - Wang, P. S.

AU - Xiao, H.

AU - Qian, T.

AU - Richard, P.

AU - Qiu, X. G.

AU - Yu, W.

AU - Jin, C. Q.

AU - Wang, Z.

AU - Johnson, P. D.

AU - Homes, C. C.

AU - Ding, H.

PY - 2015

Y1 - 2015

N2 - 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.

AB - 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.

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U2 - 10.1103/PhysRevX.5.031035

DO - 10.1103/PhysRevX.5.031035

M3 - Article

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SN - 2160-3308

VL - 5

JO - Physical Review X

JF - Physical Review X

IS - 3

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ER -

Spin-fluctuation-induced non-fermi-liquid behavior with suppressed superconductivity in LiFe_1-xCo_xAs

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