Evolution from incoherent to coherent electronic states and its implications for superconductivity in FeTe1-x Sex

E. Ieki; K. Nakayama; Y. Miyata; T. Sato; H. Miao; N. Xu; X. P. Wang; P. Zhang; T. Qian; P. Richard; Z. J. Xu; J. S. Wen; G. D. Gu; H. Q. Luo; H. H. Wen; H. Ding; T. Takahashi

doi:10.1103/PhysRevB.89.140506

Evolution from incoherent to coherent electronic states and its implications for superconductivity in FeTe1-x Sex

E. Ieki, K. Nakayama, Y. Miyata, T. Sato, H. Miao, N. Xu, X. P. Wang, P. Zhang, T. Qian, P. Richard, Z. J. Xu, J. S. Wen, G. D. Gu, H. Q. Luo, H. H. Wen, H. Ding, T. Takahashi

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Abstract

We have performed systematic angle-resolved photoemission spectroscopy (ARPES) of iron-chalcogenide superconductor FeTe1-xSex (0≤x≤0.45) to elucidate the electronic states relevant to the superconductivity. While the Fermi-surface shape is nearly independent of x, we found that the ARPES spectral line shape shows prominent x dependence. A broad ARPES spectrum characterized by a small quasiparticle weight at x=0, indicative of incoherent electronic states, becomes progressively sharper with increasing x, and a well-defined quasiparticle peak appears around x=0.45 where bulk superconductivity is realized. The present result suggests the evolution from incoherent to coherent electronic states and its close relationship to the emergence of superconductivity.

Original language	English
Article number	140506
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	89
Issue number	14
DOIs	https://doi.org/10.1103/PhysRevB.89.140506
State	Published - Apr 28 2014
Externally published	Yes

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Ieki, E., Nakayama, K., Miyata, Y., Sato, T., Miao, H., Xu, N., Wang, X. P., Zhang, P., Qian, T., Richard, P., Xu, Z. J., Wen, J. S., Gu, G. D., Luo, H. Q., Wen, H. H., Ding, H., & Takahashi, T. (2014). Evolution from incoherent to coherent electronic states and its implications for superconductivity in FeTe1-x Sex. Physical Review B - Condensed Matter and Materials Physics, 89(14), Article 140506. https://doi.org/10.1103/PhysRevB.89.140506

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abstract = "We have performed systematic angle-resolved photoemission spectroscopy (ARPES) of iron-chalcogenide superconductor FeTe1-xSex (0≤x≤0.45) to elucidate the electronic states relevant to the superconductivity. While the Fermi-surface shape is nearly independent of x, we found that the ARPES spectral line shape shows prominent x dependence. A broad ARPES spectrum characterized by a small quasiparticle weight at x=0, indicative of incoherent electronic states, becomes progressively sharper with increasing x, and a well-defined quasiparticle peak appears around x=0.45 where bulk superconductivity is realized. The present result suggests the evolution from incoherent to coherent electronic states and its close relationship to the emergence of superconductivity.",

author = "E. Ieki and K. Nakayama and Y. Miyata and T. Sato and H. Miao and N. Xu and Wang, {X. P.} and P. Zhang and T. Qian and P. Richard and Xu, {Z. J.} and Wen, {J. S.} and Gu, {G. D.} and Luo, {H. Q.} and Wen, {H. H.} and H. Ding and T. Takahashi",

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doi = "10.1103/PhysRevB.89.140506",

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Ieki, E, Nakayama, K, Miyata, Y, Sato, T, Miao, H, Xu, N, Wang, XP, Zhang, P, Qian, T, Richard, P, Xu, ZJ, Wen, JS, Gu, GD, Luo, HQ, Wen, HH, Ding, H & Takahashi, T 2014, 'Evolution from incoherent to coherent electronic states and its implications for superconductivity in FeTe1-x Sex', Physical Review B - Condensed Matter and Materials Physics, vol. 89, no. 14, 140506. https://doi.org/10.1103/PhysRevB.89.140506

TY - JOUR

T1 - Evolution from incoherent to coherent electronic states and its implications for superconductivity in FeTe1-x Sex

AU - Ieki, E.

AU - Nakayama, K.

AU - Miyata, Y.

AU - Sato, T.

AU - Miao, H.

AU - Xu, N.

AU - Wang, X. P.

AU - Zhang, P.

AU - Qian, T.

AU - Richard, P.

AU - Xu, Z. J.

AU - Wen, J. S.

AU - Gu, G. D.

AU - Luo, H. Q.

AU - Wen, H. H.

AU - Ding, H.

AU - Takahashi, T.

PY - 2014/4/28

Y1 - 2014/4/28

N2 - We have performed systematic angle-resolved photoemission spectroscopy (ARPES) of iron-chalcogenide superconductor FeTe1-xSex (0≤x≤0.45) to elucidate the electronic states relevant to the superconductivity. While the Fermi-surface shape is nearly independent of x, we found that the ARPES spectral line shape shows prominent x dependence. A broad ARPES spectrum characterized by a small quasiparticle weight at x=0, indicative of incoherent electronic states, becomes progressively sharper with increasing x, and a well-defined quasiparticle peak appears around x=0.45 where bulk superconductivity is realized. The present result suggests the evolution from incoherent to coherent electronic states and its close relationship to the emergence of superconductivity.

AB - We have performed systematic angle-resolved photoemission spectroscopy (ARPES) of iron-chalcogenide superconductor FeTe1-xSex (0≤x≤0.45) to elucidate the electronic states relevant to the superconductivity. While the Fermi-surface shape is nearly independent of x, we found that the ARPES spectral line shape shows prominent x dependence. A broad ARPES spectrum characterized by a small quasiparticle weight at x=0, indicative of incoherent electronic states, becomes progressively sharper with increasing x, and a well-defined quasiparticle peak appears around x=0.45 where bulk superconductivity is realized. The present result suggests the evolution from incoherent to coherent electronic states and its close relationship to the emergence of superconductivity.

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DO - 10.1103/PhysRevB.89.140506

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VL - 89

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

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M1 - 140506

ER -

Evolution from incoherent to coherent electronic states and its implications for superconductivity in FeTe1-x Sex

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