Temperature-dependent pseudogap in the oxypnictides LaFeAsO1-x Fx and LaFePO1-x Fx seen via angle-integrated photoemission

Y. Ishida; T. Shimojima; K. Ishizaka; T. Kiss; M. Okawa; T. Togashi; S. Watanabe; X. Y. Wang; C. T. Chen; Y. Kamihara; M. Hirano; H. Hosono; S. Shin

doi:10.1103/PhysRevB.79.060503

Temperature-dependent pseudogap in the oxypnictides LaFeAsO1-x Fx and LaFePO1-x Fx seen via angle-integrated photoemission

Y. Ishida^*, T. Shimojima, K. Ishizaka, T. Kiss, M. Okawa, T. Togashi, S. Watanabe, X. Y. Wang, C. T. Chen, Y. Kamihara, M. Hirano, H. Hosono, S. Shin

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

25 Citations (Scopus)

Abstract

We have performed a temperature-dependent angle-integrated laser photoemission study of iron oxypnictide superconductors LaFeAsO:F and LaFePO:F exhibiting critical-transition temperatures (Tc 's) of 26 and 5 K, respectively. We find that high- Tc LaFeAsO:F exhibits a temperature-dependent pseudogaplike feature extending over ∼0.1 eV about the Fermi level at 250 K, whereas such a feature is absent in low- Tc LaFePO:F. We also find ∼20-meV pseudogaplike features and signatures of superconducting gaps in both LaFeAsO:F and LaFePO:F. We discuss the possible origins of the unusual pseudogaplike features through comparison with the high- Tc cuprates.

Original language	English
Article number	060503
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	79
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevB.79.060503
Publication status	Published - 2009 Feb 2
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.79.060503

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Ishida, Y., Shimojima, T., Ishizaka, K., Kiss, T., Okawa, M., Togashi, T., Watanabe, S., Wang, X. Y., Chen, C. T., Kamihara, Y., Hirano, M., Hosono, H., & Shin, S. (2009). Temperature-dependent pseudogap in the oxypnictides LaFeAsO1-x Fx and LaFePO1-x Fx seen via angle-integrated photoemission. Physical Review B - Condensed Matter and Materials Physics, 79(6), Article 060503. https://doi.org/10.1103/PhysRevB.79.060503

Ishida, Y, Shimojima, T, Ishizaka, K, Kiss, T, Okawa, M, Togashi, T, Watanabe, S, Wang, XY, Chen, CT, Kamihara, Y, Hirano, M, Hosono, H & Shin, S 2009, 'Temperature-dependent pseudogap in the oxypnictides LaFeAsO1-x Fx and LaFePO1-x Fx seen via angle-integrated photoemission', Physical Review B - Condensed Matter and Materials Physics, vol. 79, no. 6, 060503. https://doi.org/10.1103/PhysRevB.79.060503

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title = "Temperature-dependent pseudogap in the oxypnictides LaFeAsO1-x Fx and LaFePO1-x Fx seen via angle-integrated photoemission",

abstract = "We have performed a temperature-dependent angle-integrated laser photoemission study of iron oxypnictide superconductors LaFeAsO:F and LaFePO:F exhibiting critical-transition temperatures (Tc 's) of 26 and 5 K, respectively. We find that high- Tc LaFeAsO:F exhibits a temperature-dependent pseudogaplike feature extending over ∼0.1 eV about the Fermi level at 250 K, whereas such a feature is absent in low- Tc LaFePO:F. We also find ∼20-meV pseudogaplike features and signatures of superconducting gaps in both LaFeAsO:F and LaFePO:F. We discuss the possible origins of the unusual pseudogaplike features through comparison with the high- Tc cuprates.",

author = "Y. Ishida and T. Shimojima and K. Ishizaka and T. Kiss and M. Okawa and T. Togashi and S. Watanabe and Wang, {X. Y.} and Chen, {C. T.} and Y. Kamihara and M. Hirano and H. Hosono and S. Shin",

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doi = "10.1103/PhysRevB.79.060503",

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AU - Ishida, Y.

AU - Shimojima, T.

AU - Ishizaka, K.

AU - Kiss, T.

AU - Okawa, M.

AU - Togashi, T.

AU - Watanabe, S.

AU - Wang, X. Y.

AU - Chen, C. T.

AU - Kamihara, Y.

AU - Hirano, M.

AU - Hosono, H.

AU - Shin, S.

PY - 2009/2/2

Y1 - 2009/2/2

N2 - We have performed a temperature-dependent angle-integrated laser photoemission study of iron oxypnictide superconductors LaFeAsO:F and LaFePO:F exhibiting critical-transition temperatures (Tc 's) of 26 and 5 K, respectively. We find that high- Tc LaFeAsO:F exhibits a temperature-dependent pseudogaplike feature extending over ∼0.1 eV about the Fermi level at 250 K, whereas such a feature is absent in low- Tc LaFePO:F. We also find ∼20-meV pseudogaplike features and signatures of superconducting gaps in both LaFeAsO:F and LaFePO:F. We discuss the possible origins of the unusual pseudogaplike features through comparison with the high- Tc cuprates.

AB - We have performed a temperature-dependent angle-integrated laser photoemission study of iron oxypnictide superconductors LaFeAsO:F and LaFePO:F exhibiting critical-transition temperatures (Tc 's) of 26 and 5 K, respectively. We find that high- Tc LaFeAsO:F exhibits a temperature-dependent pseudogaplike feature extending over ∼0.1 eV about the Fermi level at 250 K, whereas such a feature is absent in low- Tc LaFePO:F. We also find ∼20-meV pseudogaplike features and signatures of superconducting gaps in both LaFeAsO:F and LaFePO:F. We discuss the possible origins of the unusual pseudogaplike features through comparison with the high- Tc cuprates.

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Temperature-dependent pseudogap in the oxypnictides LaFeAsO1-x Fx and LaFePO1-x Fx seen via angle-integrated photoemission

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