Angle-resolved photoemission spectroscopy of Co-based boride superconductor LaCo 1.73Fe 0.27B 2

K. Nakayama; E. Ieki; Y. Tanaka; T. Sato; T. Takahashi; T. Kuroda; H. Mizoguchi; S. W. Kim; H. Hosono

doi:10.1103/PhysRevB.86.014503

Angle-resolved photoemission spectroscopy of Co-based boride superconductor LaCo _1.73Fe _0.27B ₂

K. Nakayama, E. Ieki, Y. Tanaka, T. Sato, T. Takahashi, T. Kuroda, H. Mizoguchi, S. W. Kim, H. Hosono

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

1 Citation (Scopus)

Abstract

We have performed angle-resolved photoemission spectroscopy of Co-based boride superconductor LaCo _1.73Fe _0.27B ₂ (T _c=4.1 K), which is isostructural to the 122-type Fe-pnictide superconductor with the pnictogen atom being replaced with boron. We found that the Fermi level is located at a dip in the density of states (DOS) in contrast to Co-pnictide ferromagnets. This reduction in DOS together with the strong Co 3d-B 2p covalent bonding removes the ferromagnetic order and may cause the superconductivity. The energy bands near the Fermi level show higher three dimensionality and a weaker electron-correlation effect than those of Fe pnictides. The Fermi surface topology is considerably different from that of Fe pnictides, suggesting the difference in the superconducting mechanism between boride and pnictide superconductors.

Original language	English
Article number	014503
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	86
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevB.86.014503
Publication status	Published - 2012 Jul 5

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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Angle-resolved photoemission spectroscopy of Co-based boride superconductor LaCo _1.73Fe _0.27B ₂ . / Nakayama, K.; Ieki, E.; Tanaka, Y.; Sato, T.; Takahashi, T.; Kuroda, T.; Mizoguchi, H.; Kim, S. W.; Hosono, H.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 86, No. 1, 014503, 05.07.2012.

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

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abstract = "We have performed angle-resolved photoemission spectroscopy of Co-based boride superconductor LaCo 1.73Fe 0.27B 2 (T c=4.1 K), which is isostructural to the 122-type Fe-pnictide superconductor with the pnictogen atom being replaced with boron. We found that the Fermi level is located at a dip in the density of states (DOS) in contrast to Co-pnictide ferromagnets. This reduction in DOS together with the strong Co 3d-B 2p covalent bonding removes the ferromagnetic order and may cause the superconductivity. The energy bands near the Fermi level show higher three dimensionality and a weaker electron-correlation effect than those of Fe pnictides. The Fermi surface topology is considerably different from that of Fe pnictides, suggesting the difference in the superconducting mechanism between boride and pnictide superconductors.",

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AU - Nakayama, K.

AU - Ieki, E.

AU - Tanaka, Y.

AU - Sato, T.

AU - Takahashi, T.

AU - Kuroda, T.

AU - Mizoguchi, H.

AU - Kim, S. W.

AU - Hosono, H.

PY - 2012/7/5

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AB - We have performed angle-resolved photoemission spectroscopy of Co-based boride superconductor LaCo 1.73Fe 0.27B 2 (T c=4.1 K), which is isostructural to the 122-type Fe-pnictide superconductor with the pnictogen atom being replaced with boron. We found that the Fermi level is located at a dip in the density of states (DOS) in contrast to Co-pnictide ferromagnets. This reduction in DOS together with the strong Co 3d-B 2p covalent bonding removes the ferromagnetic order and may cause the superconductivity. The energy bands near the Fermi level show higher three dimensionality and a weaker electron-correlation effect than those of Fe pnictides. The Fermi surface topology is considerably different from that of Fe pnictides, suggesting the difference in the superconducting mechanism between boride and pnictide superconductors.

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