Low-Energy Electronic Structure of the Kondo Insulator <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi>YbB</mi></mrow><mrow><mn>12</mn></mrow></msub></mrow></math></span>

T. Susaki; A. Sekiyama; K. Kobayashi; T. Mizokawa; A. Fujimori; M. Tsunekawa; T. Muro; T. Matsushita; S. Suga; H. Ishii; T. Hanyu; A. Kimura; H. Namatame; M. Taniguchi; T. Miyahara; F. Iga; M. Kasaya; H. Harima

doi:10.1103/PhysRevLett.77.4269

Low-Energy Electronic Structure of the Kondo Insulator ${YbB}_{12}$

T. Susaki, A. Sekiyama, K. Kobayashi, T. Mizokawa, A. Fujimori, M. Tsunekawa, T. Muro, T. Matsushita, S. Suga, H. Ishii, T. Hanyu, A. Kimura, H. Namatame, M. Taniguchi, T. Miyahara, F. Iga, M. Kasaya, and H. Harima

Phys. Rev. Lett. 77, 4269 – Published 11 November 1996

Abstract

We have studied the low-energy electronic structure of a Kondo insulator ${YbB}_{12}$ by high-resolution photoemission spectroscopy. A “Kondo peak” is observed $\sim 25$ meV below the Fermi level, which agrees well with the Kondo temperature, whereas the gap at the Fermi level is found much smaller, indicating that the magnetic properties at higher temperatures ( $≳$ 75 K) are indeed determined by the Kondo effect in spite of the gap formation at lower temperatures. A renormalized band picture is presented to describe the coexistence of the Kondo peak and the transport gap as well as the highly asymmetric line shape of the Kondo peak.

Received 20 May 1996

DOI:https://doi.org/10.1103/PhysRevLett.77.4269

Authors & Affiliations

T. Susaki¹, A. Sekiyama¹, K. Kobayashi¹, T. Mizokawa¹, A. Fujimori¹, M. Tsunekawa², T. Muro², T. Matsushita², S. Suga², H. Ishii³, T. Hanyu³, A. Kimura⁴, H. Namatame⁵, M. Taniguchi⁵, T. Miyahara⁶, F. Iga⁵, M. Kasaya⁷, and H. Harima⁸

¹Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113, Japan
²Department of Material Physics, Osaka University, Toyonaka, Osaka 560, Japan
³Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-03, Japan
⁴Institute for Solid State Physics, University of Tokyo, Roppongi, Minato-ku, Tokyo 106, Japan
⁵Department of Materials Sciences, Hiroshima University, Higashi-Hiroshima 739, Japan
⁶Photon Factory, National Laboratory for High Energy Physics, Tsukuba, Ibaraki 305, Japan
⁷Department of Physics, Tohoku University, Sendai 980-77, Japan
⁸College of Integrated Arts and Science, University of Osaka Prefecture, Gakuen-cho, Sakai 593, Japan

Comments & Replies

Susaki et al. Reply:

T. Susaki, A. Sekiyama, K. Kobayashi, T. Mizokawa, A. Fujimori, M. Tsunekawa, T. Muro, T. Matsushita, S. Suga, H. Ishii, T. Hanyu, A. Kimura, H. Namatame, M. Taniguchi, T. Miyahara, F. Iga, M. Kasaya, and H. Harima

Phys. Rev. Lett. 78, 1832 (1997)

Intrinsic Photoemission Spectra for ${YbB}_{12}$

J. J. Joyce and A. J. Arko

Phys. Rev. Lett. 78, 1831 (1997)

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Vol. 77, Iss. 20 — 11 November 1996

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Physical Review Letters

Low-Energy Electronic Structure of the Kondo Insulator YbB12

T. Susaki, A. Sekiyama, K. Kobayashi, T. Mizokawa, A. Fujimori, M. Tsunekawa, T. Muro, T. Matsushita, S. Suga, H. Ishii, T. Hanyu, A. Kimura, H. Namatame, M. Taniguchi, T. Miyahara, F. Iga, M. Kasaya, and H. Harima

Phys. Rev. Lett. 77, 4269 – Published 11 November 1996

Abstract

Authors & Affiliations

Comments & Replies

Susaki et al. Reply:

T. Susaki, A. Sekiyama, K. Kobayashi, T. Mizokawa, A. Fujimori, M. Tsunekawa, T. Muro, T. Matsushita, S. Suga, H. Ishii, T. Hanyu, A. Kimura, H. Namatame, M. Taniguchi, T. Miyahara, F. Iga, M. Kasaya, and H. Harima

Phys. Rev. Lett. 78, 1832 (1997)

Intrinsic Photoemission Spectra for YbB12

J. J. Joyce and A. J. Arko

Phys. Rev. Lett. 78, 1831 (1997)

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Low-Energy Electronic Structure of the Kondo Insulator ${YbB}_{12}$

Intrinsic Photoemission Spectra for ${YbB}_{12}$