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Infrared spectroscopy under multiextreme conditions: Direct observation of pseudogap formation and collapse in CeSb

T. Nishi1, S. Kimura1,2,*, T. Takahashi3, Y. Mori4, Y. S. Kwon2,5, H. J. Im1, and H. Kitazawa6

  • 1Department of Structural Molecular Science, The Graduate University for Advanced Studies, Okazaki 444-8585, Japan
  • 2UVSOR Facility, Institute for Molecular Science, Okazaki 444-8585, Japan
  • 3Research Reactor Institute, Kyoto University, Osaka 590-0494, Japan
  • 4Department of Physics, Okayama University of Science, Okayama 700-0005, Japan
  • 5Department of Physics, Sungkyunkwan University, Suwon 440-746, South Korea
  • 6Nano-Materials Laboratory, National Institute for Materials Science, Tsukuba 305-0047, Japan

  • *Electronic address: kimura@ims.ac.jp
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Phys. Rev. B 71, 220401(R) – Published 2 June, 2005

DOI: https://doi.org/10.1103/PhysRevB.71.220401

Abstract

Infrared reflectivity measurements of CeSb under multiextreme conditions (low temperatures, high pressures, and high magnetic fields) were performed. A pseudogap structure, which originates from the magnetic band folding effect, responsible for the large enhancement in the electrical resistivity in the single-layered antiferromagnetic structure (AF-1 phase) was found at a pressure of 4 GPa and at temperatures of 35–50 K. The optical spectrum of the pseudogap changes to that of a metallic structure with increasing magnetic field strength and increasing temperature. This change is the result of the magnetic phase transition from the AF-1 phase to other phases as a function of the magnetic field strength and temperature. This result is an important optical observation of the formation and collapse of a pseudogap under multiextreme conditions.

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Phys. Rev. B 71, 220401(R)– Published 2 June, 2005
  • Received 1 December 2004

© 2005 American Physical Society

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