Metamagnetic behavior and Kondo breakdown in heavy-fermion CeFePO

S. Kitagawa, H. Ikeda, Y. Nakai, T. Hattori, K. Ishida, Y. Kamihara, M. Hirano, H. Hosono

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We report that nonmagnetic heavy-fermion (HF) iron oxypnictide CeFePO with two-dimensional XY-type anisotropy shows a metamagnetic behavior at the metamagnetic field H M4T perpendicular to the c axis and that a critical behavior is observed around H M. Although the magnetic character is entirely different from that in other Ce-based HF metamagnets, H M in these metamagnets is linearly proportional to the inverse of the effective mass, or to the temperature where the susceptib+ility shows a peak. This finding suggests that H M is a magnetic field breaking the local Kondo singlet, and the critical behavior around H M is driven by the Kondo breakdown accompanied by the Fermi-surface instability.

Original languageEnglish
Article number277002
JournalPhysical review letters
Issue number27
Publication statusPublished - 2011 Dec 29

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Kitagawa, S., Ikeda, H., Nakai, Y., Hattori, T., Ishida, K., Kamihara, Y., Hirano, M., & Hosono, H. (2011). Metamagnetic behavior and Kondo breakdown in heavy-fermion CeFePO. Physical review letters, 107(27), [277002].