Heavy Fermion ARPES:  Fermi Surface and High T Heaviness*

J. W. Allen

Randall Laboratory, University of Michigan, Ann Arbor, MI 48104 USA


    A pressing issue in heavy fermion physics is the inclusion or not of f-electrons in the Fermi surface (FS) as material composition or temperature is varied. It is also essential to make definitive tests of predicted electronic structures using density functional theory (DFT) or using dynamic mean field theory (DMFT) coupled with DFT.  Angle resolved photoemission spectroscopy (ARPES) is in principle capable of addressing these issues but is greatly challenged by the low energy and temperature scales for the physics of interest, the three dimensional character of most heavy fermion materials, and the great proclivity for these materials to manifest surface states that obscure the bulk electronic structures. This talk will illustrate these issues and challenges with applications of ARPES to Ce1-xYbxCoIn5 and URu2Si2, including a discussion of the observation of “high T heaviness.”


* In collaboration with N. P. Butch, J. D. Denlinger, L. Dudy, K. Haule, M. Janoschek, B. J. Kim, Kyoo Kim, G. Kotliar, O. Krupin, M. B. Maple, P. M. Oppeneer, K. Rossnagel, J. L. Sarrao, L. Shu, and V. S. Zapf.

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