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Fermionology in Kondo-Heisenberg model | | Yin Zhong
; Lan Zhang
; Han-Tao Lu
; Hong-Gang Luo
; | | Date: |
23 Oct 2014 | | Abstract: | Fermi surface of heavy electron systems plays a fundamental role in
understanding their variety of puzzling phenomena, for example, quantum
criticality, strange metal behavior, unconventional superconductivity and even
enigmatic phases with yet unknown order parameters. The spectroscopy
measurement of typical heavy fermion superconductor CeCoIn$_{5}$ has
demonstrated multi-Fermi surface structure, which has not been in detail
studied theoretically in a model system like the Kondo-Heisenberg model. In
this work, we make a step toward such an issue in terms of the well-established
large-N mean-field theory. However, it is surprised that the self-consistent
calculation cannot reproduced the fermionology of the experimental observation
of the system due to the unfounded sign binding between the hopping of the
conduction electrons and the mean-field valence bond order. It is found that
the fermionology of the system can be well reproduced if one relaxes the
binding and considers the mean-field bond operator as a free parameter. Given
the fermionology, the calculated entropy and superfluid density are in
qualitative agreement with the experimental results, which confirms our
treatment of the mean-field theory. Our result supports a
$d_{x^{2}-y^{2}}$-wave pairing structure in heavy fermion material
CeCoIn$_{5}$. In addition, we have also provided the scanning tunneling
microscopy(STM) spectra of the system, which is able to be tested by the
present STM experiments. | | Source: | arXiv, 1410.6261 | | Services: | Forum | Review | PDF | Favorites | |
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