Superconductivity and magnetic order in CeRhIn$_{5}$; spectra of coexistence

Details Superconductivity and magnetic order in CeRhIn$_{5}$; spectra of coexistence Superconductivity and magnetic order in CeRhIn$_{5}$; spectra of coexistence

2007-04-09

arxiv.org/abs/0704.1082v1

Phys. Rev. Lett. 98 126406 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

We discuss the fixed-point Hamiltonian and the spectrum of excitations of a quasi-bidimensional electronic system supporting simultaneously antiferromamagnetic ordering and superconductivity. The coexistence of these two order parameters in a single phase is possible because the magnetic order is linked to the formation of a spin density wave, and its order parameter is not associated to a spectral gap but to an energy shift of the paramagnetic bands. This peculiarity entails several distinct features in the phase diagram and the spectral properties of the model, which may have been observed in CeRhIn$_5$. Apart from the coexistence, we find an abrupt suppression of the spin density wave when the superconducting and magnetic ordering temperatures are equal. The divergence of the cyclotron mass extracted from de Haas-van Alphen experiments is also analyzed in the same framework.

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