Identification of a Marginal Fermi-Liquid in Itinerant Ferromagnet CoS2

Details Identification of a Marginal Fermi-Liquid in Itinerant Ferromagnet CoS2 Identification of a Marginal Fermi-Liquid in Itinerant Ferromagnet CoS2

2008-06-17

arxiv.org/abs/0806.2819v1

Physical Review B (Rapid Comm) 79, 060401 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

We report specific heat, resistivity and susceptibility measurements at different temperatures, magnetic fields, and pressures to provide solid evidence of CoS2 being a marginal Fermi liquid. The presence of a tricritical point in the phase diagram of the system provides an opportunity to test the spin fluctuation theory with a high limit of accuracy. A magnetic field suppresses the amplitude of the spin fluctuations and recovers conventional Fermi liquid behavior, connecting both states continuously.

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