Quantum fluctuation driven first order phase transition in weak ferromagnetic metals

Details Quantum fluctuation driven first order phase transition in weak ferromagnetic metals Quantum fluctuation driven first order phase transition in weak ferromagnetic metals

2004-02-19

arxiv.org/abs/cond-mat/0402507v1

Philosophical Magazine, Vol. 85, No. 16, 1755, (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 5 figures

Scientific paper

10.1080/14786430500040720

In a local Fermi liquid (LFL), we show that there is a line of weak first order phase transitions between the ferromagnetic and paramagnetic phases due to purely quantum fluctuations. We predict that an instability towards superconductivity is only possible in the ferromagnetic state. At T=0 we find a point on the phase diagram where all three phases meet and we call this a quantum triple point (QTP). A simple application of the Gibbs phase rule shows that only these three phases can meet at the QTP. This provides a natural explanation of the absence of superconductivity at this point coming from the paramagnetic side of the phase diagram, as observed in the recently discovered ferromagnetic superconductor, $UGe_{2}$.

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