Criticalities in the itinerant ferromagnet UGe${}_2$

Abstract

We provide a microscopic description of the magnetic properties of UGe${}_2$ and in particular, of its both classical and quantum critical behavior. Namely, we account for all the critical points: the critical ending point (CEP) at the metamagnetic phase transition, the tricritical point, and the quantum critical end point at the ferromagnetic to paramagnetic phase transition. Their position agrees quantitatively with experiment. Additionally, we predict that the metamagnetic CEP can be traced down to zero temperature and becomes quantum critical point by a small decrease of both the total electron concentration and the external pressure. The system properties are then determined by the quantum critical fluctuations appearing near the instability point of the Fermi surface topology.

4 pages, 4 figures, PACS number: 71.27.+a, 75.30.Kz, 71.10.-w

References in corpus (6)

• Fermi-liquid instabilities at magnetic quantum phase transitions
• Tricritical point and wing structure in the itinerant ferromagnet UGe2
• Unconventional Quantum Criticality due to Critical Valence Transition
• Ferromagnetism in UGe2 : A microscopic model
• Properties of an almost localized Fermi liquid in applied magnetic field revisited: Statistically consistent Gutzwiller approach
• Electronic structure of UGe${}_2$ at ambient pressure: comparison with X-ray photoemission spectra

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