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- W3215691172 abstract "We analyze a mean-field model of itinerant electrons with a ferromagnetic interaction on a square lattice and perform a comprehensive study of the phase diagram in the three-dimensional space spanned by the chemical potential, a magnetic field, and temperature. The ferromagnetic phase is stabilized below a dome-shaped transition line with the maximal Tc near van Hove filling. The transition is second order at high temperatures and becomes first order at low temperatures. When the interaction strength becomes large, another ferromagnetic dome is realized near the band edge with a quantum critical point at the band edge and a first-order transition on the other edge of the dome. The two ferromagnetic phases merge into one for further larger interaction strength. By applying a magnetic field, wing structures develop from the first-order transition lines at zero field. The wing describes a first-order transition surface, namely a metamagnetic transition. When the system is tuned close to the band edge in the field, the wing can shrink and vanish, leading to a quantum critical end point (QCEP) at zero temperature. This QCEP is a Lifshitz point in the sense that the Fermi surface of either spin band vanishes. Close to the QCEP, another wing develops at very low temperatures in a higher field region. For a large interaction strength, however, the QCEP disappears. Furthermore, a metamagnetic transition occurs also inside the ferromagnetic phase without a magnetic field. Consequently another wing also develops from that by applying the field. Our obtained phase diagrams are discussed as a possible connection to itinerant ferromagnetic systems such as UGe2, UCoAl, ZrZn2, and others including magnetocaloric effect materials." @default.
- W3215691172 created "2021-12-06" @default.
- W3215691172 creator A5016244276 @default.
- W3215691172 date "2021-11-19" @default.
- W3215691172 modified "2023-09-26" @default.
- W3215691172 title "Phase diagram of ferromagnetic and metamagnetic transitions in itinerant electron system" @default.
- W3215691172 cites W2005554422 @default.
- W3215691172 cites W2070981923 @default.
- W3215691172 doi "https://doi.org/10.48550/arxiv.2111.10068" @default.
- W3215691172 hasPublicationYear "2021" @default.
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