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- W4322723944 abstract "Abstract We perform a microscopic study of itinerant ferromagnetic systems. We reveal a very rich phase diagram in the three-dimensional space spanned by the chemical potential, a magnetic field, and temperature beyond the Landau theory analyzed so far. Besides a generic wing structure near a tricritical point upon introducing the magnetic field, we find that an additional wing can be generated close to a quantum critical end point (QCEP) and also even from deeply inside the ferromagnetic phase. A tilting of the wing controls the entropy jump associated with the metamagnetic transition. Ferromagnetic and metamagnetic transitions are usually accompanied by a Lifshitz transition at low temperatures, i.e. a change of Fermi surface topology including the disappearance of the Fermi surface. In particular, the Fermi surface of either spin band vanishes at the QCEP. These rich phase diagrams are understood in terms of the density of states and the breaking of particle-hole symmetry in the presence of a next nearest-neighbor-hopping integral t ʹ, which is expected in actual materials. The obtained phase diagrams are discussed in a possible connection to itinerant ferromagnetic systems such as UGe 2 , UCoAl, ZrZn 2 , and others including materials exhibiting the magnetocaloric effect." @default.
- W4322723944 created "2023-03-03" @default.
- W4322723944 creator A5016244276 @default.
- W4322723944 date "2023-03-01" @default.
- W4322723944 modified "2023-09-30" @default.
- W4322723944 title "Ferromagnetic and metamagnetic transitions in itinerant electron systems: a microscopic study" @default.
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- W4322723944 doi "https://doi.org/10.1088/1367-2630/acc04d" @default.
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