Multicritical points in a model for 5f-electron systems under pressure and magnetic field
| Autor: | Peter S. Riseborough, Julián Faúndez, E. J. Calegari, S. G. Magalhaes |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Physics
Phase transition Magnetic moment Condensed matter physics Exchange interaction 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Magnetic field T-symmetry Phase (matter) 0103 physical sciences Coulomb General Materials Science 010306 general physics 0210 nano-technology Phase diagram |
| Zdroj: | Journal of Physics: Condensed Matter. 33:295801 |
| ISSN: | 1361-648X 0953-8984 |
| DOI: | 10.1088/1361-648x/abe476 |
| Popis: | We investigate the evolution of multicritical points under pressure and magnetic field in a model described by two 5f bands (called α and β) that hybridize with a single itinerant conduction band. The interaction is given by the direct Coulomb and the Hund’s rule exchange terms. Three types of orderings are considered: two conventional spin density waves (SDWs) and an exotic SDW, i.e., with no magnetic moment formation. The conventional SDWs phases, are characterized by }{m}_{f}^{\alpha }$?> m f β > m f α and }{m}_{f}^{\beta }$?> m f α > m f β , respectively, where m f α and m f β are the intraband staggered magnetizations. The exotic SDW, which has time reversal symmetry, is described by a purely imaginary order parameter. This phase is related to a band mixing given by the spin-flip part of the Hund’s rule exchange interaction. As result, without magnetic field, the phase diagrams of temperature (T) versus pressure (given by the variation of the bandwidth (W)) shows a sequence of phase transitions involving the three phases which gives rise to multicritical points. The presence of the magnetic field (h z ) has drastic effects on part of the phase diagram and the location of the multicritical points. |
| Databáze: | OpenAIRE |
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