Non-chiral spin frustration versus highly degenerate ferromagnetic state with local chiral degrees of freedom of an exactly solvable spin-electron planar model of inter-connected trigonal bipyramids
| Autor: | Lucia Gálisová |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Physics
Phase transition Condensed matter physics Statistical Mechanics (cond-mat.stat-mech) media_common.quotation_subject Degenerate energy levels Degrees of freedom (physics and chemistry) Frustration FOS: Physical sciences Condensed Matter Physics Condensed Matter::Disordered Systems and Neural Networks Electronic Optical and Magnetic Materials Ferromagnetism Ising model Condensed Matter::Strongly Correlated Electrons Ground state Condensed Matter - Statistical Mechanics Spin-½ media_common |
| DOI: | 10.48550/arxiv.2109.14366 |
| Popis: | The frustration phenomenon in an exactly solvable spin-electron planar model constituted by identical bipyramidal plaquettes is discussed within the Toulouse's and dos Santos and Lyra's frustration concepts. It is shown that the ground state of the model contains the unfrustrated spontaneously ordered quantum ferromagnetic phase with local chiral degrees of freedom in the electron sub-lattice and the disordered quantum one, where both the Ising and electron sub-lattices are frustrated. The frustration of the latter sub-lattice persists at finite temperatures, but only in the disordered region. It finally vanishes at a certain frustration temperature. The reentrant behaviour of the frustration in the electron sub-lattice with three consecutive frustration temperatures due to a competition with the unfrustrated ferromagnetic spin arrangement near the ground-state phase transition can also be observed. Comment: 4 pages, 4 figures |
| Databáze: | OpenAIRE |
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