Report
Frustrated magnetism of spin-1/2 Heisenberg diamond and octahedral chains as a statistical-mechanical monomer-dimer problem
| العنوان: | Frustrated magnetism of spin-1/2 Heisenberg diamond and octahedral chains as a statistical-mechanical monomer-dimer problem |
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| المؤلفون: | Strecka, J., Verkholyak, T., Richter, J., Karlova, K., Derzhko, O., Schnack, J. |
| المصدر: | Phys. Rev. B 105 (2022) 064420 |
| سنة النشر: | 2021 |
| المجموعة: | Condensed Matter Quantum Physics |
| مصطلحات موضوعية: | Condensed Matter - Statistical Mechanics, Quantum Physics |
| الوصف: | It is evidenced that effective lattice-gas models of hard-core monomers and dimers afford a proper description of low-temperature features of spin-1/2 Heisenberg diamond and octahedral chains. Besides monomeric particles assigned within the localized-magnon theory to bound one- and two-magnon eigenstates, the effective monomer-dimer lattice-gas model additionally includes dimeric particles assigned to a singlet-tetramer (singlet-hexamer) state as a cornerstone of dimer-tetramer (tetramer-hexamer) ground state of a spin-1/2 Heisenberg diamond (octahedral) chain. A feasibility of the effective description is confirmed through the exact diagonalization and finite-temperature Lanczos methods. Both quantum spin chains display rich ground-state phase diagrams including discontinuous as well as continuous field-driven phase transitions, whereby the specific heat shows in vicinity of the former phase transitions an extraordinary low-temperature peak coming from a highly-degenerate manifold of low-lying excitations. Comment: 16 pages, 16 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevB.105.064420 |
| URL الوصول: | http://arxiv.org/abs/2110.07958 |
| رقم الانضمام: | edsarx.2110.07958 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevB.105.064420 |
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