Quantum disordered ground state and relative proximity to an exactly solvable model in the frustrated magnet CeMgAl$_{11}$O$_{19}$
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| Main Authors: | , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866915350850830336 |
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| author | Bastien, G. Eliáš, A. Anderle, V. Kancko, A. Corrêa, C. A. Kumar, S. Proschek, P. Prokleška, J. Nádherný, L. Sedmidubský, D. Treu, T. Gegenwart, P. Kratochvílová, M. Žonda, M. Colman, R. H. |
| author_facet | Bastien, G. Eliáš, A. Anderle, V. Kancko, A. Corrêa, C. A. Kumar, S. Proschek, P. Prokleška, J. Nádherný, L. Sedmidubský, D. Treu, T. Gegenwart, P. Kratochvílová, M. Žonda, M. Colman, R. H. |
| contents | The magnetic properties of the triangular magnet CeMgAl$_{11}$O$_{19}$ were investigated by magnetization and specific heat measurements down to $T=0.03\,$K on single crystals grown by the floating zone method. The formation of effective spins $S_\mathrm{eff}= 1/2$ below $T < 10$\,K was confirmed both by DFT calculations and specific heat measurements. No magnetic order was found down to $T=0.03\,$K despite the formation of magnetic correlations observed in specific heat. The measured magnetization was compared with DMRG computation and their agreement supports the proposal of a strongly anisotropic magnetic interaction antiferromagnetically coupling the spin components in the $ab$ plane and ferromagnetically coupling the spin component along the $c$ axis. However, our quantitative study of the magnetization indicates a weaker proximity to quantum criticality between ferromagnetism and antiferromagnetism than the previous inelastic neutron scattering study. Finally, we propose that the absence of magnetic order in CeMgAl$_{11}$O$_{19}$ would most probably be related to the structural disorder revealed by single-crystal X-ray diffraction. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2506_16207 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Quantum disordered ground state and relative proximity to an exactly solvable model in the frustrated magnet CeMgAl$_{11}$O$_{19}$ Bastien, G. Eliáš, A. Anderle, V. Kancko, A. Corrêa, C. A. Kumar, S. Proschek, P. Prokleška, J. Nádherný, L. Sedmidubský, D. Treu, T. Gegenwart, P. Kratochvílová, M. Žonda, M. Colman, R. H. Strongly Correlated Electrons The magnetic properties of the triangular magnet CeMgAl$_{11}$O$_{19}$ were investigated by magnetization and specific heat measurements down to $T=0.03\,$K on single crystals grown by the floating zone method. The formation of effective spins $S_\mathrm{eff}= 1/2$ below $T < 10$\,K was confirmed both by DFT calculations and specific heat measurements. No magnetic order was found down to $T=0.03\,$K despite the formation of magnetic correlations observed in specific heat. The measured magnetization was compared with DMRG computation and their agreement supports the proposal of a strongly anisotropic magnetic interaction antiferromagnetically coupling the spin components in the $ab$ plane and ferromagnetically coupling the spin component along the $c$ axis. However, our quantitative study of the magnetization indicates a weaker proximity to quantum criticality between ferromagnetism and antiferromagnetism than the previous inelastic neutron scattering study. Finally, we propose that the absence of magnetic order in CeMgAl$_{11}$O$_{19}$ would most probably be related to the structural disorder revealed by single-crystal X-ray diffraction. |
| title | Quantum disordered ground state and relative proximity to an exactly solvable model in the frustrated magnet CeMgAl$_{11}$O$_{19}$ |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2506.16207 |