Spin liquid properties of the kagome material Cu$_3$(HOTP)$_2$
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arXiv
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| Auteurs principaux: | , , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866909406548983808 |
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| author | Pratt, F. L. Lopez-Alcala, D. Garcia-Lopez, V. Clemente-Leon, M. Baldovi, J. J. Coronado, E. |
| author_facet | Pratt, F. L. Lopez-Alcala, D. Garcia-Lopez, V. Clemente-Leon, M. Baldovi, J. J. Coronado, E. |
| contents | The metal-organic-framework (MOF) compound Cu$_3$(HOTP)$_2$, a.k.a. Cu$_3$(HHTP)$_2$, is a small-gap semiconductor containing a kagome lattice of antiferromagnetically coupled $S$=1/2 Cu$^\mathrm{II}$ spins with intra-layer nearest-neighbor exchange coupling $J \sim $ 2 K. The intra-layer $J$ value obtained from DFT+U calculations is shown to match with the experimental value for reasonable values of U. Muon spin relaxation confirms no magnetic ordering down to 50~mK and sees spin fluctuations diffusing on a 2D lattice, consistent with a quantum spin liquid (QSL) ground state being present within highly decoupled kagome layers. Reduction of the spin diffusion rate on cooling from the paramagnetic region to the low-temperature QSL region reflects quantum entanglement. It is also found that the layers become more strongly decoupled in the low-temperature QSL region. Comparison of results for the spin diffusion, magnetic susceptibility and specific heat in the QSL region suggests close proximity to a quantum critical point and a large density of low energy spinless electronic excitations. A Z$_2$-linear Dirac model for the spin excitations of the QSL is found to provide the best match with experiment. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_18518 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Spin liquid properties of the kagome material Cu$_3$(HOTP)$_2$ Pratt, F. L. Lopez-Alcala, D. Garcia-Lopez, V. Clemente-Leon, M. Baldovi, J. J. Coronado, E. Strongly Correlated Electrons The metal-organic-framework (MOF) compound Cu$_3$(HOTP)$_2$, a.k.a. Cu$_3$(HHTP)$_2$, is a small-gap semiconductor containing a kagome lattice of antiferromagnetically coupled $S$=1/2 Cu$^\mathrm{II}$ spins with intra-layer nearest-neighbor exchange coupling $J \sim $ 2 K. The intra-layer $J$ value obtained from DFT+U calculations is shown to match with the experimental value for reasonable values of U. Muon spin relaxation confirms no magnetic ordering down to 50~mK and sees spin fluctuations diffusing on a 2D lattice, consistent with a quantum spin liquid (QSL) ground state being present within highly decoupled kagome layers. Reduction of the spin diffusion rate on cooling from the paramagnetic region to the low-temperature QSL region reflects quantum entanglement. It is also found that the layers become more strongly decoupled in the low-temperature QSL region. Comparison of results for the spin diffusion, magnetic susceptibility and specific heat in the QSL region suggests close proximity to a quantum critical point and a large density of low energy spinless electronic excitations. A Z$_2$-linear Dirac model for the spin excitations of the QSL is found to provide the best match with experiment. |
| title | Spin liquid properties of the kagome material Cu$_3$(HOTP)$_2$ |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2411.18518 |