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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2407.20081 |
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| _version_ | 1866914891559862272 |
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| author | Tu, Chengpeng Ma, Zhen Wang, Hanru Jiao, Yihan Dai, Dongzhe Li, Shiyan |
| author_facet | Tu, Chengpeng Ma, Zhen Wang, Hanru Jiao, Yihan Dai, Dongzhe Li, Shiyan |
| contents | In the search of quantum spin liquid (QSLs), spin-1/2 triangular-lattice Heisenberg antiferromagnets (TLHAFs) have always been viewed as fertile soils. Despite the true magnetically-ordered ground state, anisotropy has been considered to play a significant role in stabilizing a QSL state. However, the nature and ground state of the most anisotropic case, the triangular-lattice Ising antiferromagnet (TLIAF), remains elusive and controversial. Here, we report specific heat and thermal conductivity measurements on a newly-discovered Ising-type QSL candidate PrMgAl11O19. At zero field, the magnetic specific heat shows a quadratic temperature dependence. On the contrary, no direct positive magnetic contribution to thermal conductivity was detected, ruling out the presence of mobile gapless fermionic excitations. Further analysis of phonon thermal conductivity reveals that the phonons are strongly scattered by thermally-activated magnetic excitations out of a gap, which exhibits a linear dependence with magnetic field. These results demonstrate that the spin-1/2 TLIAF PrMgAl11O19 has a gapped Z2 QSL ground state. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_20081 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Gapped quantum spin liquid in a triangular-lattice Ising-type antiferromagnet PrMgAl11O19 Tu, Chengpeng Ma, Zhen Wang, Hanru Jiao, Yihan Dai, Dongzhe Li, Shiyan Strongly Correlated Electrons Materials Science Superconductivity In the search of quantum spin liquid (QSLs), spin-1/2 triangular-lattice Heisenberg antiferromagnets (TLHAFs) have always been viewed as fertile soils. Despite the true magnetically-ordered ground state, anisotropy has been considered to play a significant role in stabilizing a QSL state. However, the nature and ground state of the most anisotropic case, the triangular-lattice Ising antiferromagnet (TLIAF), remains elusive and controversial. Here, we report specific heat and thermal conductivity measurements on a newly-discovered Ising-type QSL candidate PrMgAl11O19. At zero field, the magnetic specific heat shows a quadratic temperature dependence. On the contrary, no direct positive magnetic contribution to thermal conductivity was detected, ruling out the presence of mobile gapless fermionic excitations. Further analysis of phonon thermal conductivity reveals that the phonons are strongly scattered by thermally-activated magnetic excitations out of a gap, which exhibits a linear dependence with magnetic field. These results demonstrate that the spin-1/2 TLIAF PrMgAl11O19 has a gapped Z2 QSL ground state. |
| title | Gapped quantum spin liquid in a triangular-lattice Ising-type antiferromagnet PrMgAl11O19 |
| topic | Strongly Correlated Electrons Materials Science Superconductivity |
| url | https://arxiv.org/abs/2407.20081 |