Pressure tuning of Kitaev spin liquid candidate Na$_3$Co$_2$SbO$_6$
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arXiv
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| Autori principali: | , , , , , , , , , , , , , , , , , , , |
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| Natura: | Preprint |
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2025
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| author | Poldi, E. H. T. Tartaglia, R. Fabbris, G. Nguyen, N. Park, H. Liu, Z. van Veenendaal, M. Kumar, R. Jose, G. Samanta, S. Bi, W. Xiao, Y. Popov, D. Wu, Y. Kim, J. -W. Zheng, H. Yan, J. Mitchell, J. F. Hemley, R. J. Haskel, D. |
| author_facet | Poldi, E. H. T. Tartaglia, R. Fabbris, G. Nguyen, N. Park, H. Liu, Z. van Veenendaal, M. Kumar, R. Jose, G. Samanta, S. Bi, W. Xiao, Y. Popov, D. Wu, Y. Kim, J. -W. Zheng, H. Yan, J. Mitchell, J. F. Hemley, R. J. Haskel, D. |
| contents | The search for Kitaev's quantum spin liquid (KQSL) state in real materials has recently expanded with the prediction that honeycomb lattices of divalent, high-spin cobalt ions could host the dominant bond-dependent exchange interactions required to stabilize the elusive entangled quantum state. The layered honeycomb Na$_3$Co$_2$SbO$_6$ has been singled out as a leading candidate provided that the trigonal crystal field acting on Co $3d$ orbitals, which enhances non-Kitaev exchange interactions between $J_{\rm eff}=\frac{1}{2}$ spin-orbital pseudospins, is reduced. We find that applied pressure leads to anisotropic compression of the layered structure, significantly reducing the trigonal distortion of CoO$_6$ octahedra. A strong enhancement of ferromagnetic correlations between pseudospins is observed in the spin-polarized (3 Tesla) phase up to about 60 GPa. Higher pressures drive a spin transition into a low-spin state destroying the $J_{\rm eff}=\frac{1}{2}$ local moments required to map the spin Hamiltonian into Kitaev's model. The spin transition strongly suppresses the low-temperature magnetic susceptibility and appears to stabilize a paramagnetic phase driven by frustration. Although applied pressure fails to realize a KQSL state, the possible emergence of frustrated magnetism of localized, low-spin $S=\frac{1}{2}$ moments opens the door for exploration of novel magnetic quantum states in compressed honeycomb lattices of divalent cobaltates. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_20064 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Pressure tuning of Kitaev spin liquid candidate Na$_3$Co$_2$SbO$_6$ Poldi, E. H. T. Tartaglia, R. Fabbris, G. Nguyen, N. Park, H. Liu, Z. van Veenendaal, M. Kumar, R. Jose, G. Samanta, S. Bi, W. Xiao, Y. Popov, D. Wu, Y. Kim, J. -W. Zheng, H. Yan, J. Mitchell, J. F. Hemley, R. J. Haskel, D. Strongly Correlated Electrons The search for Kitaev's quantum spin liquid (KQSL) state in real materials has recently expanded with the prediction that honeycomb lattices of divalent, high-spin cobalt ions could host the dominant bond-dependent exchange interactions required to stabilize the elusive entangled quantum state. The layered honeycomb Na$_3$Co$_2$SbO$_6$ has been singled out as a leading candidate provided that the trigonal crystal field acting on Co $3d$ orbitals, which enhances non-Kitaev exchange interactions between $J_{\rm eff}=\frac{1}{2}$ spin-orbital pseudospins, is reduced. We find that applied pressure leads to anisotropic compression of the layered structure, significantly reducing the trigonal distortion of CoO$_6$ octahedra. A strong enhancement of ferromagnetic correlations between pseudospins is observed in the spin-polarized (3 Tesla) phase up to about 60 GPa. Higher pressures drive a spin transition into a low-spin state destroying the $J_{\rm eff}=\frac{1}{2}$ local moments required to map the spin Hamiltonian into Kitaev's model. The spin transition strongly suppresses the low-temperature magnetic susceptibility and appears to stabilize a paramagnetic phase driven by frustration. Although applied pressure fails to realize a KQSL state, the possible emergence of frustrated magnetism of localized, low-spin $S=\frac{1}{2}$ moments opens the door for exploration of novel magnetic quantum states in compressed honeycomb lattices of divalent cobaltates. |
| title | Pressure tuning of Kitaev spin liquid candidate Na$_3$Co$_2$SbO$_6$ |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2503.20064 |