Quantum spin liquid ground state in a rare-earth triangular antiferromagnet SmTa$_7$O$_{19}$
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2025
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| author | Bairwa, Dhanpal Bandyopadhyay, Abhisek Adroja, Devashibhai Stenning, G. B. G. Luetkens, Hubertus Hicken, Thomas James Krieger, Jonas A. Cibin, G. Rotter, M. Rayaprol, S. Babu, P. D. Elizabeth, Suja |
| author_facet | Bairwa, Dhanpal Bandyopadhyay, Abhisek Adroja, Devashibhai Stenning, G. B. G. Luetkens, Hubertus Hicken, Thomas James Krieger, Jonas A. Cibin, G. Rotter, M. Rayaprol, S. Babu, P. D. Elizabeth, Suja |
| contents | The rare-earth-based geometrically frustrated triangular magnets have attracted considerable attention due to the intricate interplay between strong spin-orbit coupling and the crystal electric field (CEF), which often leads to effective spin-1/2 degrees of freedom and therefore promotes strong quantum fluctuations at low temperatures, thus offering an excellent route to stabilize a quantum spin liquid (QSL) ground state. We have investigated the ground state magnetic properties of a polycrystalline sample of $\text{SmTa}_7\text{O}_{19}$ which we propose to have a gapless QSL ground state by employing powder X-ray diffraction (XRD), X-ray absorption spectroscopy (XAS), DC and AC-magnetic susceptibility, $M$ vs. $H$ isotherm, specific heat, and muon spin rotation/relaxation measurements ($μ$SR) down to 30 mK. The combined structural and electronic studies reveal the formation of an edge-sharing equilateral triangular lattice of Sm$^{3+}$ ions in $ab$ plane. The DC, AC magnetic susceptibility, and heat capacity measurements reveal that $\text{SmTa}_7\text{O}_{19}$ does not exhibit any long-range magnetic ordering transition down to 50 mK. The zero-field (ZF)-$μ$SR study strongly refutes the long-range magnetically ordered ground state and/or any partial spin-freezing down to at least 30 mK. The ZF-muon-spin relaxation rate is weakly temperature dependent between 50 and 20 K, rapidly increases below $\sim$20 K and saturates at low temperatures between 2 K and 30 mK, which has been attributed to a characteristic signature of QSL systems. Further, our longitudinal-field (LF)-$μ$SR measurements at 0.1 K reveal a dynamic nature of the magnetic ground state. In addition, our high-field specific heat data suggest a gapless nature of spin excitations in this compound. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_04631 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Quantum spin liquid ground state in a rare-earth triangular antiferromagnet SmTa$_7$O$_{19}$ Bairwa, Dhanpal Bandyopadhyay, Abhisek Adroja, Devashibhai Stenning, G. B. G. Luetkens, Hubertus Hicken, Thomas James Krieger, Jonas A. Cibin, G. Rotter, M. Rayaprol, S. Babu, P. D. Elizabeth, Suja Strongly Correlated Electrons The rare-earth-based geometrically frustrated triangular magnets have attracted considerable attention due to the intricate interplay between strong spin-orbit coupling and the crystal electric field (CEF), which often leads to effective spin-1/2 degrees of freedom and therefore promotes strong quantum fluctuations at low temperatures, thus offering an excellent route to stabilize a quantum spin liquid (QSL) ground state. We have investigated the ground state magnetic properties of a polycrystalline sample of $\text{SmTa}_7\text{O}_{19}$ which we propose to have a gapless QSL ground state by employing powder X-ray diffraction (XRD), X-ray absorption spectroscopy (XAS), DC and AC-magnetic susceptibility, $M$ vs. $H$ isotherm, specific heat, and muon spin rotation/relaxation measurements ($μ$SR) down to 30 mK. The combined structural and electronic studies reveal the formation of an edge-sharing equilateral triangular lattice of Sm$^{3+}$ ions in $ab$ plane. The DC, AC magnetic susceptibility, and heat capacity measurements reveal that $\text{SmTa}_7\text{O}_{19}$ does not exhibit any long-range magnetic ordering transition down to 50 mK. The zero-field (ZF)-$μ$SR study strongly refutes the long-range magnetically ordered ground state and/or any partial spin-freezing down to at least 30 mK. The ZF-muon-spin relaxation rate is weakly temperature dependent between 50 and 20 K, rapidly increases below $\sim$20 K and saturates at low temperatures between 2 K and 30 mK, which has been attributed to a characteristic signature of QSL systems. Further, our longitudinal-field (LF)-$μ$SR measurements at 0.1 K reveal a dynamic nature of the magnetic ground state. In addition, our high-field specific heat data suggest a gapless nature of spin excitations in this compound. |
| title | Quantum spin liquid ground state in a rare-earth triangular antiferromagnet SmTa$_7$O$_{19}$ |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2503.04631 |