Dynamical magnetism in the disordered cubic lattice material $γ$-${\rm Ba}_{3}{\rm CoNb}_{2}{\rm O}_{9}$
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| Main Authors: | , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| author | Xu, Fanjun Feyerherm, Ralf Glittum, Cecilie Hicken, Thomas J. Luetkens, Hubertus Krieger, Jonas A. Aguilar-Maldonado, Cintli Luther, Sven Saunders, Lucy K. Ritter, Clemens Fouquet, Peter Russina, Margarita Prokes, Karel Islam, A. T. M. Nazmul Lake, Bella |
| author_facet | Xu, Fanjun Feyerherm, Ralf Glittum, Cecilie Hicken, Thomas J. Luetkens, Hubertus Krieger, Jonas A. Aguilar-Maldonado, Cintli Luther, Sven Saunders, Lucy K. Ritter, Clemens Fouquet, Peter Russina, Margarita Prokes, Karel Islam, A. T. M. Nazmul Lake, Bella |
| contents | $γ$-${\rm Ba}_{3}{\rm CoNb}_{2}{\rm O}_{9}$ realizes a disordered simple-cubic spin-$1/2$ lattice in which Co$^{2+}$ ions randomly occupy one third of the sites, placing the system close to the site-percolation threshold for magnetic order. Specific-heat, susceptibility, neutron spin-echo, and muon spin-rotation measurements reveal a broad thermodynamic crossover, short-range magnetic correlations, and persistent fast spin dynamics down to at least 0.1~K, with no evidence for static order or conventional spin-glass freezing. Monte Carlo simulations yield a broad distribution of orphan spins, finite clusters, and an infinite network. The calculated orphan-spin fraction ($\approx 8.8\%$) agrees well with the weakly correlated spin fraction inferred from magnetization ($\approx 8.2\%$). Exact diagonalization of a diluted $S = 1/2$ Heisenberg model captures the broad magnetic specific-heat anomaly and supports the coexistence of weakly and strongly correlated spin environments. These results support a picture in which spin-$1/2$ quantum fluctuations, together with dilution and proximity to the percolation threshold, can support a disorder-driven dynamical state with short-range correlations in three dimensions, distinct from both classical spin glasses and geometrically frustrated quantum spin liquids. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2604_18794 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Dynamical magnetism in the disordered cubic lattice material $γ$-${\rm Ba}_{3}{\rm CoNb}_{2}{\rm O}_{9}$ Xu, Fanjun Feyerherm, Ralf Glittum, Cecilie Hicken, Thomas J. Luetkens, Hubertus Krieger, Jonas A. Aguilar-Maldonado, Cintli Luther, Sven Saunders, Lucy K. Ritter, Clemens Fouquet, Peter Russina, Margarita Prokes, Karel Islam, A. T. M. Nazmul Lake, Bella Strongly Correlated Electrons Materials Science $γ$-${\rm Ba}_{3}{\rm CoNb}_{2}{\rm O}_{9}$ realizes a disordered simple-cubic spin-$1/2$ lattice in which Co$^{2+}$ ions randomly occupy one third of the sites, placing the system close to the site-percolation threshold for magnetic order. Specific-heat, susceptibility, neutron spin-echo, and muon spin-rotation measurements reveal a broad thermodynamic crossover, short-range magnetic correlations, and persistent fast spin dynamics down to at least 0.1~K, with no evidence for static order or conventional spin-glass freezing. Monte Carlo simulations yield a broad distribution of orphan spins, finite clusters, and an infinite network. The calculated orphan-spin fraction ($\approx 8.8\%$) agrees well with the weakly correlated spin fraction inferred from magnetization ($\approx 8.2\%$). Exact diagonalization of a diluted $S = 1/2$ Heisenberg model captures the broad magnetic specific-heat anomaly and supports the coexistence of weakly and strongly correlated spin environments. These results support a picture in which spin-$1/2$ quantum fluctuations, together with dilution and proximity to the percolation threshold, can support a disorder-driven dynamical state with short-range correlations in three dimensions, distinct from both classical spin glasses and geometrically frustrated quantum spin liquids. |
| title | Dynamical magnetism in the disordered cubic lattice material $γ$-${\rm Ba}_{3}{\rm CoNb}_{2}{\rm O}_{9}$ |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2604.18794 |