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  Magnetization and spin dynamics of the spin S=1/2 hourglass nanomagnet Cu5(OH)2(NIPA)4•10H2O

Nath, R., Tsirlin, A. A., Khuntia, P., Janson, O., Förster, T., Padmanabhan, M., et al. (2013). Magnetization and spin dynamics of the spin S=1/2 hourglass nanomagnet Cu5(OH)2(NIPA)4•10H2O. Physical Review B, 87(21): 214417, pp. 1-8. doi:10.1103/PhysRevB.87.214417.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0015-1EA2-3 Version Permalink: http://hdl.handle.net/21.11116/0000-0000-FF1C-3
Genre: Journal Article

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 Creators:
Nath, R.1, Author              
Tsirlin, A. A.2, Author              
Khuntia, P.3, Author              
Janson, O.4, Author              
Förster, T.3, Author              
Padmanabhan, M., Author
Li, J., Author
Skourski, Y., Author
Baenitz, M.5, Author              
Rosner, H.6, Author              
Rousochatzakis, I., Author
Affiliations:
1Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863404              
2Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863405              
3Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              
4Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863445              
5Michael Baenitz, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863471              
6Helge Rosner, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863450              

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 Abstract: We report a combined experimental and theoretical study of the spin S = 1/2 nanomagnet Cu-5(OH)(2)(NIPA)(4)center dot 10H(2)O (Cu-5-NIPA). Using thermodynamic, electron spin resonance, and H-1 nuclear magnetic resonance measurements on one hand, and ab initio density-functional band-structure calculations, exact diagonalizations, and a strong-coupling theory on the other, we derive a microscopic magnetic model of Cu-5-NIPA and characterize the spin dynamics of this system. The elementary fivefold Cu2+ unit features an hourglass structure of two corner-sharing scalene triangles related by inversion symmetry. Our microscopic Heisenberg model comprises one ferromagnetic and two antiferromagnetic exchange couplings in each triangle, stabilizing a single spin S = 1/2 doublet ground state (GS), with an exactly vanishing zero-field splitting (by Kramers' theorem), and a very large excitation gap of Delta similar or equal to 68 K. Thus, Cu-5-NIPA is a good candidate for achieving long electronic spin relaxation (T-1) and coherence (T-2) times at low temperatures, in analogy to other nanomagnets with low-spin GS's. Of particular interest is the strongly inhomogeneous distribution of the GS magnetic moment over the five Cu2+ spins. This is a purely quantum-mechanical effect since, despite the nonfrustrated nature of the magnetic couplings, the GS is far from the classical collinear ferrimagnetic configuration. Finally, Cu-5-NIPA is a rare example of a S = 1/2 nanomagnet showing an enhancement in the nuclear spin-lattice relaxation rate 1/T-1 at intermediate temperatures.

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Language(s): eng - English
 Dates: 2013-06-14
 Publication Status: Published in print
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 Rev. Method: -
 Identifiers: eDoc: 668945
ISI: 000320389600001
DOI: 10.1103/PhysRevB.87.214417
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Title: Physical Review B
Source Genre: Journal
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Pages: - Volume / Issue: 87 (21) Sequence Number: 214417 Start / End Page: 1 - 8 Identifier: ISSN: 1098-0121