English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

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

MPS-Authors
/persons/resource/persons126777

Nath,  R.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126888

Tsirlin,  A. A.
Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126685

Khuntia,  P.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126671

Janson,  O.
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126605

Förster,  T.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126528

Baenitz,  M.
Michael Baenitz, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126819

Rosner,  H.
Helge Rosner, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

Locator
There are no locators available
Fulltext (public)
There are no public fulltexts available
Supplementary Material (public)
There is no public supplementary material available
Citation

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.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0015-1EA2-3
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.