Journal
PHYSICAL REVIEW LETTERS
Volume 108, Issue 24, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.108.247213
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Funding
- Spanish MINECO [MAT2009-13977-C03, MAT2007-61584, MAT2011-23861]
- EU (Project ELFOS)
- EU (ERC Advanced Grant SPINMOL)
- Generalidad Valenciana (Prometeo Programme)
- Gobierno de Aragon (Project MOLCHIP)
- Spanish MINECO (CONSOLIDER project on Molecular Nanoscience)
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We report ac susceptibility and continuous wave and pulsed EPR experiments performed on GdW10 and GdW30 polyoxometalate clusters, in which a Gd3+ ion is coordinated to different polyoxometalate moieties. Despite the isotropic character of gadolinium as a free ion, these molecules show slow magnetic relaxation at very low temperatures, characteristic of single molecule magnets. For T less than or similar to 200 mK, the spin-lattice relaxation becomes dominated by pure quantum tunneling events, with rates that agree quantitatively with those predicted by the Prokof'ev and Stamp model [ Phys. Rev. Lett. 80, 5794 (1998)]. The sign of the magnetic anisotropy, the energy level splittings, and the tunneling rates strongly depend on the molecular structure. We argue that GdW30 molecules are also promising spin qubits with a coherence figure of merit Q(M) greater than or similar to 50.
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