Persistent Spin Dynamics in the $S=1/2$ V$_{15}$ Molecular Nano-Magnet

Details Persistent Spin Dynamics in the $S=1/2$ V$_{15}$ Molecular Nano-Magnet Persistent Spin Dynamics in the $S=1/2$ V$_{15}$ Molecular Nano-Magnet

2008-05-14

arxiv.org/abs/0805.2164v1

Phys. Rev. B 77, 214415 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Accepted for publication in Phys. Rev. B, 5 pages, 5 figure

Scientific paper

10.1103/PhysRevB.77.214415

We present muon spin lattice relaxation measurements in the V15 spin 1/2 molecular nano-magnet. We find that the relaxation rate in low magnetic fields (<5 kG) is temperature independent below ~10 K, implying that the molecular spin is dynamically fluctuating down to 12 mK. These measurements show that the fluctuation time increases as the temperature is decreased and saturates at a value of ~6 nsec at low temperatures. The fluctuations are attributed to V15 molecular spin dynamics perpendicular to the applied magnetic field direction, induced by coupling between the molecular spin and nuclear spin bath in the system.

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