A hysteresis phenomenon in NMR spectra of molecular nanomagnets Fe8: a resonant quantum tunneling system

A molecular nanomagnet Fe8 with a total spin S=10 in the ground state attracts much attention as a substance which exhibits the quantum tunneling of magnetization below 300 mK . We performed 1 H NMR measurements for a single crystal of Fe8 in temperature range between 20 and 800 mK . The spectra bel...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2003-05, Vol.329, p.1187-1188
Main Authors: Yamasaki, Tomoaki, Ueda, Miki, Maegawa, Satoru
Format: Article
Language:English
Subjects:
Molecular magnet
Nanomagnet
NMR
Quantum tunneling
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Summary:A molecular nanomagnet Fe8 with a total spin S=10 in the ground state attracts much attention as a substance which exhibits the quantum tunneling of magnetization below 300 mK . We performed 1 H NMR measurements for a single crystal of Fe8 in temperature range between 20 and 800 mK . The spectra below 300 mK strongly depend on the sequence of the applied field and those in the positive and negative fields are not symmetric about zero field, while they are symmetric above 300 mK . We discuss the origin of this hysteresis phenomenon, relating to the initial spin state of molecules, the resonant quantum tunneling and the nuclear spin relaxation process.
ISSN:0921-4526
1873-2135
DOI:10.1016/S0921-4526(02)02106-3