Detection and decoherence of level-crossing resonances of Li-8 in Cu

作者：Chow K H^*; Mansour A I; Fan I; Kiefl R F; Morris G D; Salman Z; Dunlop T; MacFarlane W A; Saadaoui H; Mosendz O; Kardasz B; Heinrich B; Jung J; Levy C D P; Pearson M R; Parolin T J; Wang D; Hossain M D; Song Q; Smadella M

来源：Physical Review B, 2012, 85(9): 092103.

DOI：10.1103/PhysRevB.85.092103

Level-crossing resonances are observed for spin-polarized Li-8 in copper at 200 K. The positions of the resonances as a function of magnetic field and crystal orientation are a precise measure of the induced quadrupolar interaction on the nearest-neighbor Cu spins and provide unambiguous evidence that Li-8 occupies a substitutional site. The resonances are detected as enhancements in the Li-8 spin relaxation rate and are much broader than predicted from a static spin Hamiltonian. A strong collision model is used to extract a decoherence time as a result of the dipolar coupling of the Li-8-Cu subsystem to the surrounding nuclear spin bath.

• 出版日期2012-3-20