分子磁性体に-spin.phys.s.u.pptVIP

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2016-10-12 发布于天津
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分子磁性体に-spin.phys.s.u.ppt

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分子磁性体に-spin.phys.s.u

Quantum tunnelingbyHyperfine interactionOrigin of adiabatic change of the magnetization and the symmetry of the molecules Seiji Miyashita, Hans de Raedt and Kristel Michielsen Univ. of Tokyo and Groningen Univ. Nonadiabatic Transition Smooth magnetization processin the ground state Origin of the adiabatic change Dzyaloshinskii-Moriya interaction V15 Fe-rings Fe10,etc. Cu-Benzoate (1DH) SrCu2(BO3)2 (SS) Anisotropy of DM interaction Decoupling of states Energy structure Control of Quantum StateAdiabatic Transition DM interaction Energy structure with DM Angle dependence of the energy levels General form of DM interaction? T. A. Kaplan: Z. Phys. B-Cond. 49 (1983) 313. L. Shekhtman, et al. PRL 69 (1992) 836. PRB 47 (1993) 174 ５spin-model V15 structure Anisotropy of the Gap: Hard axis Anisotropy of the Gap: Easy axis Microscopic Origin of Gap forMn12 with DM interaction Directionally Independent Energy Gap due toHyperfine interaction Change of state Triangle system M(t) from the ground state Finite temperature M(t) under a sweeping field Finite temperature Apparent LZS transition Transition from 1/2 3/2 Hysteresis in field sweep　 Coherence at the crossing Resonance on the AC field Non-trivial Resonance Nontrivial resonance Decoherence Dissipation Effect Quantum Master Equation General formulation Field sweeping with thermal bath Nonadiabatic Tr. Heat-inflow Relation to the longitudinal relaxation Effects of environments Phonon-bottleneck effect (MFE)Electron spin system + DMHx sweeping Effects on the Phonon-bottleneck effect (Magnetic Foehn effect) Hz:sweep 45-degree Angle dependence of the energy levels Reaction to the nuclear spin Temperature effect Fe ring Fe3+ plays a role of a localized spin with S=5/2 and L=0. Fe10 A set of D vectors from static regular structure Anisotropy of g-tensor Anisotropy of single ion Oscillation of methyl groups Thank you for your attention Quantum Control of state: No