具有单电子铽-铽键的氮杂富勒烯Tb@C₅₉N中高的磁化阻挡温度和巨大矫顽力

High Blocking Temperature of Magnetization and Giant Coercivity in the Azafullerene Tb @C N with a Single-Electron Terbium-Terbium Bond.

作者信息

Velkos Georgios, Krylov Denis S, Kirkpatrick Kyle, Spree Lukas, Dubrovin Vasilii, Büchner Bernd, Avdoshenko Stanislav M, Bezmelnitsyn Valeriy, Davis Sean, Faust Paul, Duchamp James, Dorn Harry C, Popov Alexey A

机构信息

Leibniz Institute for Solid State and Materials Research, Helmholtzstrasse 20, 01069, Dresden, Germany.

Center for Quantum Nanoscience, Institute for Basic Science (IBS), Seoul, Republic of Korea.

出版信息

Angew Chem Int Ed Engl. 2019 Apr 23;58(18):5891-5896. doi: 10.1002/anie.201900943. Epub 2019 Mar 27.

The azafullerene Tb @C N is found to be a single-molecule magnet with a high 100-s blocking temperature of magnetization of 24 K and large coercivity. Tb magnetic moments with an easy-axis single-ion magnetic anisotropy are strongly coupled by the unpaired spin of the single-electron Tb-Tb bond. Relaxation of magnetization in Tb @C N below 15 K proceeds via quantum tunneling of magnetization with the characteristic time τ =16 462±1230 s. At higher temperature, relaxation follows the Orbach mechanism with a barrier of 757±4 K, corresponding to the excited states, in which one of the Tb spins is flipped.