Magnetic structure and dynamics of a strongly one-dimensional cobalt(II) metal-organic framework

Article

关键词: NEUTRON-DIFFRACTION;    HYBRID COMPOUNDS;    COMPOUND;    SOLIDS;    ORDER;    CHAIN;    STATE;    CO2+;   

DOI  :  10.1103/PhysRevB.89.104413

来源: SCIE

【 摘 要 】

We investigate the magnetism of the Co-4(II)(OH)(2)(C10H16O4)(3) metal-organic framework, which displays complex inorganic chains separated from each other by distances of 1 to 2 nm and orders at 5.4 K. The zero-field magnetic structure is determined using neutron powder diffraction: it is mainly antiferromagnetic but possesses a ferromagnetic component along the c axis. This magnetic structure persists in presence of a magnetic field. Alternating current susceptibility measurements confirm the existence of a single thermally activated regime over seven decades in frequency (E/k(B) approximate to 64 K), whereas time-dependent relaxation of the magnetization after saturation in an external field leads to a two times smaller energy barrier. These experiments probe the slow dynamics of domain walls within the chains: we propose that the ac measurements are sensitive to the motion of existing domain walls within the chains, while the magnetization measurements are governed by the creation of domain walls.

【 授权许可】

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