Quantum tunneling of the magnetization in the Ising chain compound Ca3Co2O6
Quantum tunneling of the magnetization in the Ising chain compound Ca3Co2O6
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DOI：
10.1039/b316717h
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发表时间：
2004-03
影响因子：
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通讯作者：
A. Maignan;V. Hardy;Sylvie Hébert;M. Drillon;M R Lees;O. Petrenko;D. Paul;D. Khomskii
中科院分区：
文献类型：
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作者：
A. Maignan;V. Hardy;Sylvie Hébert;M. Drillon;M R Lees;O. Petrenko;D. Paul;D. Khomskii
Ca3Co2O6自旋链化合物的磁性行为表现为其铁磁链具有较大的伊辛类特征，这些铁磁链设置在三角形晶格上，是反铁磁耦合的。在低温T < 7 K时，三维反铁磁态演化为自旋冻结态。在此温度范围内，磁场驱动的单晶（H //链）磁化强度呈阶梯变化。这些步骤以施加磁场的规则间隔Hstep = 1.2 T发生，使人联想到分子基磁体磁化（QTM）的量子隧穿。磁化弛豫实验也有力地支持这种量子现象的发生。这是第一次在属于A3BB 'O6化合物大家族的磁性氧化物中观察到QTM，为研究与分子磁体截然不同的材料中的量子效应提供了新的机会。
The magnetic behavior of the Ca3Co2O6 spin chain compound is characterized by a large Ising-like character of its ferromagnetic chains, set on a triangular lattice, that are antiferromagnetically coupled. At low temperature, T < 7 K, the 3D antiferromagnetic state evolves towards a spin frozen state. In this temperature range, magnetic field driven magnetization of single crystals (H // chains) exhibits stepped variations. The occurrence of these steps at regular intervals of the applied magnetic field, Hstep = 1.2 T, is reminiscent of the quantum tunneling of the magnetization (QTM) of molecular based magnets. Magnetization relaxation experiments also strongly support the occurrence of this quantum phenomenon. This first observation of QTM in a magnetic oxide belonging to the large family of A3BB′O6 compounds opens new opportunities to study a quantum effect in a very different class of materials from molecular magnets.