TOPICAL REVIEW: High-frequency electron spin resonance in magnetic systems
TOPICAL REVIEW: High-frequency electron spin resonance in magnetic systems
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专题评论：磁系统中的高频电子自旋共振
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
K. Katsumata
中科院分区：
文献类型：
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作者：
K. Katsumata
本文综述了高频电子自旋共振（ESR）技术在磁性材料研究中的最新进展。首先，我们展示了高频ESR对研究反铁磁材料的有用性，其中ESR频率和磁场在很大程度上取决于材料的交换相互作用和各向异性能量。接下来，我们回顾了近年来在自旋S = 1准一维海森堡反铁磁体（Q1D HAFs）和自旋-佩尔斯体系CuGeO3上进行的高频ESR实验。然后，我们回顾了在更复杂的体系上进行的ESR研究，例如具有键交替的S = 1 Q1D HAF，自旋阶梯化合物和准二维磁体。这些系统中的每一个都有量子起源的单线态基态和到最低激发态的能隙。在外加磁场作用下，这些体系表现出从非磁性到磁化状态的转变，并且在某些情况下发生了长程磁有序。为了直观地解释潜在的物理现象，人们付出了牺牲严谨的代价。
We review the recent progress in the study of magnetic materials using a high-frequency electron spin-resonance (ESR) technique. First, we show how useful high-frequency ESR is for studying antiferromagnetic materials, where the ESR frequency and magnetic field depend greatly on the exchange interaction and anisotropy energy of the materials. Next, we review the recent high-frequency ESR experiments made on spin S = 1 quasi-one-dimensional Heisenberg antiferromagnets (Q1D HAFs) and the spin-Peierls system CuGeO3. Then, we review the ESR studies performed on more complex systems, such as an S = 1 Q1D HAF with bond alternation, spin-ladder compounds and quasi-two-dimensional magnets. Each of these systems has a singlet ground state of quantum origin and an energy gap to the lowest excited state. On applying an external magnetic field, these systems show a transition from the non-magnetic to a magnetized state, and in some cases, long-range magnetic ordering occurs. Efforts are made to explain the underlying physics intuitively at the expense of rigour.