Field Induced Spin-State Transition in LaCoO3
Field Induced Spin-State Transition in LaCoO3
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DOI：
10.1143/jpsj.78.093702
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发表时间：
2009-09
影响因子：
1.7
通讯作者：
Keisuke Sato;A. Matsuo;K. Kindo;Y. Kobayashi;K. Asai
中科院分区：
文献类型：
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作者：
Keisuke Sato;A. Matsuo;K. Kindo;Y. Kobayashi;K. Asai
LaCoO 3在低于25 K的60 T磁场下出现了由能级交叉引起的磁性转变，这与电子自旋共振实验确定的能量图一致。然而，与g = 3.35的钴离子的量有助于磁转变是样品依赖性和最多14%的总钴离子在LaCoO 3。我们发现，其余的Co离子也有助于磁化，这是一个最大值在100 K左右。我们分析了磁化假设两种Co物种，Co I和Co II，这两种都具有双基态。Co Ⅰ的磁激发态能量为135 K，g值为3.35; Co Ⅱ的磁激发态能量为250-260 K，g值为1.9-2.0。Co I离子与LaCoO 3的氧空位和表面有关。
The magnetization of LaCoO 3 shows a magnetic transition induced by level crossing at a magnetic field of 60 T below 25 K, which is consistent with the energy diagram determined from electron spin resonance experiments. However, the amount of Co ions with g = 3.35 contributing to the magnetic transition is sample-dependent and at most 14% of the total Co ions in LaCoO 3 . We found that the rest of the Co ions also contribute to the magnetization, which is a maximum at around 100 K. We analyzed the magnetization assuming two kinds of Co species, Co I and Co II , both of which have the nonmagnetic ground state. The energies and the g values of the magnetic excited states are 135 K and 3.35 for Co I , and 250–260 K and 1.9–2.0 for Co II , respectively. Co I ions are suggested to be associated with oxygen vacancies and the surface of LaCoO 3 .