电子顺磁共振
反铁磁性
接受者
顺磁性
化学
磁化
铁磁性
离子键合
离子
兴奋剂
凝聚态物理
脉冲电子顺磁共振
电子核双共振
核磁共振
材料科学
物理
自旋回波
磁场
磁共振成像
医学
有机化学
量子力学
放射科
作者
K. Ganesan,S. S. Rao,S. V. Bhat,H. L. Bhat
摘要
We report on the X-band (∼9.43 GHz) electron paramagnetic resonance (EPR) investigations carried out on polycrystalline Ga1−xMnxSb (x=0.02). A strong EPR signal with an effective g factor (geff) close to 2.00 was observed, suggesting that the ionic state of Mn which replaces Ga ion in the lattice, is Mn2+ attributable to ΔM=1 transition of the ionized Mn acceptor A−, Mn(3d5). The apparent absence of EPR signal, typical for neutral Mn acceptor at g=2.7 suggests either no such centers are present or the signal broadens beyond detection limit. The temperature dependent EPR studies combined with dc magnetization data suggest the possible coexistence of antiferromagnetic and ferromagnetic phases at very low temperatures.
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