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Room temperature antiferromagnetic ordering in chemically prepared nanocrystalline Co-doped neodymium oxide (Nd1.90Co0.10O3-δ)
Journal of Alloys and Compounds ( IF 6.2 ) Pub Date : 2018-04-11
B.J. Sarkar, M. Dalal, A. Mitra, J. Mandal, A. Bandyopadhyay, P.K. Chakrabarti

Nanocrystalline sample of Co-doped neodymium oxide (Nd1.90Co0.10O3-δ, NCO) is prepared by co-precipitation method. Rietveld analysis of the X-ray diffractograms confirms the formation of desired phase and complete substitution of Co-ions in Nd2O3 lattice. Analyses of transmission electron microscopy and the Raman spectra of NCO recorded at room temperature also substantiate this fact. Magnetization (M) as a function of temperature (T) and magnetic field (H) data shows that antiferromagnetic (AFM) ordering is introduced in the sample at room temperature and below ∼ 100 K, a transition from AFM to ferromagnetic (FM) phase is observed. Susceptibility vs. temperature (χ-T) curve in the temperature range of 300–100 K is successfully fitted by Johnston formula which indicates the coexistence of AFM and paramagnetic (PM) phase and below 100 K, the M-T curve is well fitted by a combined equation generated from three dimensional (3D) spin wave model and Curie-Weiss law which confirms the presence of mixed state of FM and PM phases. Oxygen vacancy mediated ferromagnetism plays an important role behind the onset of FM phase.



中文翻译:

化学制备的纳米晶共掺杂氧化钕(Nd 1.90 Co 0.10 O3 )中的室温反铁磁有序

通过共沉淀法制备了钴掺杂的氧化钕(Nd 1.90 Co 0.10 O3 ,NCO)的纳米晶样品。X射线衍射图的Rietveld分析证实了所需相的形成以及Nd 2 O 3中Co离子的完全取代格子。透射电子显微镜的分析和室温下记录的NCO拉曼光谱也证实了这一事实。磁化强度(M)作为温度(T)和磁场(H)的函数,表明在室温和〜100 K以下时将反铁磁(AFM)有序引入样品中,这是从AFM到铁磁(FM)相的过渡被观察到。约翰斯顿公式成功拟合了在300–100 K温度范围内的磁化率与温度(χ-T)曲线,表明AFM和顺磁(PM)相并存,并且在100 K以下,MT曲线通过由三维(3D)自旋波模型和居里-魏斯定律产生的组合方程式,证实了FM和PM相的混合状态的存在。

更新日期:2018-04-11
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