Structural and magnetic properties of mixed valent Ca2MnTiO6

被引:0
|
作者
Borole, Smita [1 ]
Samanta, Soumen [2 ]
Bhattacharya, Shovit [2 ,3 ]
Rayaprol, Sudhindra [1 ]
机构
[1] UGC DAE Consortium Sci Res Mumbai Ctr, CFB 246C,BARC Campus, Mumbai 400085, Maharashtra, India
[2] Bhabha Atom Res Ctr, Tech Phys Div, Mumbai 400085, India
[3] Homi Bhabha Natl Inst, Mumbai 400094, India
基金
新加坡国家研究基金会;
关键词
Double perovskites; Magnetic frustration; Neutron diffraction; XPS; Mixed valence;
D O I
10.1016/j.jmmm.2024.172328
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The compound Ca2MnTiO6, synthesized using a two-step solid-state reaction method, has been studied for its structural, spectroscopic (XPS) and magnetic properties, as part of our efforts to understand the correlation between mixed metal oxide bonds and magnetism in double perovskite oxides. Room temperature diffraction studies shows that the compound is in orthorhombic structure at room temperature and remains so till low temperatures, although the variation in global instability index (GII) indicated little instability of the structure as the temperature is lowered from room temperature (similar to 300 K) to 3 K. The compound exhibits interesting behavior in magnetic susceptibility, as it exhibits magnetization reversal or negative magnetic susceptibility at low applied fields which turns positive for higher fields. Magnetic susceptibility also exhibits two anomalies at T-N1 similar to 8.2 K and another one around, T-N2, between 121 - 124 K. Magnetization as a function of field reveals weak antiferromagnetism in the system, as M varies non-linearly, but sluggishly below T<150 K, with no signature of saturation with respect to H. Overall, magnetization studies show that there is inherent magnetic frustration in the system and lack of long-range magnetic order, which is supported by low temperature neutron diffraction studies too. The XPS studies quantify the oxidation states of mixed valent Mn and Ti. A comparison of the structural and physical properties of double perovskite compound is presented here to understand the strong correlation between structural, spectroscopic and magnetic properties.
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页数:9
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