论文标题
无序的polycrystalline散装SM $ _ {2} $ nimno $ _ {6} $ double double perovskite的磁性特性
Magnetic properties of disordered polycrystalline bulk Sm$ _{2} $NiMnO$ _{6} $ double perovskite
论文作者
论文摘要
已经研究了抗位点无序的SM $ _ {2} $ nimno $ _ {6} $ double Perovskite的结构，电子和磁性。 re $ _ {2} $ nimno $ _ {6} $（re：rarth）订购的双重钙钛矿通常被认为显示出两个独特的磁相变过，即在t = t $ _ {c} $ _ ni-o-mn超级交换时，在t = t $ _ {c} $ pramagnetic to to to to t = t $ _与Ni-MN网络的旋转耦合。在我们目前的研究中，我们观察到固有的B位疾病的存在导致额外的抗铁磁（AFM）耦合，通过NI-O-NI和MN-O-MN局部键对介导。结果，SNMO的磁性行为包括共存的FM-AFM相，它们分别受反现场有序结构和无序结构的控制。 M（t）中的趋势趋势和M（h）测量中的两个步骤可逆环行为表明在广泛的温度值（t $ _ {d} <$ t $ <$ t $ _ {c} $）上存在竞争的FM-AFM阶段。
The structural, electronic and magnetic properties of anti-site disordered Sm$ _{2} $NiMnO$ _{6} $ double perovskite has been studied. RE$_{2}$NiMnO$_{6}$ (RE: rare-earth) ordered double perovskite is commonly believed to show two distinct magnetic phase transitions viz, paramagnetic to ferromagnetic (FM) transition at T = T$ _{C} $ due to Ni-O-Mn super exchange interaction and another transition at T = T$ _{d} $ due to coupling of RE spins with Ni-Mn network. In our present study, we have observed that the presence of intrinsic B-site disorder results in an additional antiferromagnetic (AFM) coupling, mediated via Ni-O-Ni and Mn-O-Mn local bond pairs. As a consequence, the magnetic behavior of SNMO comprises of co-existing FM-AFM phases, which are respectively governed by the anti-site ordered and disordered structures. Field dependent inverted cusp like trend in M(T) and two step reversible loop behavior in M(H) measurements indicate the presence of competing FM-AFM phases over a wide range of temperature values (T$ _{d} < $ T $ < $ T$ _{C} $).
