论文标题
晶格对半掺杂的钙钛矿的物理特性的影响
Lattice effects on the physical properties of half doped perovskite ruthenates
论文作者
论文摘要
我们研究了Srruo $ _ {3} $和SR $ _ {0.5} $ CA $ _ {0.5} $ ru $ _ {1-x} $ cr $ _ {x} $ $ $ $ $ $ $ _ {3} $（x = 0,0.05和0.1）使用x-ray diffraction，x-ray diffraction，调查了srruo $ _ {3} $和sr $ _ {0.5} $ _ {0.5} $ _ {0.5} $ ca $ _ {0.5} $ _ {0.5} $ _ {0.5} $ x-ray diffraction，光谱法。我们的结果表明，化合物从$流动的$ ferromagnetism到$本地化的$ ferromagnetism进行了跨界。合并的研究表明RU和CR处于4+价状态。 Cr掺杂观察到了Griffith阶段和Curie温度（TC）从38 K到107 K的增强。通过Cr掺杂，观察到化学势向价带的转移。在金属样品中，有趣的是，观察到电阻率和正骨应变之间的直接联系。朝这个方向的详细研究将有助于了解相互作用的性质，从而操纵其特性。在非金属样品中，电阻率主要受障碍和电子电子相关效应的控制。 5％Cr掺杂样品的电阻率值表明半金属行为。使用电子光谱技术详细了解其性质，可以揭示其在室温下高移动晶体管中实用性的可能性，其与铁磁剂的合并性能将有助于制造自旋装置。
We investigate the unusual phase transitions in SrRuO$_{3}$ and Sr$_{0.5}$Ca$_{0.5}$Ru$_{1-x}$Cr$_{x}$O$_{3}$ (x=0,0.05 and 0.1) employing x-ray diffraction, resistivity, magnetic studies and x-ray photoemission spectroscopy. Our results show the compounds undergo crossover from $itinerant$ ferromagnetism to $localised$ ferromagnetism. The combined studies suggests Ru and Cr to be in 4+ valence state. A Griffith phase and an enhancement in Curie temperature (Tc) from 38 K to 107 K is observed with Cr doping. A shift in the chemical potential towards the valence band is observed with Cr doping. In the metallic samples, interestingly, a direct link between the resistivity and orthorhombic strain is observed. Detailed studies in this direction will be helpful to understand the nature of interactions and hence manoeuvre its properties. In the non metallic samples, the resistivity is mainly governed by disorder and electron-electron correlation effects. The value of the resistivity for the 5% Cr doped sample suggests semi metallic behaviour. Understanding its nature in detail using electron spectroscopic techniques could unravel the possibility of its utility in high mobility transistors at room temperature and its combined property with ferromagnetism will be helpful in making spintronic devices.
