Electronic, magnetic, and superconducting properties of compounds and thin films

本项目的目标是研究陶瓷氧化物和金属插层化合物的块状和薄膜的电子、磁性和超导性。我的研究重点将是过渡金属氧化物（钙钛矿结构），这些氧化物显示出丰富而非凡的物理特性，这些特性在技术上非常重要，例如高TC超导体和锰氧化物。在某些钙钛矿中，电子的轨道自由度与它们的自旋和轨道之间的强耦合一起影响它们的磁性和导电性质。例如，钙钛矿，LaVO 3在低温下经历结构和反铁磁相变，在新相中具有不同的轨道和自旋有序。另一个有趣的化合物是PrCoO 3（可能用于电化学器件），它是一种没有磁性转变的绝缘体。然而，用Sr或Ca对La的轻微替换（掺杂）导致该材料在小磁场下显示出大的磁致伸缩性（MR）。我建议做以下的研究如何应变以及外部压力影响的电子和磁性的块状和薄膜的LaVO 3以及Pr（1-x）SrxCoO 3。这将使我们能够研究并看看我们是否可以将这些材料的薄膜用于可能的应用。

The objective of this proposal is to study electronic, magnetic and superconductivity of bulk and thin films of ceramic oxides and metal intercalated compounds. The main focus of my research will be on transition metal oxides (perovskite structure) which have shown rich and extraordinary physical properties that are technologically important, such as high TC superconductors and manganites. In some perovskite, the orbital degrees of freedom of electrons in conjunction with the strong coupling between their spin and orbit affect their magnetic and conducting properties. For example, perovskite, LaVO3 undergoes a structural and anti-ferromagnetic phase transition at low temperature with different orbital and spin ordering in the new phase. Another interesting compound is PrCoO3 (possible uses in electrochemica devices) which is an insulator with no magnetic transition. However, slight replacement (doping) of La with Sr or Ca causes this material to show large magneto-resististance (MR) with a small magnetic field. I am proposing to do the following research on how strain as well as external pressures affect the electronic and magnetic properties of the bulk and films of LaVO3 as well as Pr(1-x)SrxCoO3. This will allow us to investigate and to see whether or not we can use the thin films of these materials for possible application.