Competition of multi-degrees of freedom and multicriticality in strongly correlated electron systems.

我们发现了两个不同有序态相互竞争的新系统，它们产生了一个多临界点：Ba^<1-x>Sr^xV^<13>O ^1和La ^5M ^<o4>O^<16>，我们还发现了这些系统中由多临界性产生的特征物理性质。此外，我们还通过外加磁场下的热导率测量，阐明了MnV^2O^4中自旋和轨道涨落的临界增强。我们还通过电子衍射测量，包括洛伦兹电子显微镜技术，阐明了钙钛矿锰氧化物中的电子相分离。

We discovered new systems in which two different ordered states are competing and those produce a multicritical point : Ba^<1-x> Sr^xV^<13> O^1 and La^5M^<o4> O^<16>, and we found characteristic physical properties produced by the multicriticality in these systems. Furthermore, we clarified the critical enhancement of both spin and orbital fluctuation in MnV^2O^4 by means of thermal conductivity measurement with applied magnetic field. We also clarified the electronic phase separation in perovskite manganites by means of electron diffraction measurement including the Lorentz electron microscope technique.