Development of method for simultaneous determination of thermal transport properties and research for the electronic properties of Eu compounds

我们发展了一种在压力下同时测定四种输运性质的方法：定性导热系数和比热，以及电阻率和热电势。对于Eu化合物，我们生长了单晶，研究了它们的电学性质，并通过测量De Haas van Alphen效应和压力效应来寻找压力诱导相变。我们澄清了高于6 Gpa的压力诱导价态转变，并观察到在EuGa4的压力下可能出现了CDW。对于特殊的二次棱镜型费米面和驱动EuGa4中的CDW，可以实现嵌套效应。我们测量了EuNi2P2的热膨胀、磁化率、比热和热势，并形成了重费米子态。

We developed a principled method for simultaneous determination under pressure of four values of transport properties: qualitative thermal conductivity and specific heat in addtion to electrical resistivity and thermopower.For Eu compounds, we grew single crystals and studied their electronic properties and searching for pressure-induced phase transition by measuring the de Haas van Alphen effect and pressure effect. We clarified pressure-induced valence transition above 6 GPa and observed a plausible emergence of the CDW under pressures for EuGa4. The nesting effect might be realized for peculiar quadratic prism-like Fermi surface and drive CDW in EuGa4. We reported that measured the thermal expansion, magnetic susceptibility, specific heat, and thermopower, and formed heavy fermion state in EuNi2P2.