Spin polarization measurements in ferromagnetic SrRuO3 using point-contact Andreev reflection technique

International Conference on Strongly Correlated Electron Systems 2016

Shiga, Masanobu^1 ; Nishimura, Naoto^1 ; Inagaki, Yuji^1 ; Kawae, Tatsuya^1 ; Kambara, Hiroshi^2 ; Tenya, Kenichi^2

Department of Applied Quantum Physics, Faculty of Engineering, Kyushu University, Motooka, Fukuoka

812-8581, Japan^1

Faculty of Education, Shinshu University, Nagano

380-8544, Japan^2

关键词: Contact areas;    Diffusive transport;    Point contact Andreev reflection;    Polycrystalline;    Single-crystal films;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/807/8/082001/pdf
DOI  :  10.1088/1742-6596/807/8/082001

来源: IOP

【 摘 要 】

Using the point-contact Andreev reflection (PCAR) technique, we have performed spin polarization measurements in a polycrystalline SrRuO3to study the difference of the spin polarization between the ballistic and diffusive transport samples. PCAR spectra were measured with Nb tips for T = 4.2 K with changing the contact area mechanically. The results were well fitted by the modified Blonder-Tinkham-Klapwijk (mBTK) model. We estimate the spin polarization P ≈ 0.59, which is slightly larger than that of a single crystal film with P ≈ 0.51 due to the change of transport property.