Spin-charge-coupled transverse resistance in an ambipolar conductor YH2-based Hall-bar structure with perpendicularly magnetized current-injection electrodes

Kaname Sato, Yutaro Takahashi, Shujiro Akisato, Ryota Mikami, Nao Suganuma, Yugo Ashizawa, Hayate Kawaguchi, Yoshikata Nakajima, Tomofumi Ukai, Yasuhiko Fuji, Tatsuro Hanajiri, Junya Kaneko, Osamu Nakamura, Pham Van Thach, Hiroyuki Awano, Shigehiko Hasegawa and Masamichi Sakai

This study addressed Hall effect measurements in the nonstoichiometric α-phase ytterbium dihydride (α-YbH2±δ) and β-phase ytterbium trihydride (β-YbH3−δ) films. We have prepared orthorhombic α-YbH2.05 and cubic β-YbH2.7 polycrystalline films using hydrogenation of precursor Yb films formed in a molecular-beam process. The observed positive Hall coefficients indicate p-type conduction in α-YbH2.05 and β-YbH2.7. Experimental results in the orthorhombic α-phase suggest a conduction-type change depending on compositions around the stoichiometric composition of YbH2. Possible conduction mechanisms in these nonstoichiometric ytterbium hydrides are discussed from the viewpoint of modulation of electronic structures by hydrogen vacancies.

Physica Scripta 

98

4

10.1088/1402-4896/acc4f2