[15p-A409-1~11] 6.3 Oxide electronics

△ [15p-A409-8] Anomalous Hall effect at a pyrochlore interface of magnetic insulator/nonmagnetic metal

〇Yoshisuke Ohnishi¹, Takahiro Fujita¹, Masashi Kawasaki^1,2 (1.The Univ. of Tokyo, 2.RIKEN CEMS)

Keywords:hetero, anomalous Hall, pyrochlore

Non-coplanar spin configurations have attracted attention as a platform to generate the topological Hall effect because they produce an effective magnetic field due to Berry phase mechanism. Pyrochlore oxide Dy₂Ti₂O₇ is known to be a prototypical classical “spin-ice” compound that exhibits a non-coplanar spin configuration. Additionally, a metamagnetic transition has been reported below 2 K by applying a magnetic field along [111] direction. In this study, we attempt to observe magnetotransport properties reflecting the non-coplanar spin structure and its transition in Dy₂Ti₂O₇. Because Dy₂Ti₂O₇ is electrically insulating, we prepare a hetero-interface structure of Dy₂Ti₂O₇ and a paramagnetic metal Pb₂Ru₂O_6.5, wherein the effective magnetic field of Dy₂Ti₂O₇ layer can induce emergent magnetotransport properties in Pb₂Ru₂O_6.5 layer. We observe conventional and unconventional anomalous Hall effect seemingly relates with the magnetic transition of Dy₂Ti₂O₇, both of which are absent in Pb₂Ru₂O_6.5 alone and thus plausibly from the non-coplanar spin structure of Dy₂Ti₂O₇.