[18p-Z15-1~15] 6.4 Thin films and New materials

△ [18p-Z15-6] Fabrication of new compound EuCdSb₂ by molecular beam epitaxy

〇(M2)Mizuki Ohno¹, Masaki Uchida^1,2,3, Yusuke Nakazawa¹, Shin Sato¹, Markus Kriener⁴, Atsushi Miyake⁵, Masashi Tokunaga^4,5, Yasujiro Taguchi⁴, Masashi Kawasaki^1,4 (1.Dept. of Appl. Phys., The Univ. of Tokyo, 2.Dept. of Phys., Tokyo Tech, 3.JST-PRESTO, 4.RIKEN CEMS, 5.ISSP, The Univ. of Tokyo)

Keywords:MBE, magnetotransport, Layered materials

Ternary layered pnictides ABSb₂ (A : rare or alkaline earths, B : transition metals) host anisotropic Dirac cones based on Sb square nets, and interesting magnetotransport emerges especially by interaction to magnetism of A and/or B ions. Actually, nearly half of the ABSb₂ materials has not been synthesized yet for all the combinations of A=Ca, Yb, Eu, Sr, and Ba and B=Mn, Zn, Cd, because it becomes difficult to stabilize ABSb₂ with smaller A site and larger B site ionic radius. Here, we report fabrication of EuCdSb₂ with the largest B site ionic radius, which is first stabilized in the thin film form by molecular-beam epitaxy. EuCdSb₂ crystallizes in an orthorhombic Pnma structure with distorted Sb square nets. This material exhibits antiferromagnetic ordering of Eu magnetic moments and unique semiconducting transport.