Physical properties of semimetallic magnets UOX (X = S, Se, Te)

Opletal, P.  ; 酒井 宏典   ; 芳賀 芳範   ; 三宅 厚志*; 徳永 将史*; 常盤 欣文  ; 山本 悦嗣  ; 神戸 振作  ; 徳永 陽  

Opletal, P.; Sakai, Hironori; Haga, Yoshinori; Miyake, Atsushi*; Tokunaga, Masashi*; Tokiwa, Yoshifumi; Yamamoto, Etsuji; Kambe, Shinsaku; Tokunaga, Yo

UOX (X = S, Se, Te) crystallizes in tetragonal PbFCl-type structure (P4/nmm space group). Only polycrystalline samples are reported in literature. UOS, UOSe and UOTe were reported to be antiferromagnets with T = 55, 100 and 160 K, respectively. Magnetic structure of UOS and UOSe were reported to have moment along the c-axis with Q = (0,0,1/2). UOS and UOSe were both reported to exhibit semiconducting behavior on polycrystalline samples. UOTe was theoretically predicted to have nontrivial topology. We have prepared first single crystals of UOX (X = S, Se, Te) and shown they exhibit semimetallic conductivity and UOS exhibits increase of T by almost 30 K in contrast to published literature. We will present the method of preparation of single crystals, results of magnetic, transport, thermal measurements, all effect and data obtained in high magnetic fields. We will discuss these results in connection to Weyl semimetals and results published in literature and anisotrpy observed in electric resistivity.