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- Title
Magnetism and Transport Properties of EuCdBi 2 with Bi Square Net.
- Authors
Liu, Yi; Li, Jing; Song, Shi-Jie; Yang, Wu-Zhang; Bao, Jin-Ke; Jiao, Wen-He; Xu, Xiao-Feng; Ren, Zhi; Cao, Guang-Han
- Abstract
We report a possible coexistence of nontrivial topology and antiferromagnetism in the newly discovered compounds EuCdBi 2 , with magnetic Eu layer locating above and below Bi square net. The X-ray diffraction on single crystals and powder indicats that this 112-type material crystalizes in space group of I 4 / m m m , the same as SrMnBi 2 and EuMnBi 2 . Our combined measurements of magnetization, electrical transport and specific heat consistently reveal antiferromagnetic (AFM) transition of Eu 2 + moments at T N = 20 K. The Eu moments are not saturated under a field of 7 T at 1.8 K. The anisotropic susceptibility suggests the Eu moments lie in the a b plane, and a metamagnetic (MM) transition is observed near 1 T below T N . Large positive magnetoresistance (MR) present for both H ‖ a b and H ‖ c , which are considered to contain part contributions from Dirac bands. Hall measurements show the electron-hole compensation effect is prominent above 100 K, with a crossover of Hall resistance from negative to positive values at ∼150 K. The fitted mobility of electrons is as high as 3250 cm 2 V − 1 S − 1 at 1.8 K. Interestingly, the rapid increase of carrier density and suppression of mobility appear at around T N , indicating non-negligible interaction between Eu moments and electron/hole bands. EuCdBi 2 may provide a new platform to investigate the interplay of topological bands and antiferromagnetic order.
- Subjects
CARRIER density; MAGNETISM; ELECTRON mobility; SPECIFIC heat; SQUARE; MAGNETIZATION measurement
- Publication
Crystals (2073-4352), 2023, Vol 13, Issue 4, p654
- ISSN
2073-4352
- Publication type
Article
- DOI
10.3390/cryst13040654