Magnetic complexity in RScT (R=Gd, Pr, T=Sb, Ge) based compound
ORAL
Abstract
Ternary RTX intermetallics, where R = rare earth, T = transition metal, X = p-block element, are structurally and magnetically diverse and are among the most interesting intermetallic compounds to explore (Gupta et. al. JALCOM 618 (2015) 562). For example, GdScGe crystallizes in tetragonal CeScSi-type structure and undergoes paramagnetic to ferromagnetic (FM) transition at TC = 350K, while PrScGe (same CeScSi-structure type) has an antiferromagnetic (AFM) transition at TN = 140K followed by a second AFM transition at TN = 88K and then FM transition at TC = 80K. When germanium is replaced by antimony, the GdScSb compound crystallizes in a closely related tetragonal CeFeSi-type and orders AFM at TN ~55K. Here we present a systematic study of the interplay between crystal structure and magnetism in Gd1-xPrxScGe and GdSc(Ge1-xSbx). The substitution of heavy lanthanide, Gd, with light lanthanide, Pr, results in a complex magnetic ground state with a large exchange bias of HE ~ 1.06 kOe at T = 2K.
*The Ames Laboratory is operated for the U. S. DOE by Iowa State University of Science and Technology under contract No. DE-AC02-07CH11358. This work was supported by the Department of Energy, Office of Basic Energy Sciences, Materials Sciences and Engineering Division.
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Presenters
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Arjun Pathak
- Materials sciences and engineering, Ames Laboratory, US DOE, Ames IA