Hydrogen induced structural and magnetic transformations in the hexagonal Laves phase ErMn2

Specific heat anomalies in RMn2(H,D) hydrides

“…Unlike the case of TbMn 2 hydrides/deuterides (cubic C15 structure), the hexagonal C14 structure may be the important factor at ErMn 2 hydrides/deuterides. A certain difference can be also seen in the fact that the X-ray diffraction on ErMn 2 H 2 has revealed a clear distortion for the singlephase hydride accompanying the onset of magnetic order, not visible for the cubic hydrides [6].…”

“…in the hexagonal ones. The hydrogen/deuterium absorption in RMn 2 (H,D) x leads to a modification of the crystal structure and strongly influences magnetic properties [5,6].…”

Current progress in the magnetism of rare-earth–hydrogen systems

“…Thus, the interplay of magnetism with H superstructures was demonstrated through the appearance of SRO AFM lines in frustrated Laves hydrides Tb(Mn 1−y Al y ) 2 H x as a function of x by Goncharenko et al [15], while Figiel et al [16] observed the appearance of noncollinear canted ferrimagnetism in hexagonal ErMn 2 H x after an H-induced structural transformation at 220-250 K for x = 3.5-4.5.…”

Synchrotron X-ray diffraction study of ErMn2D2

“…At room temperature the hexagonal C14 Laves phase-related structure, space group (s.g.) P6 3 /mmc, was found, while the pattern obtained below ∼210 K was attributed to a triclinic distortion to s.g. P1 [1]. Because of rather low quality of the data, attempts to refine them with structures of higher symmetry did not give satisfactory results.…”

“…The ErMn 2 H 2 (ErMn 2 D 2 ) hydride has earlier been studied using standard X-ray diffraction technique [1,2]. At room temperature the hexagonal C14 Laves phase-related structure, space group (s.g.) P6 3 /mmc, was found, while the pattern obtained below ∼210 K was attributed to a triclinic distortion to s.g. P1 [1].…”