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All sourcesNASA NTRSDOE OSTI
DOE OSTI2021

Unconventional magnetic order emerging from competing energy scales in the new R Rh 3 Si 7 intermetallics ( R = Gd-Yb)

The competition between Ruderman-Kittel-Kasuya-Yosida (RKKY), crystal electric field (CEF), and Kondo energy scales has recently emerged at the heart of complex magnetism in several Ce- or Yb-based intermetallics. Hard axis magnetic order has been observed in a handful of these compounds, independent of the crystal symmetry, size of the ordered moment, or the relative scale of the Kondo and magnetic ordering temperatures. This raises the question of the role of each energy scale in driving the ground state properties. In focusing on a single class of compounds, the rhombohedral RRh 3 Si 7 , we compare the anisotropy and magnetic ground states in members of this series with only RKKY interactions (R = Gd), or RKKY and CEF effects (R = Tb-Tm), with the behavior of the R = Yb compound, where all three energy scales (RKKY, CEF, Kondo) are at play. Moreover, we extend the comparison to two other isostructural Kondo systems YbIr 3 Si 7 and YbIr 3 Ge 7 , where hard axis magnetic order is also observed. The non-Kondo compounds RRh 3 Si 7 (R = Tb-Tm) lack the complexity of magnetic order along the hard CEF axis, pointing to the dominant role of the Kondo effect in driving this magnetic order. Furthermore, the CEF-RKKY competition is still responsible for complex magnetic ground states, and it appears that the electronic and magnetic degrees of freedom are entangled in all magnetic members of this series of compounds.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Tb3Tm by Materials Project

TmTb3 is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Tm is bonded to twelve Tb atoms to form TmTb12 cuboctahedra that share corners with four equivalent TmTb12 cuboctahedra, corners with eight equivalent TbTb8Tm4 cuboctahedra, edges with eight equivalent TmTb12 cuboctahedra, edges with sixteen equivalent TbTb8Tm4 cuboctahedra, faces with four equivalent TmTb12 cuboctahedra, and faces with fourteen TbTb8Tm4 cuboctahedra. There are four shorter (3.54 Å) and eight longer (3.55 Å) Tm–Tb bond lengths. There are two inequivalent Tb sites. In the first Tb site, Tb is bonded to four equivalent Tm and eight Tb atoms to form TbTb8Tm4 cuboctahedra that share corners with twelve equivalent TbTb8Tm4 cuboctahedra, edges with eight equivalent TmTb12 cuboctahedra, edges with sixteen TbTb8Tm4 cuboctahedra, faces with four equivalent TmTb12 cuboctahedra, and faces with fourteen TbTb8Tm4 cuboctahedra. There are four shorter (3.54 Å) and four longer (3.55 Å) Tb–Tb bond lengths. In the second Tb site, Tb is bonded to four equivalent Tm and eight equivalent Tb atoms to form TbTb8Tm4 cuboctahedra that share corners with four equivalent TbTb8Tm4 cuboctahedra, corners with eight equivalent TmTb12 cuboctahedra, edges with twenty-four TbTb8Tm4 cuboctahedra, faces with six equivalent TmTb12 cuboctahedra, and faces with twelve TbTb8Tm4 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Tb3Tm by Materials Project

TmTb3 is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Tm is bonded to twelve equivalent Tb atoms to form TmTb12 cuboctahedra that share corners with twelve equivalent TmTb12 cuboctahedra, edges with twenty-four equivalent TbTb8Tm4 cuboctahedra, faces with six equivalent TmTb12 cuboctahedra, and faces with twelve equivalent TbTb8Tm4 cuboctahedra. All Tm–Tb bond lengths are 3.54 Å. Tb is bonded to four equivalent Tm and eight equivalent Tb atoms to form TbTb8Tm4 cuboctahedra that share corners with twelve equivalent TbTb8Tm4 cuboctahedra, edges with eight equivalent TmTb12 cuboctahedra, edges with sixteen equivalent TbTb8Tm4 cuboctahedra, faces with four equivalent TmTb12 cuboctahedra, and faces with fourteen equivalent TbTb8Tm4 cuboctahedra. All Tb–Tb bond lengths are 3.54 Å.

36 MATERIALS SCIENCE↗