Magnetic Phase Diagram of Geometrically Frustrated Magnetic System ErB₄ under High Pressure

Abstract

Rare-earth tetraborides (REB 4) crystallize in tetragonal crystal structure, where the sublattice of rare-earth ions forms in ab-plane a geometrically frustrated Shastry-Sutherland lattice. In this work we constructed a detailed T N vs. B phase diagram of ErB 4 from data of temperature/field dependencies of resistance. We have applied hydrostatic pressure up to 2.88 GPa using a piston cylinder pressure cell and performed sensitive ac-resistance measurements in temperature range 1.8 K-300 K and in magnetic fields up to 6 T. The obtained results exhibit shifts of ordering temperature T N to higher values as well as shifts of boundaries between different magnetic phases. The effect of pressure on the interaction between magnetic ions in this compound is discussed and compared with the previous results obtained on TmB 4 .

Phase Diagram Mapping out the Complex Magnetic Structure of Single Crystals of (Gd, Er)B4 Solid Solutions

“…A very well-known geometrical frustrated system is the Shastry-Sutherland lattice, which can be realized in a group of layered compounds [3]. The Shastry-Sutherland model has also been realized in systems displaying magnetization plateaus in the presence of a magnetic field [3][4][5].…”