Abstract
Magnetic order of HoB 4 with Shastry–Sutherland-type Ho lattice has been studied by neutron diffraction. In HoB 4 , two magnetic phase transitions take place at T N 1 = 7.1 K and T N 2 = 5.7 K . Below T N 1 , the intensity of the magnetic satellite reflection described by Q = ( ± δ ± δ ± δ ′ ) with δ = 0.022 and δ ′ = 0.424 gradually increases together with the weak intensity of the ( 1 0 0 ) magnetic reflection. Below T N 2 , the intensity of the ( 1 0 0 ) reflection steeply increases like a first-order transition and the satellite reflection disappears. These magnetic phase transitions are similar to those of HoB 2 C 2 in which the rare-earth ions form a square lattice without geometrical frustration.
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