3 research outputs found
Significant suppression of weak ferromagnetism in (LaEu)CuO
The magnetic structure of (LaEu)CuO has been
studied by magnetization measurements of single crystals, which show
antiferromagnetic long-range order below = 265 K and a structural phase
transition at = 130 K. At , the Cu spin susceptibility
exhibits almost the same behavior as that of LaCuO in the
low-temperature orthorhombic phase, which indicates the existence of finite
spin canting out of the CuO plane. At , the magnitude of the
weak-ferromagnetic moment induced by the spin canting is suppressed
approximately by 70{%}. This significant suppression of the weak-ferromagnetic
moment is carefully compared with the theoretical analysis of weak
ferromagnetism by Stein {\it et al.} (Phys. Rev. B {\bf 53}, 775 (1996)), in
which the magnitude of weak-ferromagnetic moments strongly depend on the
crystallographic symmetry. Based on such comparison, below
(LaEu)CuO is in the low-temperature less-orthorhombic
phase with a space group of . We also discuss the possible magnetic
structure of the pure low-temperature tetragonal phase with space group
, which is relevant for rare-earth and alkaline-earth ions co-doped
LaCuO.Comment: 16 pages including 5 figures, submitted to Phys. Rev. B. Fig. 4 is
newly adde
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