Significant suppression of weak ferromagnetism in (La${}_{1.8}$Eu${}_{0.2}$)CuO${}_4$

I. Tsukada; X. F. Sun; Seiki Komiya; A. N. Lavrov; Yoichi Ando

doi:10.1103/PhysRevB.67.224401

paper

Significant suppression of weak ferromagnetism in (La $_{1.8}$ Eu $_{0.2}$ )CuO $_{4}$

arXiv:cond-mat/0212360 · doi:10.1103/PhysRevB.67.224401

Abstract

The magnetic structure of (La $_{1.8}$ Eu $_{0.2}$ )CuO $_{4}$ has been studied by magnetization measurements of single crystals, which show antiferromagnetic long-range order below $T_{N}$ = 265 K and a structural phase transition at $T_{s}$ = 130 K. At $T_{s} < T < T_{N}$ , the Cu spin susceptibility exhibits almost the same behavior as that of La $_{2}$ CuO $_{4}$ in the low-temperature orthorhombic phase, which indicates the existence of finite spin canting out of the CuO $_{2}$ plane. At $T < T_{s}$ , 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 $T_{s}$ (La $_{1.8}$ Eu $_{0.2}$ )CuO $_{4}$ is in the low-temperature less-orthorhombic phase with a space group of $P cc n$ . We also discuss the possible magnetic structure of the pure low-temperature tetragonal phase with space group $P 4_{2} / n c m$ , which is relevant for rare-earth and alkaline-earth ions co-doped La $_{2}$ CuO $_{4}$ .

16 pages including 5 figures, submitted to Phys. Rev. B. Fig. 4 is newly added

Significant suppression of weak ferromagnetism in (La $_{1.8}$ Eu $_{0.2}$ )CuO $_{4}$

Abstract

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Significant suppression of weak ferromagnetism in (La1.8​Eu0.2​)CuO4​

Abstract

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Cited by in corpus (7)

Significant suppression of weak ferromagnetism in (La $_{1.8}$ Eu $_{0.2}$ )CuO $_{4}$