Crystal and magnetic structure of the La$_{1-x}$Ca$_{x}$MnO$_{3}$ compound $(x=0.8,0.85)$

M. Pissas; G. Kallias; M. Hofmann; D. M. Többens

doi:10.1103/PhysRevB.65.064413

paper

Crystal and magnetic structure of the La $_{1 - x}$ Ca $_{x}$ MnO $_{3}$ compound $(x = 0.8, 0.85)$

arXiv:cond-mat/0111352 · doi:10.1103/PhysRevB.65.064413

Abstract

We studied the crystal and magnetic structure of the La $_{1 - x}$ Ca $_{x}$ MnO $_{3}$ compound for $x = 0.8$ and $x = 0.85$ . At T=300 K both samples are paramagnetic with crystallographic symmetry $P nma$ . At low temperatures they undergo a monoclinic distortion from orthorhombic $P nma$ -type structure with $a_{p} 2 \times 2 a_{p} \times a_{p} 2$ to a monoclinic structure with ( $a_{p} 2 \times 2 a_{p} \times a_{p} 2$ , $β = 90 + ε \sim 91. 4^{o}$ ) and $P 2_{1} / m$ space group below $T_{N}$ . The onset of the structural transformation coincides with the development of the $C$ -type long range antiferromagnetic order with propagation vector $k = (1/2, 0, 1/2)$ . The monoclinic unit cell allowed us to determine the direction of the Mn magnetic moment with respect to the crystallographic axes: it is perpendicular to the propagation vector, $m ⊥ k = (1/2, 0, 1/2)$ . The amplitude of the ordered magnetic moment at $T = 1.6$ K is found to be $2.53 (2)$ and $2.47 (2) μ_{B}$ for $x = 0.8$ and 0.85, respectively.

In press (Phys. Rev B 01 Feb 2002)

Crystal and magnetic structure of the La1−x​Cax​MnO3​ compound (x=0.8,0.85)

Abstract

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Crystal and magnetic structure of the La $_{1 - x}$ Ca $_{x}$ MnO $_{3}$ compound $(x = 0.8, 0.85)$