http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Young-HyunChoi,Sang-HwanKim,Young-UkKwon,Chang-HeeLee,Jung-SooLee,Hae-SubShim 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.IV
Temperature-dependent neutron diffraction studies were performed on the ferromagnetic layered manganites La$_{2-2x}$Sr$_{1+2x}$Mn$_2$O$_7$ ($x$ = 0.35 and 0.4), and the detailed temperature variations of the crystal and the magnetic structures are reported. The ferromagnetic Mn-spins had temperature-dependent orientations. The spins were tilted towards the $c$-axis of the tetragonal unit cell, perpendicular to the perovskite layer at the onset of the ferromagnetic state and as the temperature was lowered gradually rotated to the ab-plane to tilting angles ($\theta$) against the $c$-axis of 62(1)$^\circ$ and 65(2)$^\circ$ for the $x$ = 0.35 and 0.4 compounds, respectively. A simple model based on crystal field theory is proposed to explain the variation of the tilting angle with the composition and the temperature of the compounds with 0.30$<x<$0.4.