C-axis modulated structure

Fig. 11. Orthorhombic distortion of tetragonal HoNi2B2C (a) upon cooling from 15 K to 1.5 K the neutron diffraction reflection (332) splits into two peaks, (b) Schematic presentation of the distortion a,b — original tetragonal axes dashed line tetragonal basal plane —f shift of the Ho atoms leading to the orthorhombic cell with the axes onh- Thick arrows Ho magnetic moments in the commensurate c-axis modulated structure...

$Fig. 11. Orthorhombic distortion of tetragonal HoNi2B2C (a) upon cooling from 15 K to 1.5 K the neutron diffraction reflection (332) splits into two peaks, (b) Schematic presentation of the distortion a,b — original tetragonal axes dashed line tetragonal basal plane —f shift of the Ho atoms leading to the orthorhombic cell with the axes <ionh> onh- Thick arrows Ho magnetic moments in the commensurate c-axis modulated structure...$

Er 9 32 80 c-Axis ferrimagnetic cone structure c-Axis modulated structure... [Pg.2064]

Magnetostrictive effects in Er are clearly visible in the temperature variation of the lattice parameters determined in the neutron diffraction study of Haben-schuss et al. (1974). The appearance of the c-axis modulated structure below Tv = 84.4 K has little effect on the lattice constants (fig. 6.35), but below the basal plane ordering temperature Ts 52.4 K, the c-axis expands in the manner of the exchange magnetostriction found in the spiral phases of Tb and Dy. Ferromagnetic alignment of the c-axis moment at Tc = 18 K is marked by a... [Pg.466]

Fig. 2. Schematic description of the spin structures in the heavy rare earth metals. The initial high-T ordering, in all except the ferromagnet Gd, is to an incommensurate periodic spin order with propagation direction along the c-axis. CAM (c-axis modulation) is a structure in which the c-axis components of the moment are sinusoidally modulated which evolves into the APD (quasi anti-phase domain) in Er in which a gradual squaring-up of the c-axis moment occurs with additional order appearing in the basal plane. The temperatures of the transitions are from magnetization and neutron diffraction data. (After Legvold 1980.)...

$Fig. 2. Schematic description of the spin structures in the heavy rare earth metals. The initial high-T ordering, in all except the ferromagnet Gd, is to an incommensurate periodic spin order with propagation direction along the c-axis. CAM (c-axis modulation) is a structure in which the c-axis components of the moment are sinusoidally modulated which evolves into the APD (quasi anti-phase domain) in Er in which a gradual squaring-up of the c-axis moment occurs with additional order appearing in the basal plane. The temperatures of the transitions are from magnetization and neutron diffraction data. (After Legvold 1980.)...$

Erbium exhibits a complex magnetic behaviour, with at least four obserrable characteristic temperatures below rN = 85K, the moments order in a sinusoidal c-axis modulated (CAM) structure at rH=54K, there appears a component perpendicular to the c-axis resulting in a helicoidal structure this intermediate phase exhibits a sequence of lock-in transitions of commensurate phases (spin-slip structures) with wave vectors fm = f, 4 observed by iX-ray scattering (Gibbs et al. 1986), the... [Pg.268]

Figure 8.10 Idealized structures of Bi2Ca2Sr2Cu3O10+s (a) atomic structure projected down [100] (b) structure as Bi-O and perovskite lamellae (c) incommensurate modulation (exaggerated) along the b axis with a period b 5.8 b (orthorhombic) and (d) incommensurate modulation (exaggerated) along the b axis with a period b w 5.8 h (monochnic).

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