Reentrant behavior of the charge and orbital ordering and antiferromagnetism inLaSr2Mn2O

Soft X-Ray Resonant Magnetic Diffraction

“…Here the same sample was mounted on a four-circle diffractometer with an incident photon energy of 94.8 keV. As found by others [15], the charge ordering reaches a maximum at 180 K before reducing in intensity and disappearing below 120 K. In Fig. 4, we can see that the onset of the AFM ordering at 180 K exactly coincides with the maximum intensity of the charge ordering.…”

“…The right side of Fig. 1 shows the magnetic structure which is ferromagnetic in the a-b plane but antiferromagnetic along the c axis previously solved by neutron scattering techniques [15]. Therefore below 180 K a magnetic diffraction peak due to the AFM structure should occur at the (001) position, even though the (001) Bragg reflection is systematically absent because of the crystal symmetry.…”

Charge ordering and structural distortions at low temperature inLa2−2xSr1+2xWilkins1, Spencer2, Beale3 et al. 2003Phys. Rev. B285140View full textAdd to dashboardCite

“…The true orbital order supercell is smaller than that shown in Fig. 2 11,12 and x-ray-diffraction studies 13 have shown the presence of a charge and orbitally ordered state at low temperatures. In the electron-diffraction measurements by Li et al 11 and Kimura et al, 12 the appearance of charge order reflections at ͑0.25, 0.25, 0͒ around the Bragg peaks below 220 K was reported, and that they maximize in intensity at approximately 180 K before disappearing at 100 K. In addition, x-ray-diffraction studies have been performed using resonant x-ray scattering and high-energy x-ray scattering.…”

“…In the electron-diffraction measurements by Li et al 11 and Kimura et al, 12 the appearance of charge order reflections at ͑0.25, 0.25, 0͒ around the Bragg peaks below 220 K was reported, and that they maximize in intensity at approximately 180 K before disappearing at 100 K. In addition, x-ray-diffraction studies have been performed using resonant x-ray scattering and high-energy x-ray scattering. 13,14 Among the x-ray and electron-diffraction measurements, there has been some disagreement in the position of the charge, Jahn-Teller, and orbital order satellites in the literature. The electron diffraction measurements by Kimura et al 12 and the high-energy measurements of Chatterji et al reported that the charge order satellites occurring at a modulation of ͑0.25, 0.25, 0͒ around the Bragg peaks.…”

“…The xϭ0.475 sample is of interest because it is very close to the 0.47 boundary below which the charge ordered state is not observed and has not been reported on by the previous x-ray measurements. 13,14 By observing the behavior of the charge ordered state in the xϭ0.475 sample and comparing the results with those from the xϭ0.5 sample, it is hoped to understand the charge ordered region of the phase diagram as shown in Fig. 3.…”