High energy X-ray diffraction measurements on Gd0.5Sr0.5MnO3

We report on high-energy (100 keV) x-ray diffraction measurements in high magnetic fields on Gd0.5Sr0.5MnO3. This system is reported to have a charge ordered state below 90 K and a spin glass behaviour below 42 K. The experiment was performed at the high energy x-ray diffraction beamline BW5 at DORIS. A cryo cooled 10 T magnet was used with temperatures reaching down to 2 K. Superstructure peaks at (h±1/2, k±1/2, 0) and (0, 2k+1, 0) positions are observed. There is no evidence of magnetic peaks along (0 1 0) or (1 0 0), down to 1.7 K as observed for GdMnO3. At 35 K, integrated intensity of the superstructure peaks increases with increasing field above the critical field of 8.5 T. The exact origin of the superstructure peaks is under investigations.