Local structure investigation of Co-Fe-Si-B ribbons by extended X-ray absorption fine-structure spectroscopy.

In the present work, extended X-ray absorption fine-structure (EXAFS) investigations of CoFeSiB (x = 3, 5, 7) glassy ribbons were performed at the Co K-edge. The magnitude of the first peak of the Fourier transforms of the EXAFS signals is found to increase monotonically with increasing Si concentrations indicating the formation of the localized ordered structure at the atomic scale. The Co-Si coordination number (CN) increases at the expense of the CN of Co/Fe.

Temperature and impurity effect on parallel field magnetoconductance of bulk insulating topological insulator (Bi Sb )Te.

We have performed a systematic parallel field magnetotransport studies of (Bi Sb )Te to understand the temperature and impurity effect on the interference of bulk conductance on the surface states of highly insulating topologically insulating compound BiTe. The compound exhibits a weak antilocalization effect (WAL) at low temperature and low magnetic field. WAL weakens and a weak localization effect is observed to be developed in the compound with the increase in temperature due to the creation of topologically trivial 2D electron gas states.

Local structure around Mn and Co in LaMn(1-x)Co(x)O(3 ± δ): an EXAFS study.

Detailed investigations of extended x-ray absorption fine structure (EXAFS) associated with the K-edges of Mn and Co have been carried out for LaMn(1-x)Co(x)O(3 ± δ) (0.3≤x≤1) compounds. It is found that the local structure around Mn is different from that around Co.