Effect of the oxygen deficiencies creation on the suppression of the diamagnetic behavior of SrTiO3 compound

The appearance of ferromagnetic order in the presence of oxygen vacancies has been investigated in SrTiO3 compound, which is paraelectric and paramagnetic down to low temperature. However, incorporation of vacancy makes the system metallic and clear ferromagnetic hysteresis loop is observed at low temperature. X-Ray diffraction revealed that samples crystallize in the cubic structure with the Pm3m space group. From magnetization measurements versus temperature under the field-cooled (FC) and zero-field-cooled (ZFC) modes, we deduced the presence of a spin-glass behavior characterized by a distinctive separation of the FC and ZFC curves. This behavior was found to become more important, as increasing the oxygen-deficiency (delta). (C) 2016 Elsevier B.V. All rights reserved.