Magnetic anomaly of Y1-xSrxVO3-delta

YVO3-SrVO3 system, in which the valence of vanadium ion varies depending on the contents of the oxygen and strontium ion, has been investigated magnet ically and electronically to know the behavior of the strongly correlated e lectron. YVO3-delta, a Mott-type insulator with a perovskite structure, is found to exhibit an anomalous magnetic behavior and interpreted to be based on the parasitic ferromagnetism proposed by Dzyaloshinsky and Moriya [T. M oriya, Phys. Rev. 117 (1960) 635]. The energy gap and the intensity of the anomalous peak in the field cooling process are reduced with the increase o f Sr molar fraction in Y1-xSrxVO3-delta. (C) 1999 Elsevier Science B.V. All rights reserved.