The crystal and magnetic structures of the (Nd1-xSr x)(Mn1-xRux)O3 perovskites have been studied by neutron powder diffraction and muon spin relaxation. The simultaneous and consistent doping of the A- and B-sites with Sr and Ru has been used for avoiding the Mn4+ formation and hence, suppression of the double exchange. All studied samples (0≤×≤0.875) are insulators and show unusual long-range ferromagnetic state, which can be called "statistical ferrimagnet," with antiferromagnetic coupling between Mn and Ru magnetic moments, and ferromagnetic coupling in the Mn-Mn and Ru-Ru pairs.
|Original language||English (US)|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - Jul 2004|
Bibliographical noteFunding Information:
The authors are grateful to P. Fischer and N. M. Plakida for helpful discussions. The work was done with the help of the Russian program RFBR (projects 00-02-16736 and 02-03-33258), the INTAS foundation (project 01-2008) and the Swiss foundation SNSF (project 7SUPJ062190.00/1). This work was partially performed at the spallation neutron source SINQ, Paul Scherrer Institut, Villigen, Switzerland.