An Investigation of the Magnetic Properties of Sm1−xTiO3forx=0.03, 0.05, and 0.10: Magnetic Structure Determination of Sm0.97TiO3by Short-Wavelength Neutron Diffraction on Single Crystals

Single crystals of Sm0.97TiO3have been prepared and their magnetic properties have been investigated. Dc magnetic susceptibility measurements indicate paramagnetic Curie–Weiss behavior above 100 K whereas two magnetic transitions are observed atTN∼52 K andTN∼40 K. Similar observations for antiferromagnetic behavior have been made for thex=0.05 compound withTN∼40 K whereas for thex=0.10 compound this behavior vanishes. The magnetic structure determination of thex=0.03 compound has been accomplished by using low-temperature single-crystal neutron diffraction. The room temperature crystal structure is a distorted orthorhombic perovskite structure belonging toPnma, which is preserved down to 15 K. The magnetic structure is found to be consistent with aGxGymoment configuration on the Ti(III) sublattice and aCzmoment configuration on the Sm(III) sublattice. The magnetic moments are estimated to be 0.72(1) and 0.43(1)μBon the Ti(III) and Sm(III) sublattices, respectively. The orientations of the moments were found to be 7(3)° to thex-axis for Ti(III) and 2(2)° to thez-axis for Sm(III).