title: Antiferromagnetic ground state of quantum spins in the synthetic imanite, Ca3Ti2Si3O12: the lost child of the garnet family.
abstract: Large single crystals of the garnet imanite, Ca(3)Ti(2)Si(3)O(12), were synthesized by a floating zone technique. Near-infrared to visible spectroscopy presents an optical gap of 1.65 eV at 4 K, proving the insulating character of this garnet compound. Electron paramagnetic resonance data indicate that the d(1) electron of Ti(3+) exhibits an orbital contribution to the spin moment (g = 1.859(1)). An antiferromagnetic state is observed below T(N) = 7 K, confirmed by magnetic susceptibility and specific heat data. X-ray diffraction investigations on powders and single crystals of imanite reveal that the crystal structure agrees well with expectations: the cubic symmetry Ia3d describes all obtained single crystal and powder diffraction data.
authors: II. Physics Department, University of Cologne, Zülpicher strasse 77, D-50937 Cologne, Germany. valldor@ph2.uni-koeln.de
authors: Martin
authors: M
authors: Valldor
authors: André
authors: A
authors: Uthe
authors: Reinhard
authors: R
authors: Rückamp