Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-04-29
Physics
Condensed Matter
Strongly Correlated Electrons
Conference Proceeding of Polarized Neutrons in Condensed Matter Investigations (Tokai, Japan, 2008)
Scientific paper
We used a local susceptibility approach in extensive polarized neutron diffraction studies of the spin liquid \tbti. For a magnetic field applied along the [110] and [111] directions, we found that, at high temperature, all Tb moments are collinear and parallel to the field. With decreasing temperature, the Tb moments reorient from the field direction to their local anisotropy axes. For the [110] field direction, the field induced magnetic structure at 10 K is spin ice-like, but with two types of Tb moments of very different magnitudes. For a field along [111], the magnetic structure resembles the so-called "one in-three out" found in spin ices, with the difference that all Tb moments have an additional component along the [111] direction due to the magnetic field. The temperature evolution of the local susceptibilities clearly demonstrates a progressive change from Heisenberg to Ising behavior of the Tb moments when lowering the temperature, which appears to be a crystal field effect.
Bonville Pierre
Cao Huibo
Gukasov Arsen
Mirebeau Isabelle
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