Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-08-17
Phys. Rev. B 82, 174406 (2010)
Physics
Condensed Matter
Strongly Correlated Electrons
11 pages, 11 figures, 2 tables; minor changes; published
Scientific paper
10.1103/PhysRevB.82.174406
We studied the field-induced magnetic structures of the Tb2Ti2O7 pyrochlore by single-crystal neutron diffraction with a magnetic field applied along a [110] axis, focusing on the influence of a small misalignment. Both induced magnetic structures with k=0 and k=(0,0,1) propagation vectors are found to be sensitive to the misalignment, which controls the magnitude and orientation of the Tb moments involved in the beta chains, with local [111] anisotropy axis perpendicular to the field. For k=0, spin-ice-like structures are observed for a misalignment of a few degrees, whereas other structures, where the Tb-beta moments flip by "melting" on the field axis, occur when the field is perfectly aligned. The field evolution of the k=0 structure is well reproduced by a molecular field model with anisotropic exchange. We give a complete symmetry analysis of the k=0 and k=(0,0,1) magnetic structures, both being described by the basis functions of single irreducible representations.
Bonville Pierre
Cao Hui
Dhalenne Guy
Grenier Beatrice
Gukasov Arsen
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