Fieldinduced magnetic structures in Tb_{2}Ti_{2}O_{7} at low temperatures: From spinice to spinflip structures
Abstract
We studied the fieldinduced magnetic structures of the Tb_{2}Ti_{2}O_{7} pyrochlore by singlecrystal 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 β chains, with local [111] anisotropy axis perpendicular to the field. For k=0 , spinicelike structures are observed for a misalignment of a few degrees whereas other structures, where the Tbβ 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.
 Publication:

Physical Review B
 Pub Date:
 November 2010
 DOI:
 10.1103/PhysRevB.82.174406
 arXiv:
 arXiv:1008.2979
 Bibcode:
 2010PhRvB..82q4406S
 Keywords:

 71.27.+a;
 61.05.fm;
 75.25.j;
 Strongly correlated electron systems;
 heavy fermions;
 Neutron diffraction;
 Condensed Matter  Strongly Correlated Electrons
 EPrint:
 11 pages, 11 figures, 2 tables