Abstract
We have studied the field-induced magnetic structures in Tb 2Ti2O7, in a wide temperature (0.3<T<270K) and field (0<H<7T) range, by single crystal polarized and unpolarized neutron diffraction, with H [110] axis. A ferromagneticlike structure with k=0 propagation vector is induced, whose local order at low field and low temperature is akin to spin ice. The four Tb ions separate in α and β chains having different values of the magnetic moments, which is quantitatively explained by taking the crystal field anisotropy into account. Above 2 T and below 2 K, an antiferromagneticlike structure with k=(0,0,1) is induced besides the k=0 structure. It shows a reentrant behavior and extends over a finite length scale. It occurs together with a broadening of the nuclear peaks, which suggests a field-induced distortion and magnetostriction effect.
Original language | English |
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Article number | 196402 |
Journal | Physical Review Letters |
Volume | 101 |
Issue number | 19 |
DOIs | |
State | Published - Nov 5 2008 |
Externally published | Yes |