Field-induced spin-ice-like orders in spin liquid Tb2Ti2O7.
Phys Rev Lett
; 101(19): 196402, 2008 Nov 07.
Article
em En
| MEDLINE
| ID: mdl-19113288
ABSTRACT
We have studied the field-induced magnetic structures in Tb2Ti2O7, in a wide temperature (0.3 < T < 270 K) and field (0 < H < 7 T) range, by single crystal polarized and unpolarized neutron diffraction, with H parallel[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 alpha and beta 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.
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MEDLINE
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En
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Phys Rev Lett
Ano de publicação:
2008
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Article