Spin dynamics in highly frustrated pyrochlore magnets

This paper aims at showing the complementarity between time-of-flight and triple-axis neutron scattering experiments, on the basis of two topical examples in the field of geometrical magnetic frustration. Rare earth pyrochlore magnets R2Ti2O7 (R is a rare earth) play a prominent role in this field,...

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Bibliographic Details
Published in:EPJ Web of conferences 2015-01, Vol.83, p.3012-1-03012-7
Main Authors: Petit, Sylvain, Guitteny, Solène, Robert, Julien, Bonville, Pierre, Decorse, Claudia, Ollivier, Jacques, Mutka, Hannu, Mirebeau, Isabelle
Format: Article
Language:English
Subjects:
Acoustic coupling
Antiferromagnetism
Crystals
Environmental Sciences
Exchange
Ground state
Low energy
Magnets
Neutron scattering
Physics
Pyrochlores
Rare earth elements
Rare earth metals
Spin dynamics
Spin liquid
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Summary:This paper aims at showing the complementarity between time-of-flight and triple-axis neutron scattering experiments, on the basis of two topical examples in the field of geometrical magnetic frustration. Rare earth pyrochlore magnets R2Ti2O7 (R is a rare earth) play a prominent role in this field, as they form model systems showing a rich variety of ground states, depending on the balance between dipolar, exchange interactions and crystal field. We first review the case of the XY antiferromagnet Er2 Ti2 O7. Here a transition towards a Néel state is observed, possibly induced by an order-by-disorder mechanism. Effective exchange parameters can be extracted from S(Q,ω). We then examine the case of the spin liquid Tb2 Ti2 O7. Recent experiments reveal a complex ground state characterized by “pinch points” and supporting a low energy excitation. These studies demonstrate the existence of a coupling between crystal field transitions and a transverse acoustic phonon mode.
ISSN:2100-014X
2101-6275
2100-014X
DOI:10.1051/epjconf/20158303012