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Changes in elastic moduli as evidence for quadrupolar ordering in the rare-earth frustrated magnet Tb2Ti2O7

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Zvyagin,  A. A.
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Citation

Gritsenko, Y., Mombetsu, S., Cong, P. T., Stoeter, T., Green, E. L., Mejia, C. S., et al. (2020). Changes in elastic moduli as evidence for quadrupolar ordering in the rare-earth frustrated magnet Tb2Ti2O7. Physical Review B, 102(6): 060403. doi:10.1103/PhysRevB.102.060403.


Cite as: http://hdl.handle.net/21.11116/0000-0007-8694-A
Abstract
Numerous materials feature unexplained phases with invisible or hidden order of electronic origin. A particularly mysterious case is that of Tb2Ti2O7, which avoids magnetic order to the lowest temperatures, but nevertheless has an unexplained second-order phase transition near T = 0.5 K. Our ultrasound measurements of Tb2Ti2O7 provide direct evidence of a huge softening followed by strong hardening of the structural lattice below T = 0.5 K. In the absence of magnetic order at this temperature, our results provide conclusive evidence for the proposed quadrupolar order and emphasize the importance of higher-order multipolar interactions in rare-earth frustrated magnets.