Double Vibronic process in the quantum spin ice candidate Tb\(_2\)Ti\(_2\)O\(_7\) revealed by terahertz spectroscopy

The origin of quantum fluctuations responsible for the spin liquid state in Tb\(_2\)Ti\(_2\)O\(_7\) has remained a long standing problem. By synchrotron-based terahertz measurements, we show evidence of strong coupling between the magnetic and lattice degrees of freedom that provides a path to the q...

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Bibliographic Details
Published in:arXiv.org 2017-02
Main Authors: Constable, E, Ballou, R, Robert, J, Decorse, C, J -B Brubach, Roy, P, Lhotel, E, Del-Rey, L, Simonet, V, Petit, S, deBrion, S
Format: Article
Language:English
Subjects:
Electric fields
Quantum phenomena
Spin ice
Spin liquid
Online Access:Get full text
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Summary:The origin of quantum fluctuations responsible for the spin liquid state in Tb\(_2\)Ti\(_2\)O\(_7\) has remained a long standing problem. By synchrotron-based terahertz measurements, we show evidence of strong coupling between the magnetic and lattice degrees of freedom that provides a path to the quantum melting process. As revealed by hybrid crystal electric field-phonon excitations that appear at 0.67 THz below 200 K, and around 0.42 THz below 50 K, the double vibronic process is unique for Tb\(^{3+}\) in the titanate family due to adequate energy matching and strong quadrupolar moments. The results suggest that lattice motion can indeed be the driving force behind spin flips within the hybridized ground and first excited states, promoting quantum terms in the effective Hamiltonian that describes Tb\(_2\)Ti\(_2\)O\(_7\).
ISSN:2331-8422
DOI:10.48550/arxiv.1609.01895