Direct Observation of Collective Electronuclear Modes about a Quantum Critical Point

We directly measure the low energy excitation modes of the quantum Ising magnet LiHoF4 using microwave spectroscopy. Instead of a single electronic mode, we find a set of collective electronuclear modes, in which the spin- 1/2 Ising electronic spins hybridize with the bath of spin- 7/2 Ho nuclear sp...

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Bibliographic Details
Published in:Physical review letters 2021-11, Vol.127 (20), p.1-207202, Article 207202
Main Authors: Libersky, M., McKenzie, R. D., Silevitch, D. M., Stamp, P. C. E., Rosenbaum, T. F.
Format: Article
Language:English
Subjects:
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Critical point
Electron spin
Ising model
magnetic phase transitions
magnons
Physics
quantum phase transitions
Rapid quenching (metallurgy)
spin state transition
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Summary:We directly measure the low energy excitation modes of the quantum Ising magnet LiHoF4 using microwave spectroscopy. Instead of a single electronic mode, we find a set of collective electronuclear modes, in which the spin- 1/2 Ising electronic spins hybridize with the bath of spin- 7/2 Ho nuclear spins. The lowest-lying electronuclear mode softens at the approach to the quantum critical point, even in the presence of disorder. This softening is rapidly quenched by a longitudinal magnetic field. Similar electronuclear structures should exist in other spin-based quantum Ising systems.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.127.207202