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Direct Observation of Collective Electronuclear Modes about a Quantum Critical Point

Libersky, M. and McKenzie, R. D. and Silevitch, D. M. and Stamp, P. C. E. and Rosenbaum, T. F. (2021) Direct Observation of Collective Electronuclear Modes about a Quantum Critical Point. Physical Review Letters, 127 (20). Art. No. 207202. ISSN 0031-9007. doi:10.1103/PhysRevLett.127.207202.

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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.

Item Type:Article
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URLURL TypeDescription Paper
McKenzie, R. D.0000-0001-5265-7635
Silevitch, D. M.0000-0002-6347-3513
Alternate Title:Direct Measurement of the Soft Mode Driving a Quantum Phase Transition
Additional Information:© 2021 American Physical Society. Received 12 January 2021; revised 12 July 2021; accepted 13 October 2021; published 12 November 2021. The experimental work at Caltech was supported by the U.S. Department of Energy Basic Energy Sciences Award No. DE-SC0014866. P. C. E. S. acknowledges support at Caltech from Simons Foundation Grant No. 568762 and National Science Foundation Grant No. PHY-1733907. Theoretical work at UBC was supported by the National Sciences and Engineering Research Council of Canada, No. RGPIN-2019-05582.
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0014866
Simons Foundation568762
Natural Sciences and Engineering Research Council of Canada (NSERC)RGPIN-2019-05582
Issue or Number:20
Record Number:CaltechAUTHORS:20210202-095237849
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:107858
Deposited By: George Porter
Deposited On:03 Feb 2021 21:32
Last Modified:23 Nov 2021 16:48

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