Direct Observation of Collective Electronuclear Modes about a Quantum Critical Point

Libersky, M.; McKenzie, R.  D.; Silevitch, D.  M.; Stamp, P.  C. E.; Rosenbaum, T.  F.

doi:10.1103/physrevlett.127.207202

Direct Observation of Collective Electronuclear Modes about a Quantum Critical Point

Journal Article · Fri Nov 12 00:00:00 EST 2021 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.127.207202· OSTI ID:1980229

Libersky, M. ^[1]; McKenzie, R. D. ^[2]; ^[3]; Stamp, P. C. E. ^[2]; Rosenbaum, T. F. ^[3]

California Institute of Technology (CalTech), Pasadena, CA (United States); OSTI
Univ. of British Columbia, Vancouver, BC (Canada)
California Institute of Technology (CalTech), Pasadena, CA (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: California Institute of Technology (CalTech), Pasadena, CA (United States)

Sponsoring Organization:: National Science Foundation (NSF); Simons Foundation; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0014866

OSTI ID:: 1980229

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 20 Vol. 127; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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