Low-energy magneto-optics of Tb2Ti2O7 in a [111] magnetic field

Zhang, Xinshu; Luo, Yi; Halloran, T.; Gaudet, J.; Man, Huiyuan; Koohpayeh, S. M.; Armitage, N. P.

doi:10.1103/physrevb.103.l140403

Low-energy magneto-optics of Tb2 Ti2 O7 in a [111] magnetic field

Journal Article · Mon Apr 12 00:00:00 EDT 2021 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.103.l140403· OSTI ID:1853091

^[1]; Luo, Yi ^[2]; Halloran, T. ^[2]; Gaudet, J. ^[2]; ^[2]; Koohpayeh, S. M. ^[2]; Armitage, N. P. ^[2]

Johns Hopkins Univ., Baltimore, MD (United States); OSTI
Johns Hopkins Univ., Baltimore, MD (United States)

The pyrochlore magnet Tb₂ Ti₂O₇ shows a lack of magnetic order to low temperatures and is considered to be a quantum spin liquid candidate. Here we perform time-domain THz spectroscopy on high-quality Tb₂Ti₂O₇ crystals and study the low-energy excitations as a function of [111] magnetic field with high energy resolution. The low-energy crystal-field excitations change their energies anomalously under magnetic field. Despite several sharp field-dependent changes, we show that the material's spectrum can be described not by phase transitions but by field-dependent hybridization between the low-energy crystal-field levels. We highlight the strong coupling between spin and lattice degrees of freedom in Tb₂Ti₂O₇ as evidenced by the magnetic-field tunable crystal-field environment. Calculations based on single ion physics with field-induced symmetry reduction of the crystal-field environment can reproduce our data.

View Accepted Manuscript (DOE)

Research Organization:: Johns Hopkins Univ., Baltimore, MD (United States); Energy Frontier Research Centers (EFRC) (United States). Institute for Quantum Matter

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0019331

OSTI ID:: 1853091

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 14 Vol. 103; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Low-energy magneto-optics of Tb2 Ti2 O7 in a [111] magnetic field

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