Orbital-exchange and fractional quantum number excitations in an f-electron metal, Yb 2 Pt 2 Pb

Wu, L. S.; Gannon, W. J.; Zaliznyak, I. A.; Tsvelik, A. M.; Brockmann, M.; Caux, J. -S.; Kim, M. S.; Qiu, Y.; Copley, J. R. D.; Ehlers, G.; Podlesnyak, A.; Aronson, M. C.

doi:10.1126/science.aaf0981

Title: Orbital-exchange and fractional quantum number excitations in an f-electron metal, Yb ₂ Pt ₂ Pb

Journal Article · Thu Jun 02 00:00:00 EDT 2016 · Science

DOI:https://doi.org/10.1126/science.aaf0981· OSTI ID:1441090

Wu, L. S.; Gannon, W. J.; Zaliznyak, I. A.; Tsvelik, A. M.; Brockmann, M.; Caux, J. -S.; Kim, M. S.; Qiu, Y.; Copley, J. R. D.; Ehlers, G.; Podlesnyak, A.; Aronson, M. C.

Exotic quantum states and fractionalized magnetic excitations, such as spinons in one-dimensional chains, are generally expected to occur in 3d transition metal systems with spin 1/2. Our neutron-scattering experiments on the 4f-electron metal Yb₂Pt₂Pb overturn this conventional wisdom. We observe broad magnetic continuum dispersing in only one direction, which indicates that the underlying elementary excitations are spinons carrying fractional spin-1/2. These spinons are the emergent quantum dynamics of the anisotropic, orbital-dominated Yb moments. Owing to their unusual origin, only longitudinal spin fluctuations are measurable, whereas the transverse excitations such as spin waves are virtually invisible to magnetic neutron scattering. Furthermore, the proliferation of these orbital-spinons strips the electrons of their orbital identity, resulting in charge-orbital separation.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC00112704; NSF-DMR-1310008

OSTI ID:: 1441090

Alternate ID(s):: OSTI ID: 1263910

Report Number(s):: BNL-112301-2016-JA; /sci/352/6290/1206.atom

Journal Information:: Science, Journal Name: Science Vol. 352 Journal Issue: 6290; ISSN 0036-8075

Publisher:: American Association for the Advancement of Science (AAAS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 60 works

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Title: Orbital-exchange and fractional quantum number excitations in an f-electron metal, Yb 2 Pt 2 Pb

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Title: Orbital-exchange and fractional quantum number excitations in an f-electron metal, Yb ₂ Pt ₂ Pb