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

Abstract

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.

Authors:
; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1441090
Alternate Identifier(s):
OSTI ID: 1263910
Report Number(s):
BNL-112301-2016-JA
Journal ID: ISSN 0036-8075; /sci/352/6290/1206.atom
Grant/Contract Number:  
SC00112704; NSF-DMR-1310008
Resource Type:
Published Article
Journal Name:
Science
Additional Journal Information:
Journal Name: Science Journal Volume: 352 Journal Issue: 6290; Journal ID: ISSN 0036-8075
Publisher:
American Association for the Advancement of Science (AAAS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

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., and Aronson, M. C. Orbital-exchange and fractional quantum number excitations in an f-electron metal, Yb 2 Pt 2 Pb. United States: N. p., 2016. Web. doi:10.1126/science.aaf0981.
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. Orbital-exchange and fractional quantum number excitations in an f-electron metal, Yb 2 Pt 2 Pb. United States. doi:10.1126/science.aaf0981.
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., and Aronson, M. C. Thu . "Orbital-exchange and fractional quantum number excitations in an f-electron metal, Yb 2 Pt 2 Pb". United States. doi:10.1126/science.aaf0981.
@article{osti_1441090,
title = {Orbital-exchange and fractional quantum number excitations in an f-electron metal, Yb 2 Pt 2 Pb},
author = {Wu, L. S. and Gannon, W. J. and Zaliznyak, I. A. and Tsvelik, A. M. and Brockmann, M. and Caux, J. -S. and Kim, M. S. and Qiu, Y. and Copley, J. R. D. and Ehlers, G. and Podlesnyak, A. and Aronson, M. C.},
abstractNote = {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.},
doi = {10.1126/science.aaf0981},
journal = {Science},
number = 6290,
volume = 352,
place = {United States},
year = {2016},
month = {6}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1126/science.aaf0981

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Cited by: 8 works
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