Dual Orbital Degeneracy Lifting in a Strongly Correlated Electron System

R. J. Koch; R. Sinclair; M. T. McDonnell; R. Yu; M. Abeykoon; M. G. Tucker; A. M. Tsvelik; S. J.L. Billinge; H. D. Zhou; W. G. Yin; E. S. Bozin

doi:10.1103/PhysRevLett.126.186402

Dual Orbital Degeneracy Lifting in a Strongly Correlated Electron System

R. J. Koch, R. Sinclair, M. T. McDonnell, R. Yu, M. Abeykoon, M. G. Tucker, A. M. Tsvelik, S. J.L. Billinge, H. D. Zhou, W. G. Yin, E. S. Bozin

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12 Scopus citations

Abstract

The local structure of NaTiSi2O6 is examined across its Ti-dimerization orbital-assisted Peierls transition at 210 K. An atomic pair distribution function approach evidences local symmetry breaking preexisting far above the transition. The analysis unravels that, on warming, the dimers evolve into a short range orbital degeneracy lifted (ODL) state of dual orbital character, persisting up to at least 490 K. The ODL state is correlated over the length scale spanning ∼6 sites of the Ti zigzag chains. Results imply that the ODL phenomenology extends to strongly correlated electron systems.

Original language	English
Article number	186402
Journal	Physical Review Letters
Volume	126
Issue number	18
DOIs	https://doi.org/10.1103/PhysRevLett.126.186402
State	Published - May 6 2021

Funding

Work at Brookhaven National Laboratory was supported by U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences (DOE-BES) under Contract No. DE-SC0012704. R. S. and H. Z. are thankful for the support from the U.S. Department of Energy under Award No. DE-SC-0020254. Neutron total scattering data were collected at the NOMAD beam line (BL-1B) at the Spallation Neutron Source, a U.S. Department of Energy Office of Science User Facility operated by the Oak Ridge National Laboratory. X-ray PDF measurements were conducted on beam line 28-ID-1 of the National Synchrotron Light Source II, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Brookhaven National Laboratory under Contract No. DE-SC0012704.

Funders	Funder number
DOE-BES	DE-SC0012704, DE-SC-0020254
U.S. Department of Energy
Office of Science
Basic Energy Sciences
Brookhaven National Laboratory

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10.1103/PhysRevLett.126.186402

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title = "Dual Orbital Degeneracy Lifting in a Strongly Correlated Electron System",

abstract = "The local structure of NaTiSi2O6 is examined across its Ti-dimerization orbital-assisted Peierls transition at 210 K. An atomic pair distribution function approach evidences local symmetry breaking preexisting far above the transition. The analysis unravels that, on warming, the dimers evolve into a short range orbital degeneracy lifted (ODL) state of dual orbital character, persisting up to at least 490 K. The ODL state is correlated over the length scale spanning ∼6 sites of the Ti zigzag chains. Results imply that the ODL phenomenology extends to strongly correlated electron systems.",

author = "Koch, {R. J.} and R. Sinclair and McDonnell, {M. T.} and R. Yu and M. Abeykoon and Tucker, {M. G.} and Tsvelik, {A. M.} and Billinge, {S. J.L.} and Zhou, {H. D.} and Yin, {W. G.} and Bozin, {E. S.}",

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doi = "10.1103/PhysRevLett.126.186402",

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AU - Koch, R. J.

AU - Sinclair, R.

AU - McDonnell, M. T.

AU - Yu, R.

AU - Abeykoon, M.

AU - Tucker, M. G.

AU - Tsvelik, A. M.

AU - Billinge, S. J.L.

AU - Zhou, H. D.

AU - Yin, W. G.

AU - Bozin, E. S.

PY - 2021/5/6

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AB - The local structure of NaTiSi2O6 is examined across its Ti-dimerization orbital-assisted Peierls transition at 210 K. An atomic pair distribution function approach evidences local symmetry breaking preexisting far above the transition. The analysis unravels that, on warming, the dimers evolve into a short range orbital degeneracy lifted (ODL) state of dual orbital character, persisting up to at least 490 K. The ODL state is correlated over the length scale spanning ∼6 sites of the Ti zigzag chains. Results imply that the ODL phenomenology extends to strongly correlated electron systems.

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JO - Physical Review Letters

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Dual Orbital Degeneracy Lifting in a Strongly Correlated Electron System

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