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Title: Measurement of collective excitations in VO 2 by resonant inelastic x-ray scattering

Vanadium dioxide is of broad interest as a spin-1/2 electron system that realizes a metal-insulator transition near room temperature, due to a combination of strongly correlated and itinerant electron physics. Here, resonant inelastic x-ray scattering is used to measure the excitation spectrum of charge and spin degrees of freedom at the vanadium L edge under different polarization and temperature conditions, revealing excitations that differ greatly from those seen in optical measurements. Furthermore, these spectra encode the evolution of short-range energetics across the metal-insulator transition, including the low-temperature appearance of a strong candidate for the singlet-triplet excitation of a vanadium dimer.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [4] ;  [5] ;  [6] ;  [1] ;  [5] ;  [7] ;  [8] ;  [8] ;  [5] ;  [9] ;  [8] ;  [4] ;  [4] ;  [5] ;  [1]
  1. New York Univ., New York, NY (United States)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States); Temple Univ., Philadelphia, PA (United States)
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States); Univ. of Amsterdam (The Netherlands)
  4. IBM Almaden Research Center, San Jose, CA (United States)
  5. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  6. New York Univ., New York, NY (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  7. Paul Scherrer Inst. (PSI), Villigen (Switzerland); Chinese Academy of Sciences (CAS), Beijing (China)
  8. Paul Scherrer Inst. (PSI), Villigen (Switzerland)
  9. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Grant/Contract Number:
DMR-1420073; W911NF-15-1-0181; AC02-76SF00515; AC02-05CH11231
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 94; Journal Issue: 16; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1348931
Alternate Identifier(s):
OSTI ID: 1329510; OSTI ID: 1468335