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Magnetic correlations in a classic Mott system

Technical Report ·
DOI:https://doi.org/10.2172/672105· OSTI ID:672105
 [1];  [2];  [3];  [4];  [5];  [6]; ;  [7]
  1. Brookhaven National Lab., Upton, NY (United States)
  2. Johns Hopkins Univ., Baltimore, MD (United States)
  3. NEC, Princeton, NJ (United States)
  4. Univ. of California, Santa Cruz, CA (United States)
  5. Oak Ridge National Lab., TN (United States)
  6. ISIS, Oxon (United Kingdom). Rutherford Appleton Lab.
  7. Purdue Univ., West Lafayette, IN (United States)
+ Show Author Affiliations
The metal-insulator transition in V{sub 2}O{sub 3} causes a fundamental change in its magnetism. While the antiferromagnetic insulator (AFI) is a Heisenberg localized spin system, the antiferromagnetism in the strongly correlated metal is determined by a Fermi surface instability. Paramagnetic fluctuations in the metal and insulator represent similar spatial spin correlations, but are unrelated to the long range order in the AFI. The phase transition to the AFI induces an abrupt switching of magnetic correlations to a different magnetic wave vector. The AFI transition, therefore, is not a conventional spin order-disorder transition. Instead it is accounted for by an ordering in the occupation of the two degenerate d-orbitals at the Fermi level.
Research Organization:
Oak Ridge National Lab., TN (United States); Purdue Univ., West Lafayette, IN (United States); Brookhaven National Lab., Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Energy Research, Washington, DC (United States); National Science Foundation, Washington, DC (United States)
DOE Contract Number:
AC05-96OR22464; FG02-90ER45427; AC02-76CH00016
OSTI ID:
672105
Report Number(s):
ORNL/CP--97289; BNL--64816; CONF-970713--; ON: DE98004823; BR: KC0202010; CNN: Grant DMR-9453362
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
ANTIFERROMAGNETISM
CORRELATIONS
EXPERIMENTAL DATA
FERMI LEVEL
L-S COUPLING
MAGNETIC PROPERTIES
TRANSITION TEMPERATURE
VANADIUM OXIDES