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Uniform structural phase transition in V2 O3 without short-range distortions of the local structure

Journal Article · · Physical Review. B
 [1];  [2];  [3];  [2];  [4]
  1. Brigham Young Univ., Provo, UT (United States); Brigham Young University
  2. Kyoto Univ. (Japan)
  3. Technion–Israel Inst. of Technology, Haifa (Israel)
  4. Brigham Young Univ., Provo, UT (United States)

The local structure of V2O3, an archetypal strongly correlated electron system that displays a metal-insulator transition around 160 K, has been investigated via pair distribution function (PDF) analysis of neutron and x-ray total scattering data. The rhombohedral-to-monoclinic structural phase transition manifests as an abrupt change on all length scales in the observed PDF. No monoclinic distortions of the local structure are found above the transition, although coexisting regions of phase-separated rhombohedral and monoclinic symmetry are observed between 150 K and 160 K. Furthermore this lack of structural fluctuations above the transition contrasts with the known presence of magnetic fluctuations in the high-temperature state, suggesting that the lattice degree of freedom plays a secondary role behind the spin degree of freedom in the transition mechanism.

Research Organization:
Brigham Young Univ., Provo, UT (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Norman Seiden Fellowship for Nanotechnology and Optoelectronics; Israel Science Foundation
Grant/Contract Number:
SC0021134; SC0012704
OSTI ID:
1865550
Alternate ID(s):
OSTI ID: 1837166
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 18 Vol. 104; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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