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Title: Magnetization reversal driven by electron localization-delocalization crossover in the inverse spinel Co 2 VO 4

Journal Article · · Physical Review. B
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2];  [3];  [2]; ORCiD logo [2];  [2]; ORCiD logo [4]; ORCiD logo [5];  [5];  [1]; ORCiD logo [2]; ORCiD logo [6]
  1. Univ. i Stavanger (Norway)
  2. Ames Lab., and Iowa State Univ., Ames, IA (United States)
  3. STFC Rutherford Appleton Lab., Oxon (United Kingdom)
  4. Vienna Univ. of Technology (Austria); AGH Univ. of Science and Technology, Krakow (Poland)
  5. Helmholtz Zentrum Berlin für Materialien und Energie, Berlin (Germany)
  6. Technical Univ. of Denmark, Lyngby (Denmark); European Spallation Source, Lund (Sweden)
+ Show Author Affiliations

Neutron diffraction, magnetization, and muon spin relaxation measurements, supplemented by density functional theory (DFT) calculations are employed to unravel temperature-driven magnetization reversal in inverse spinel Co2VO4. All measurements show a second-order magnetic phase transition at TC = 168 K to a collinear ferrimagnetic phase. Neutron diffraction measurements reveal two antiparallel ferromagnetic (FM) sublattices, belonging to magnetic ions on two distinct crystal lattice sites, where the relative balance between the two sublattices determine the net FM moment in the unit cell. As the evolution of the ordered moment with temperature differs between the two sublattices, the net magnetic moment reaches a maximum at TNC = 138 K and reverses its sign at TMR = 65 K. The DFT results suggest that the underlying microscopic mechanism for the reversal is a delocalization of the unfilled 3d -shell electrons on one sublattice just below TC, followed by a gradual localization as the temperature is lowered. Furthermore, this delocalized-localized crossover is supported by muon spectroscopy results, as strong T1 relaxation observed below TC indicates fluctuating internal fields.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
Grant/Contract Number:
AC02-07CH11358
OSTI ID:
1875272
Report Number(s):
IS-J 10,743
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 9 Vol. 105; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
Density functional calculations
Density of states
Ferrimagnetism
Magnetization measurements
Metal-insulator transition
Muon spin relaxation & rotation
Neutron scattering
Oxides
Spinels