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Title: Magnetic order-disorder transitions on a one-third-depleted square lattice

Journal Article · · Physical Review B
 [1];  [2];  [3];  [3]
  1. Beihang Univ., Beijing (China). Dept. of Physics; Univ. of California, Davis, CA (United States). Dept. of Physics
  2. Univ. of California, Davis, CA (United States). Dept. of Physics; Univ. Federal do Rio de Janei, Rio de Janeiro (Brazil). Inst. de Fisica
  3. Univ. of California, Davis, CA (United States). Dept. of Physics

Quantum Monte Carlo simulations are used to study the magnetic and transport properties of the Hubbard Model, and its strong coupling Heisenberg limit, on a one-third depleted square lattice. This is the geometry occupied, after charge ordering, by the spin-$$\frac{1}{2}$$ Ni1+ atoms in a single layer of the nickelate materials La4Ni3O8 and (predicted) La3Ni2O6. Our model is also a description of strained graphene, where a honeycomb lattice has bond strengths which are inequivalent. For the Heisenberg case, we determine the location of the quantum critical point (QCP) where there is an onset of long range antiferromagnetic order (LRAFO), and the magnitude of the order parameter, and then compare with results of spin wave theory. An ordered phase also exists when electrons are itinerant. Finally, in this case, the growth in the antiferromagnetic structure factor coincides with the transition from band insulator to metal in the absence of interactions.

Research Organization:
Univ. of California, Davis, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
SC0014671; FG02-04ER46111
OSTI ID:
1477009
Alternate ID(s):
OSTI ID: 1339772
Journal Information:
Physical Review B, Vol. 95, Issue 4; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 5 works
Citation information provided by
Web of Science

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