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Volumn 79, Issue 21, 2009, Pages

Extension of the spin- 1 2 frustrated square lattice model: The case of layered vanadium phosphates

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EID: 67650076991     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.79.214417     Document Type: Article
Times cited : (107)

References (66)
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    • Note that the exchange constants of the order of 10 K are at least 9 orders of magnitude smaller than the total energy per unit cell.
    • Note that the exchange constants of the order of 10 K are at least 9 orders of magnitude smaller than the total energy per unit cell.
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    • To estimate the accuracy of the FD simulations for the FSL model, one should compare the magnetic susceptibility and the specific heat at α=0 with the results of quantum Monte-Carlo (QMC) simulations for the same, unfrustrated square lattice. The latter simulations are less computationally exhaustive and can be performed for sufficiently large clusters. According to the FD results of Ref., the susceptibility maximum for the unfrustrated square lattice is found at Tmax 1.1J, while the QMC results converge to Tmax 0.9J
    • To estimate the accuracy of the FD simulations for the FSL model, one should compare the magnetic susceptibility and the specific heat at α=0 with the results of quantum Monte-Carlo (QMC) simulations for the same, unfrustrated square lattice. The latter simulations are less computationally exhaustive and can be performed for sufficiently large clusters. According to the FD results of Ref., the susceptibility maximum for the unfrustrated square lattice is found at Tmax 1.1J, while the QMC results converge to Tmax 0.9J
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    • Assuming similar FM contributions to all the NN couplings, one can suggest that the very small t1 in Pb2 VO (PO4) 2 implies similar (and FM) interactions along the b axis, despite two different superexchange pathways are present (see Sec. 2). This conclusion can be further supported by LSDA+U calculations (not shown) and justifies our consideration of Pb2 VO (PO4) 2 as the close analog of the other AA′ VO (PO4) 2 compounds.
    • Assuming similar FM contributions to all the NN couplings, one can suggest that the very small t1 in Pb2 VO (PO4) 2 implies similar (and FM) interactions along the b axis, despite two different superexchange pathways are present (see Sec. 2). This conclusion can be further supported by LSDA+U calculations (not shown) and justifies our consideration of Pb2 VO (PO4) 2 as the close analog of the other AA′ VO (PO4) 2 compounds.
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    • Note that Ud, the Coulomb repulsion parameter of LSDA+U, is applied to atomic orbitals. This is different from Ueff, the effective on-site Coulomb repulsion in the mixed vanadium-oxygen band. In general, the Ud and Ueff values do not coincide.
    • Note that Ud, the Coulomb repulsion parameter of LSDA+U, is applied to atomic orbitals. This is different from Ueff, the effective on-site Coulomb repulsion in the mixed vanadium-oxygen band. In general, the Ud and Ueff values do not coincide.


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