Abstract:
The present study focuses on electronic correlation effects on magnetic energy, the spin-spin correlation function of an octahedron cluster in the (3↑, 3 ↓) electronic configuration threaded by a magnetic field. Some other spin configurations are also discussed and various field directions are considered. An accurate diagonalisation technique has been used to solve the Hubbard Hamiltonian. A result is analysed on a linear energy stabilisation at low magnetic flux. Moreover, two types of antiferromagnetic transition versus the flux occurring for a correlation term larger than a critical one have been observed, i.e. the likelihood of a charge excitation before the antiferromagnetic transition. Finally, a comparison between the results obtained from the exact diagonalisation and the Gutzwiller method has been carried out, leading to a suggested modification of the Gutzwiller approach in order to improve it.
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Received 23 June 1999 and Received in final form 28 July 2000
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Tarento, R., Joyes, P. & van de Walle, J. Electronic correlation effects on the properties of an half-filled octahedron cluster in a magnetic field. Eur. Phys. J. D 13, 355–360 (2001). https://doi.org/10.1007/s100530170252
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DOI: https://doi.org/10.1007/s100530170252