Vortex contribution to the defect-induced alternating magnetization in 2D antiferromagnets (Articolo in rivista)

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Label
  • Vortex contribution to the defect-induced alternating magnetization in 2D antiferromagnets (Articolo in rivista) (literal)
Anno
  • 2010-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1088/1742-6596/200/2/022003 (literal)
Alternative label
  • Alessandro Cuccoli (1); Ruggero Vaia (2) (2010)
    Vortex contribution to the defect-induced alternating magnetization in 2D antiferromagnets
    in Journal of physics. Conference series (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Alessandro Cuccoli (1); Ruggero Vaia (2) (literal)
Pagina inizio
  • 022003-1 (literal)
Pagina fine
  • 022003-4 (literal)
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  • http://iopscience.iop.org/1742-6596/200/2/022003 (literal)
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  • 200 (literal)
Rivista
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  • Section (2). (Journal of Physics-Conference Series); International Conference on Magnetism (ICM 2009), July 26-31, 2009, Karlsruhe, Germany. IOp Publishing. (literal)
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  • 4 (literal)
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  • 2 (literal)
Note
  • Scopu (literal)
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  • (1) Dipartimento di Fisica, Università di Firenze e Unità CNISM, via G. Sansone 1, I-50019 Sesto Fiorentino (FI), Italy (2) Istituto dei Sistemi Complessi, Consiglio Nazionale delle Ricerche, via Madonna del Piano 10, I-50019 Sesto Fiorentino (FI), Italy (literal)
Titolo
  • Vortex contribution to the defect-induced alternating magnetization in 2D antiferromagnets (literal)
Abstract
  • Quantum Monte Carlo (MC) simulations of the 2D S=1/2 Heisenberg antiferromagnet (AFM) with a vacancy and an applied magnetic field [1] showed that the characteristic decay length of the alternating magnetization around the defect displays an unexpected maximum in the neighborhood of the Berezinskii-Kosterlitz-Thouless (BKT) transition temperature. Given the role played in the BKT transition by vortex excitations, we investigated their contribution to the alternating-order behaviour, showing that isolated vortices modulate the parameters entering the effective model introduced in [1]: the temperature dependence of the vortex population allows us to explain the observed behaviour of the alternating-order decay length. We support such conclusions with MC simulations of the classical AFM, which also reveal some differences between the quantum and the classical model. (literal)
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