Quantum 2D Heisenberg Antiferromagnet: Bridging the Gap between Field-theoretical and Semiclassical Approaches (Articolo in rivista)

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  • Quantum 2D Heisenberg Antiferromagnet: Bridging the Gap between Field-theoretical and Semiclassical Approaches (Articolo in rivista) (literal)
Anno
  • 2003-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevB.68.104406 (literal)
Alternative label
  • Beard B.B., Cuccoli A., Vaia R., Verrucchi P. (2003)
    Quantum 2D Heisenberg Antiferromagnet: Bridging the Gap between Field-theoretical and Semiclassical Approaches
    in Physical review. B, Condensed matter and materials physics
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Beard B.B., Cuccoli A., Vaia R., Verrucchi P. (literal)
Pagina inizio
  • 104406-1 (literal)
Pagina fine
  • 104406-5 (literal)
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  • http://prb.aps.org/abstract/PRB/v68/i10/e104406 (literal)
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  • 68 (literal)
Rivista
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  • Pagine da 104406-1 a 104406-4 (literal)
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  • 5 (literal)
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  • 10 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • - Departments of Physics and Mechanical Engineering of the Christian Brothers University, Memphis, Tennessee 38104, USA - Dipartimento di Fisica dell'Università di Firenze, via G. Sansone 1, I-50019 Sesto Fiorentino (FI), Italy - Istituto Nazionale per la Fisica della Materia, U.d.R. Firenze, via G. Sansone 1, I-50019 Sesto Fiorentino (FI), Italy - Istituto di Fisica Applicata \"Nello Carrara\" del Consiglio Nazionale delle Ricerche, via Panciatichi 56/30, I-50127 Firenze, Italy (literal)
Titolo
  • Quantum 2D Heisenberg Antiferromagnet: Bridging the Gap between Field-theoretical and Semiclassical Approaches (literal)
Abstract
  • The field-theoretical result for the low-T behaviour of the correlation length of the quantum Heisenberg antiferromagnet on the square lattice was recently improved by Hasenfratz [Eur. Phys. J. B 13, 11 (2000)], who corrected for cutoff effects. We show that starting from his expression, and exploiting our knowledge of the classical thermodynamics of the model, it is possible to take into account non-linear effects which are responsible for the main features of the correlation length at intermediate temperature. Moreover, we find that cutoff effects lead to the appearance of an effective exchange integral depending on the very same renormalization coefficients derived in the framework of the semiclassical 'pure-quantum self-consistent harmonic approximation': The gap between quantum field-theoretical and semiclassical results is here eventually bridged. (literal)
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