Thermodynamics of Quantum 2d Heisenberg magnets with intermediate spin (Comunicazione a convegno)

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  • Thermodynamics of Quantum 2d Heisenberg magnets with intermediate spin (Comunicazione a convegno) (literal)
Anno
  • 2008-01-01T00:00:00+01:00 (literal)
Alternative label
  • A.Cuccoli, G.Gori, R.Vaia, P.Verrucchi (2008)
    Thermodynamics of Quantum 2d Heisenberg magnets with intermediate spin
    in International Conference on Path Integrals - New Trends and Perspectives, Dresden, 23-28/09/2007
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • A.Cuccoli, G.Gori, R.Vaia, P.Verrucchi (literal)
Pagina inizio
  • 329 (literal)
Pagina fine
  • 334 (literal)
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  • Path Integrals - New Trends and Perspectives (literal)
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  • 6 (literal)
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  • - Dipartimento di Fisica, Università di Firenze, Via G. Sansone 1, 50019 Sesto Fiorentino (FI), Italy - Istituto dei Sistemi Complessi, Consiglio Nazionale delle Ricerche, Via Madonna del Piano 10, 50019 Sesto Fiorentino (FI), Italy - Centro di Ricerca e Sviluppo SMC dell'Istituto Nazionale di Fisica della Materia CNR, Sezione di Firenze, Via G. Sansone 1, 50019 Sesto Fiorentino (FI), Italy (literal)
Titolo
  • Thermodynamics of Quantum 2d Heisenberg magnets with intermediate spin (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#isbn
  • 981-283-726-4 (literal)
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  • W.Janke, A.Pelster (literal)
Abstract
  • By Hamiltonian path-integration a purely-quantum, self-consistent, spin-wave approximation can be developed for spin models on a lattice, that finally allows to map the original quantum problem to a classical one ruled by an effective classical spin Hamiltonian. Such approach has revealed especially valuable to investigate systems with S>1/2 which cannot be easily addressed by other methods. This has made possible to quantitatively interpret experimental data for intermediate-spin compounds and to study how different observables reach the classical limit by increasing S. Here, we focus on the spin-flop phase of a quantum 2D antiferromagnet frustrated by an applied magnetic field that acts as an effective easy-plane anisotropy and determines Berezinskii-Kosterlitz-Thouless (BKT) behavior. By acting on the field one can tune the BKT transition temperature, giving a unique opportunity to observe the otherwise elusive BKT critical behavior in real magnetic systems. The calculated data are shown to well concur with the experimental findings for the S=5/2 compound manganese-formate-dihydrate. (literal)
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