Magnetism and superconductivity in the t-t '-J model (Articolo in rivista)

Type
Label
  • Magnetism and superconductivity in the t-t '-J model (Articolo in rivista) (literal)
Anno
  • 2008-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevB.77.024510 (literal)
Alternative label
  • Spanu, L; Lugas, M; Becca, F; Sorella, S (2008)
    Magnetism and superconductivity in the t-t '-J model
    in Physical review. B, Condensed matter and materials physics
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Spanu, L; Lugas, M; Becca, F; Sorella, S (literal)
Pagina inizio
  • 024510 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 77 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 9 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 2 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • INFM Democritos, Natl Simulat Ctr, I-34014 Trieste, Italy; SISSA, Int Sch Adv Studies, I-34014 Trieste, Italy (literal)
Titolo
  • Magnetism and superconductivity in the t-t '-J model (literal)
Abstract
  • We present a systematic study of the phase diagram of the t-t'-J model by using the Green's function Monte Carlo (GFMC) technique, implemented within the fixed-node (FN) approximation and a wave function that contains both antiferromagnetism and d-wave pairing. This enables us to study the interplay between these two kinds of order and compare the GFMC results with the ones obtained by the simple variational approach. By using a generalization of the forward-walking technique, we are able to calculate true FN ground-state expectation values of the pair-pair correlation functions. In the case of t'=0, there is a large region with a coexistence of superconductivity and antiferromagnetism that survives up to delta(c)similar to 0.10 for J/t=0.2, and delta(c)similar to 0.13 for J/t=0.4. The presence of a finite t'/t < 0 induces a strong suppression of both magnetic (with delta(c)less than or similar to 0.03 for J/t=0.2 and t'/t=-0.2) and pairing correlations. In particular, the latter ones are depressed both in the low-doping regime and around delta similar to 0.25, where strong size effects are present. (literal)
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