Quenched-vacancy induced spin-glass order

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GÜLPINAR G., Berker A. N.

PHYSICAL REVIEW E, cilt.79, sa.2, 2009 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 79 Sayı: 2
  • Basım Tarihi: 2009
  • Doi Numarası: 10.1103/physreve.79.021110
  • Dergi Adı: PHYSICAL REVIEW E
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Anahtar Kelimeler: antiferromagnetism, bonds (chemical), ferromagnetic-antiferromagnetic transitions, ferromagnetism, Ising model, lattice theory, magnetic transitions, quenching (thermal), random processes, renormalisation, spin glasses, vacancies (crystal), HIERARCHICAL LATTICES, PHASE-DIAGRAM, SYSTEMS, TEMPERATURE, PERCOLATION, POINT, HEAT
  • Dokuz Eylül Üniversitesi Adresli: Evet

Özet

The ferromagnetic phase of an Ising model in d=3, with any amount of quenched antiferromagnetic bond randomness, is shown to undergo a transition to a spin-glass phase under sufficient quenched bond dilution. This result, demonstrated here with the numerically exact global renormalization-group solution of a d=3 hierarchical lattice, is expected to hold true generally, for the cubic lattice and for quenched site dilution. Conversely, in the ferromagnetic-spin-glass-antiferromagnetic phase diagram, the spin-glass phase expands under quenched dilution at the expense of the ferromagnetic and antiferromagnetic phases. In the ferromagnetic-spin-glass phase transition induced by quenched dilution, reentrance as a function of temperature is seen, as previously found in the ferromagnetic-spin-glass transition induced by increasing the antiferromagnetic bond concentration.