Ground state and low-tying excitations in a Heisenberg spin-glass model in three dimensions

F. Matsubara, T. Shirakura, Saburo Takahashi, Y. Baba

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

We developed a hybrid genetic algorithm and studied the ground state and low-lying excitations of the ±J Heisenberg model on a three-dimensional L X L X L(L ≤ 11) lattice. Our results suggest occurrence of a Parisi state. That is, there exists a metastable state with a finite energy of ΔE ∼ O(J) in the thermodynamic limit and the energy barrier ΔW between the metastable state and the ground state is ΔW ∝ JLθ with θ ∼ 0.53. Our results also suggest that the energy ΔE of small scale excitations are related to a scale of the excitation V in a similar manner to those of the ferromagnetic model, i.e., ΔE ∝ JL θLVθυ with θL ∼ -4.7 and θυ ∼ 2.0. This fact suggests that similarity exists in the ground state structure between the ±J and the ferromagnetic Heisenberg models, though the spin directions of those two models differ greatly from one another.

Original languageEnglish
Article number174414
Pages (from-to)1-7
Number of pages7
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume70
Issue number17
DOIs
Publication statusPublished - 2004 Nov 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Ground state and low-tying excitations in a Heisenberg spin-glass model in three dimensions'. Together they form a unique fingerprint.

  • Cite this