Spin correlations on a site diluted square lattice heisenberg antiferromagnet covering the percolation threshold

Kazuyoshi Takeda, Osamu Fujita, Masaki Mito, Tatsuya Kawae, Masako Hitaka, Hiroyuki Deguchi, Yoshinori Muraoka, Kazuo Yamagata

Research output: Contribution to journalConference article

Abstract

The reduction of the magnetic ordering temperature has been studied in the quasi-two-dimensional square lattice Heisenberg magnet, Mn(HCOO) 22(NH2)2CO(TN(1)=3.77 K) with the spin value 5=5/2, randomly diluted with non-magnetic Cd2+ ions. It is found that, as the dilution proceeds, the Neel temperature TN(x) goes down toward 0 K around at x=0.65, higher than xp =0.59 for the square lattice, making the contrast to the cases of the diluted Ising system and La2CuO4, a high Tc superconducting parent compound with 5=1/2: The critical index φ in TN(X)∼(x-xp)1/φ is suggested φ<1 for the Heisenberg and φ>1 for the Ising systems.

Original languageEnglish
Pages (from-to)315-320
Number of pages6
JournalMolecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals
Volume376
DOIs
Publication statusPublished - Dec 1 2002
EventProceedings of the Interdisciplinary Symposium on Multifunctionality of Inorganic , Organic, and Their Hybrid Solids - Honolulu, HI, United States
Duration: Dec 15 2000Dec 18 2000

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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