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Titolo:
Quantum ferrimagnetism based on organic biradicals with a spin-0 ground state: Numerical calculations of molecule-based ferrimagnetic spin chains
Autore:
Shiomi, D; Sato, K; Takui, T;
Indirizzi:
Osaka City Univ, Dept Mat Sci, Grad Sch Sci, Sumiyoshi Ku, Osaka 5588585, Japan Osaka City Univ Osaka Japan 5588585 , Sumiyoshi Ku, Osaka 5588585, Japan Osaka City Univ, Grad Sch Sci, Dept Chem, Sumiyoshi Ku, Osaka 5588585, Japan Osaka City Univ Osaka Japan 5588585 , Sumiyoshi Ku, Osaka 5588585, Japan
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 15, volume: 105, anno: 2001,
pagine: 2932 - 2938
SICI:
1520-6106(20010419)105:15<2932:QFBOOB>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
NITROPHENYL NITRONYL NITROXIDE; SIMPLE CLASSICAL PICTURES; MAGNETIC-PROPERTIES; CRYSTAL-STRUCTURE; BREAKDOWN; DESIGN; SYSTEM;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
28
Recensione:
Indirizzi per estratti:
Indirizzo: Takui, T Osaka City Univ, Dept Mat Sci, Grad Sch Sci, Sumiyoshi Ku, Osaka 5588585, Japan Osaka City Univ Osaka Japan 5588585 hi Ku, Osaka 5588585, Japan
Citazione:
D. Shiomi et al., "Quantum ferrimagnetism based on organic biradicals with a spin-0 ground state: Numerical calculations of molecule-based ferrimagnetic spin chains", J PHYS CH B, 105(15), 2001, pp. 2932-2938

Abstract

The possibility of a ferrimagnetic spin alignment in a novel type of alternating heterospin chain is examined in terms of a finite-size Heisenberg spin Hamiltonian. One of the two kinds of spin sites in the chain represents an organic molecule with two S = 1/2 spins. The two spins interact antiferromagnetically to give a biradical molecule with a singlet (S = 0) ground state, which is coupled with adjacent S = 1/2 molecules by the intermolecularantiferromagnetic interactions. It is shown that S = 0 is not a good quantum number for describing the biradical embedded in the exchange-coupled chain and that the chain has a ferrimagnetic ground state with S = N/2 (N = the number of repeating units) or a low-spin state of S = 1/2 or S = 0, depending on the ratios of the intra- and intermolecular interactions. An extremely short spin-spin correlation length features in the low-spin state, indicating the occurrence of a quantum mechanical disorder resulting from a frustration effect inherent in the chain. The generalized ferrimagnetic spin alignment proposed in quantum terms uncovers a new category of molecule-based magnetic materials.

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Documento generato il 29/03/20 alle ore 14:47:54