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Titolo:
Evidence for the breakdown of simple classical pictures of organic molecule-based ferrimagnetics: Low-temperature crystal structure and single-crystal ESR studies of an organic heterospin system
Autore:
Nishizawa, M; Shiomi, D; Sato, K; Takui, T; Itoh, K; Sawa, H; Kato, R; Sakurai, H; Izuoka, A; Sugawara, T;
Indirizzi:
Osaka City Univ, Grad Sch Sci, Dept Mat 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 Univ Tokyo, Inst Solid State Phys, Minato Ku, Tokyo 1068666, Japan Univ Tokyo Tokyo Japan 1068666 ate Phys, Minato Ku, Tokyo 1068666, Japan Univ Tokyo, Grad Sch Arts & Sci, Dept Pure & Appl Sci, Meguro Ku, Tokyo 1538902, Japan Univ Tokyo Tokyo Japan 1538902 Appl Sci, Meguro Ku, Tokyo 1538902, Japan
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 3, volume: 104, anno: 2000,
pagine: 503 - 509
SICI:
1520-6106(20000127)104:3<503:EFTBOS>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
NITROPHENYL NITRONYL NITROXIDE; EXCHANGE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
19
Recensione:
Indirizzi per estratti:
Indirizzo: Takui, T Osaka City Univ, Grad Sch Sci, Dept Mat Sci, Sumiyoshi Ku, Osaka 5588585, Japan Osaka City Univ Osaka Japan 5588585 hi Ku, Osaka 5588585, Japan
Citazione:
M. Nishizawa et al., "Evidence for the breakdown of simple classical pictures of organic molecule-based ferrimagnetics: Low-temperature crystal structure and single-crystal ESR studies of an organic heterospin system", J PHYS CH B, 104(3), 2000, pp. 503-509

Abstract

A model compound for purely organic ferrimagnets has been studied by single-crystal cw-ESR spectroscopy. A heterospin system under study is composed of two kinds of nitronylnitroxide molecules with the ground states of S = (1)/(2) and S = 1. These molecules are stacked in an alternating chain in the crystal. The cw-ESR signal of the compound was found to split into two signals below 10 K, which were reproduced by the superposition of two Lorentzian signals. The X-ray measurements at 9.6 K disclosed that the crystal structure remained unchanged at low temperatures, indicating that the origin of the ESR line splitting is not attributable to symmetry reduction associated with structural change but to some change in the spin state: Two distinguishable paramagnetic species are found from the ESR spectra, The appearance of two kinds of paramagnetic species in the alternating chain at finite temperature is expected as a primitive model of thermal excitation in the ferrimagnetic chain which is based on a theoretical calculation. The present experimental results demonstrate that the classical picture of ferrimagnetic spin state (antiparallel alignment of adjacent spins with different spin quantum numbers) is invalidated to describe organic molecule-based exchangecoupled spin systems and overlooks an essential part of the nature of ferrimagnetics.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/09/20 alle ore 03:58:42