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Titolo:
Electron paramagnetic resonance and magnetic properties of composite C-60 : Er
Autore:
Shanina, BD; Konchits, AA; Kolesnik, SP; Katsaj, MY;
Indirizzi:
Inst Semicond Phys, UA-252028 Kiev, Ukraine Inst Semicond Phys Kiev Ukraine UA-252028 Phys, UA-252028 Kiev, Ukraine Inst Superhard Mat, UA-254074 Kiev, Ukraine Inst Superhard Mat Kiev Ukraine UA-254074 d Mat, UA-254074 Kiev, Ukraine
Titolo Testata:
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
fascicolo: 1-3, volume: 210, anno: 2000,
pagine: 215 - 224
SICI:
0304-8853(200002)210:1-3<215:EPRAMP>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
FERROMAGNETISM; FULLERITES; FULLERENE;
Keywords:
fullerites; superexchange; magnetic resonance;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
27
Recensione:
Indirizzi per estratti:
Indirizzo: Shanina, BD Inst Semicond Phys, Prospect Nauki 45, UA-252028 Kiev, UkraineInst Semicond Phys Prospect Nauki 45 Kiev Ukraine UA-252028 e
Citazione:
B.D. Shanina et al., "Electron paramagnetic resonance and magnetic properties of composite C-60 : Er", J MAGN MAGN, 210(1-3), 2000, pp. 215-224

Abstract

The composite C-60 : Er was prepared using a mixture of 90 mol% C-60 and 10 mol% Er2O3 powders exposed under compression 8 GPa at temperature T = 1073 K. The anomalous behavior of the EPR signal of paramagnetic centers C-60() at low temperature is revealed. It is expressed through dramatic growth of line width Delta B with a temperature decrease. The resonance field of EPR has a significant anisotropy which also depends on the temperature. Being connected tightly with the shape of the sample, the anisotropy reflects ferromagnetic properties induced by Er3+ ions. The temperature dependence ofsample magnetization is explained in terms of ferromagnetism in disorderedmaterials. Values of the Curie transition temperature T-C and the superexchange interaction of Er3+ ions through C-60 molecules are found equal to T-C = 6.9 K and J(Er-Er) = 19.8 meV, respectively. (C) 2000 Elsevier Science B.V. All rights reserved.

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Documento generato il 20/09/20 alle ore 10:41:29