Three-dimensional ordering, spin excitations, and dilution effects in the quasi-1D ferromagnetic (DMeFc)(TCNE)

Journal Article · Mon Apr 15 04:00:00 EDT 1991 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.347827· OSTI ID:5686208

Narayan, K S; Chi, K M; Epstein, A J ^[1]; Miller, J S ^[2]

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1. Department of Physics, The Ohio State University, Columbus, Ohio 43210-1106 (USA)
2. E. I. du Pont de Nemours and Company, Wilmington, Delaware 19880-0328 (USA)

The linear chain {ital S} =1/2 molecular ferromagnet decamethylferrocenium tetracyanoethanide ((DMeFc)(TCNE)) has been studied by frequency-dependent ac susceptibility experiments. {chi}{prime}({ital T}) and {chi}{double prime}({ital T}) exhibit maxima in the temperature range of 4.8--4.9 K, which corresponds to the transition temperature to the three-dimensional (3D) ferromagnetic ground state. The 3D ordering is due to the presence of a finite interchain ferromagnetic interaction, as determined earlier by dc magnetic susceptibility and specific heat experiments. The results of ac susceptibility measurements below {ital T}{sub {ital c}} are analyzed in terms of a Debye-like model to investigate the presence of gaps in the spin excitation spectrum of the system. Considerable changes are observed in the critical temperature on introducing spinless sites into the system. The transition temperature of the dilution series (DMeFc){sub {ital x}}(DMeCo){sub 1{minus}{ital x}}(TCNE), where (DMeCo){sup +}=(decamethylcobaltocenium{sup +}) has spin {ital S}=0, decreases with increasing (1{minus}{ital x}).

• DOE Contract Number: FG02-86ER45271
• OSTI ID: 5686208
• Journal Information: Journal of Applied Physics; (USA), Journal Name: Journal of Applied Physics; (USA) Vol. 69:8; ISSN 0021-8979; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ANISOTROPY
CRYSTAL MODELS
CYANIDES
FERROMAGNETIC MATERIALS
FREQUENCY DEPENDENCE
HEISENBERG MODEL
MAGNETIC MATERIALS
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MATERIALS
MATHEMATICAL MODELS
ORGANIC COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
SCALING LAWS
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
ULTRALOW TEMPERATURE