Ferromagnetism in a cobaltocene-doped fullerene derivative below 19 K due to unpaired spins only on fullerene molecules

Mrzel, Aleš; Omerzu, A.; Umek, Polona; Mihailović, D.; Jagličić, Zvonko; Trontelj, Z.

doi:10.1016/s0009-2614(98)01184-1

Cited by 52 publications

(31 citation statements)

References 21 publications

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“…The magnetic phenomena do not conform with those of conventional paramagnetism or superparamagnetism (the data do not fit the Brillouin function with S =1/2, and M vs H / T curves do not collapse onto one another). We have observed small hysteresis and remnant magnetization in the M͑H͒ curve of our foam which are usually observed in organic ferromagnets 50 and, hence, do not exclude the case of weak soft ferromagnetism. Nevertheless, we have no clear signs of an ordering temperature.…”

Section: Discussioncontrasting

confidence: 57%

Unconventional magnetism in all-carbon nanofoam

et al. 2004

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We report production of nanostructured magnetic carbon foam by a high-repetition-rate, high-power laser ablation of glassy carbon in Ar atmosphere. A combination of characterization techniques revealed that the system contains both sp 2 and sp 3 bonded carbon atoms. The material is a form of carbon containing graphitelike sheets with hyperbolic curvature, as proposed for "schwarzite." The foam exhibits ferromagnetic-like behavior up to 90 K, with a narrow hysteresis curve and a high saturation magnetization. Such magnetic properties are very unusual for a carbon allotrope. Detailed analysis excludes impurities as the origin of the magnetic signal. We postulate that localized unpaired spins occur because of topological and bonding defects associated with the sheet curvature, and that these spins are stabilized due to the steric protection offered by the convoluted sheets.

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Section: Discussioncontrasting

confidence: 57%

Unconventional magnetism in all-carbon nanofoam

et al. 2004

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“…The susceptibility characteristics of magnetically isolated fulleride spins are important as the point of departure for understanding inter-fulleride spincoupling phenomena, the most interesting cases occurring in [ 16,141,142 There is disagreement over whether the ferromagnetism is solely a property of the fulleride interactions in the TDAE complex, 294,295 but the diamagnetism of the cobalto-…”

Section: Magnetic Susceptibility and Spin Statesmentioning

confidence: 99%

Discrete Fulleride Anions and Fullerenium Cations

2000

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His research interests include reactive cation and superacid chemistry with inert carborane counterions, ionic liquids, bioinorganic chemistry, spin-coupling phenomena, fullerene chemistry, and new carbon-or porphyrin-based materials. He is a Sloan Fellow, a Dreyfus Teacher−Scholar Awardee, and a Guggenheim Fellow. Robert Bolskar received his B.S. degree in Chemistry from Carroll College in Waukesha, WI, in 1992. He earned his Ph.D. degree at the University of Southern California in Los Angeles under the direction of Christopher Reed in 1997, investigating the synthetic redox chemistry of fullerene anions and cations. In 1998 he moved to the University of California, Riverside, as Managing Research Associate. He is currently Senior Chemist at TDA Research in Wheat Ridge, CO. His research interests include the chemistry and physics of fullerene compounds, supramolecular chemistry, strongly oxidizing systems, and electrophilic cations.

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“…It has long been thought that ferromagnetism due to interactions between p-electrons is impossible. However, the discovery of a new organic material (TDAE-C 60 ) rapidly changed this notion [20,21,22] . The ferromagnetic state can be a result solely of the alignment of p-electron spins on the fullerene units.…”

Section: High Pressure Effect On Structural and Electrical Propertiesmentioning

confidence: 99%

The unusual morphology, structure, and magnetic property evolution of glassy carbon upon high pressure treatment

Chen¹,

Wang²,

Liu³

et al. 2003

Braz. J. Phys.

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Glassy carbon (GC) has been high-pressure high-temperature treated. An interesting morphology evolution from the pristine sample to the high pressure products was observed. It is found that GC can be graphitized under pressure at a temperature much lower than that at ambient condition. Furthermore the in − situ structure and electrical measurements of GC and graphitized glassy carbon (GGC) under high temperature and high pressure have been investigated up to 30 GPa. We particularly emphasize the unusual magnetic properties of GC treated under high pressures and high temperatures. A paramagnetic to ferromagnetic-like, and then to superconducting (a diamagnetic signal with hysteresis magnetic response) -like behavior, which can be observed at temperatures as high as 80 K, appears as a successive evolution from the initial GC to GGC in accordance with three regions distinguished by the graphitization temperature. This interesting evolution of magnetic properties probably evokes the new understanding of carbon element.

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Ferromagnetism in a cobaltocene-doped fullerene derivative below 19 K due to unpaired spins only on fullerene molecules

Cited by 52 publications

References 21 publications

Unconventional magnetism in all-carbon nanofoam

Unconventional magnetism in all-carbon nanofoam

Discrete Fulleride Anions and Fullerenium Cations

The unusual morphology, structure, and magnetic property evolution of glassy carbon upon high pressure treatment

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