Electron spin resonance of alkali-metal-doped fullerenes

Journal Article · Thu Dec 10 04:00:00 EST 1992 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100204a030· OSTI ID:6565110

Bensebaa, F; Xiang, B; Kevan, L ^[1]

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1. Univ. of Houston, TX (United States)

Electron spin resonance (ESR) measurements including spin susceptibility, line width, and g value are given for M[sub 3]C[sub 60] nominal compositions where M is an alkali metal. During about 24 h following the alkali-metal doping, the ESR signal of Rb[sub 3]C[sub 60] is found to be time dependent in the temperature range 4-290 K. At room temperature, the same time dependence is also found in K[sub 3]C[sub 60] and Cs[sub 3]C[sub 60] but not in Na[sub 3]C[sub 60], which is not superconducting. This time dependence of the ESR signal at room temperature appears to correlate with the development of a superconducting phase in K[sub 3]C[sub 60] and Rb[sub 3]C[sub 60] at lower temperature. The ESR line width 24 h after doping scales with the size of the crystal unit cell of M[sub 3]C[sub 60]. For Rb[sub 3]C[sub 60] the temperature dependence of the ESR susceptibility, after 1 day or more, indicates a transition from an antiferromagnetic to a paramagnetic state around the superconducting transition temperature. 30 refs., 5 figs.

• OSTI ID: 6565110
• Journal Information: Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 96:25; ISSN JPCHAX; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360607 -- Other Materials-- Superconducting Properties-- (1992-)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
665100 -- Nuclear Techniques in Condensed Matter Physics -- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALI METAL COMPLEXES
ANTIFERROMAGNETISM
AZIDES
CARBON
CLATHRATES
COMPLEXES
DOPED MATERIALS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRON SPIN RESONANCE
ELEMENTS
FULLERENES
MAGNETIC RESONANCE
MAGNETISM
MATERIALS
NITROGEN COMPOUNDS
NONMETALS
PARAMAGNETISM
PHYSICAL PROPERTIES
RESONANCE
SUPERCONDUCTIVITY
SUPERCONDUCTORS