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Critical exponents at the ferromagnetic transition were measured for thefirst time in an organic ferromagnetic material tetrakis(dimethylamino)ethylenefullerene[60] (TDAE-C$_{60}$). From a complete magnetization-temperature-fielddata set near $T_{c}=16.1\pm 0.05,$ we determine the susceptibility andmagnetization critical exponents $\gamma =1.22\pm 0.02$ and $\beta =0.75 \pm0.03$ respectively, and the field vs. magnetization exponent at $T_{c}$ of$\delta =2.28\pm 0.14$. Hyperscaling is found to be violated by $\Omega \equivd^{\prime}-d \approx -1/4$, suggesting that the onset of ferromagnetism can berelated to percolation of a particular contact configuration of C$_{60}$molecular orientations.Comment: 5 pages, including 3 figures; to appear in Phys. Rev. Let

physical review letters

Critical Exponents at the Ferromagnetic Transition in Tetrakis(dimethylamino)ethylene-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>C</mml:mi></mml:mrow><mml:mrow><mml:mn>60</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>(TDAE-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>C</mml:mi></mml:mrow><mml:mrow><mml:mn>60</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:…

Critical Exponents at the Ferromagnetic Transition in Tetrakis(dimethylamino)ethylene-C60(TDAE-C60