Fig. 6: Magnetic properties of CNS.
From: Synthesis of a magnetic π-extended carbon nanosolenoid with Riemann surfaces
a Room temperature EPR spectra of solid powder and THF solution of CNS. b EPR spectra of THF solution of CNS under dark and illumination for 2 min under 500 W xenon lamp. c, d Low temperature magnetization measurements of a CNS powder sample. c Magnetization for different temperatures (open circles, raw data) and fit of a Brillouin function with a diamagnetic background (solid lines) (field scan rates between 1 and 10 mT/s increase linearly with the applied field). d Sample susceptibility χ as obtained from the magnetic moment in 0.2 T applied field and an estimated sample volume of 2 × 10−9 m3 vs. Reciprocal temperature for scans from 200 K to 1.8 K cool down (1) to 200 K warm up (2) to 1.8 K cool down (3) with rates of 2 K/min (blue), 3 K/min (green), and 6 K/min (red). The kinks in the cool down above 0.4 K−1 are due to the temperature regulation during the approach to 1.8 K and the rise in susceptibility at 1.8 K is due to 200 s relaxation intervals. The inset showed the thermal hysteresis (a magnified area of the black oblong, bottom left) between 150 and 50 K. The black line extrapolates the Curie–Weiss behavior above 150 K to lower temperatures.
