Phys.org October 28, 2024
Researchers in Japan synthesized Fe-doped polyaniline (D-PANI) in which they observed diamagnetism at T < 24 K under a weak external magnetic field. D-PANI was air-stable and showed the Peierls transition, as its resistivity increased rapidly at low temperatures, behaving as an electromagnetic insulator. It showed high sensitivity to magnetic fields, with its diamagnetic character changing under a relatively low magnetic field at 4 K. Its resistivity remained almost constant at high temperatures, and the nearest neighbor electron hopping conduction. Polarons in D-PANI showed perfect diamagnetism at low temperatures. After purification, D-PANI contained C, N, O, S, and Fe but showed no electron spin resonance signal. The synthesized PANI did not exhibit zero resistance. According to the researchers polaron-derived perfect diamagnetism in a conductive polymer is a new magnetic phenomenon… read more. TECHNICAL ARTICLE
Graphical abstract. Credit: The Journal of Physical Chemistry B, Vol 128/Issue 40, 27 September 2024