3 research outputs found
The polymer phase of the TDAE-C organic ferromagnet
The high-pressure Electron Spin Resonance (ESR) measurements were preformed
on TDAE-C single crystals and stability of the polymeric phase was
established in the parameter space. At 7 kbar the system undergoes a
ferromagnetic to paramagnetic phase transition due to the pressure-induced
polymerization. The polymeric phase remains stable after the pressure release.
The depolymerization of the pressure-induced phase was observed at the
temperature of 520 K. Below room temperature, the polymeric phase behaves as a
simple Curie-type insulator with one unpaired electron spin per chemical
formula. The TDAE donor-related unpaired electron spins, formerly
ESR-silent, become active above the temperature of 320 K and the Curie-Weiss
behavior is re-established.Comment: Submitted to Phys. Rev.