TY - JOUR
T1 - Polymer phase of the tetrakis(dimethylamino)ethylene-C60 organic ferromagnet
AU - Garaj, Slaven
AU - Kambe, Takashi
AU - Forró, László
AU - Sienkiewicz, Andrzej
AU - Fujiwara, Motoyasu
AU - Oshima, Kokichi
PY - 2003
Y1 - 2003
N2 - High-pressure electron spin resonance (ESR) measurements were performed on tetrakis(dimethylamino) ethylene (TDAE)-C60 single crystals and stability of the polymeric phase was established in the P-T 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 a temperature of 520 K, revealing an unexpectedly high thermal stability of the polymer. 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 a temperature of 320 K, which demonstrates that the magnetic properties are profoundly defined by miniscule reorientation of TDAE molecules.
AB - High-pressure electron spin resonance (ESR) measurements were performed on tetrakis(dimethylamino) ethylene (TDAE)-C60 single crystals and stability of the polymeric phase was established in the P-T 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 a temperature of 520 K, revealing an unexpectedly high thermal stability of the polymer. 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 a temperature of 320 K, which demonstrates that the magnetic properties are profoundly defined by miniscule reorientation of TDAE molecules.
UR - http://www.scopus.com/inward/record.url?scp=0344153310&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0344153310&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.68.144430
DO - 10.1103/PhysRevB.68.144430
M3 - Article
AN - SCOPUS:0344153310
VL - 68
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 1098-0121
IS - 14
ER -