Author/Authors :
Kuroda، نويسنده , , N. and Sugimoto، نويسنده , , T. and Hagiwara، نويسنده , , M. and Hasanudin and Ueda، نويسنده , , K. and Tada، نويسنده , , T. and Uozaki، نويسنده , , H. and Toyota، نويسنده , , N. and Mogi، نويسنده , , Hiroki I. and Watanabe، نويسنده , , K. and Motokawa، نويسنده , , M.، نويسنده ,
Abstract :
The influence of magnetic field on the crystallization process has been examined in Cs2TCNQ3 (TCNQ=tetracyanoquinodimethane), a strongly Coulomb-correlated organic semiconductor. The crystal structure is unaffected by the magnetic field, while the electric, magnetic and optical properties change markedly if the magnetic field higher than a threshold (∼4 T) is applied during the crystal growth. The high-field crystals exhibit a very weak but distinct spontaneous magnetization with the exceedingly high Curie temperature of ∼420 K. The infrared and visible spectroscopy data show that this novel ferromagnetism concurs with the renormalization of the π∗ state of TCNQ radical anions, TCNQ−.
Keywords :
TCNQ salt , Magnetic field-induced acceptors , Infrared and visible spectroscopy , Organic ferromagnetism
