| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1442932 | Synthetic Metals | 2010 | 4 Pages |
Positive magnetoresistance (MR) has been observed to increase linearly up to 32 T in the magnetically ordered state of organic-based ferrimagnetic semiconductor V(TCNE)x films (x ∼∼2; TCNE = tetracyanoethylene) with TcTc above room temperature (>350>350 K). In this material conductivity takes place via electrons activated from 3d level of V2+ to upper ππ* subband of [TCNE] −−. We show an unusual MR behavior without any sign of saturation up to a magnetic field of 32 T. For temperatures less than TcTc MR exhibits a linear behavior in the entire field range and above TcTc it has a quadratic dependence at low fields. Temperature and field dependent behaviors of MR in this material are explained on the basis of spin polarizations in V2+ 3d level and the upper ππ* subband of [TCNE] −− formed by Coulomb repulsion.
