Large positive magnetoresistance of insulating organic crystals in the non-ohmic region.
We report a large positive magnetoresistance ratio in insulating organic crystals theta-(ET)(2)CsZn(SCN)(4) at low temperatures at which they exhibit highly nonlinear current-voltage characteristics. Despite the nonlinearity, the magnetoresistance ratio is independent of the applied voltage. The magnetoresistance ratio depends little on the magnetic field direction and is described by a simple universal function of mu(B)B/k(B)T, where mu(B) is the Bohr magneton. The positive magnetoresistance may be caused by magnetic-field-induced parallel alignment of spins of mobile and localized electrons, and a resulting blockade of electrical conduction due to the Pauli exclusion principle.
Takahide
Yamaguchi
Y
National Institute for Materials Science, Tsukuba 305-0003, Japan.
Konoike
Takako
T
Enomoto
Kengo
K
Nishimura
Mitsuka
M
Terashima
Taichi
T
Uji
Shinya
S
Yamamoto
Hiroshi M
HM